A brow-and-lash-boosting serum powered by peptides and vegan keratin to accelerate the appearance of fuller, feathery brows and longer, thicker lashes. Featuring a unique two-in-one applicator to maximize both your brows and lashes, this serum creates the perfect environment for hair to thrive with a clean, 97 percent naturally derived, hyaluronic acid-powered formula with vegan keratin and a trio of peptides. It is also ophthalmologist tested, safe for sensitive eyes, and prostaglandin-free. Use it consistently on a daily basis for 12 weeks to see best results.
A brow-and-lash-boosting serum powered by peptides and vegan keratin to accelerate the appearance of fuller, feathery brows and longer, thicker lashes. Featuring a unique two-in-one applicator to maximize both your brows and lashes, this serum creates the perfect environment for hair to thrive with a clean, 97 percent naturally derived, hyaluronic acid-powered formula with vegan keratin and a trio of peptides. It is also ophthalmologist tested, safe for sensitive eyes, and prostaglandin-free. Use it consistently on a daily basis for 12 weeks to see best results.
in 3 offers
The lowest price for Kosas Growpotion Fluffy Lash + Brow Boosting Serum right now is $68.00 at ModeSens, compared across 3 retailers.
The all-time low was $49.34 on 19 Feb 2026 ā today's price is 38% above the lowest ever. It has been notably cheaper before ā worth setting a price alert.
Prices last updated 24 June 2026.
Kosas Growpotion Fluffy Lash + Brow Boosting Serum
A brow-and-lash-boosting serum powered by peptides and vegan keratin to accelerate the appearance of fuller, feathery brows and longer, thicker lashes. Featuring a unique two-in-one applicator to maximize both your brows and lashes, this serum creates the perfect environment for hair to thrive with a clean, 97 percent naturally derived, hyaluronic acid-powered formula with vegan keratin and a trio of peptides. It is also ophthalmologist tested, safe for sensitive eyes, and prostaglandin-free. Use it consistently on a daily basis for 12 weeks to see best results.
A brow-and-lash-boosting serum powered by peptides and vegan keratin to accelerate the appearance of fuller, feathery brows and longer, thicker lashes. Featuring a unique two-in-one applicator to maximize both your brows and lashes, this serum creates the perfect environment for hair to thrive with a clean, 97 percent naturally derived, hyaluronic acid-powered formula with vegan keratin and a trio of peptides. It is also ophthalmologist tested, safe for sensitive eyes, and prostaglandin-free. Use it consistently on a daily basis for 12 weeks to see best results.
Last updated at 24/06/2026 04:28:51
Growpotion Fluffy Lash And Brow Boosting Serum In Default Title
Delivery $51
Kosas GrowPotion Fluffy Lash + Brow Boosting Serum.
Delivery $8
Kosas - GrowPotion Fluffy Lash + Brow Boosting Serum - 3.5mL
Free delivery
originally posted on sephora.com
As a disclaimer, I wasnāt able to provide a before and after picture because I ended up having a reaction to this formula. It made my eyes incredibly itchy (even though I was careful to only get it on the outer part of my lashes). When I tried it on my brows, those became itchy as well, which confirmed that I was having a reaction to the serum. Once I discontinued use, the itching went away. So I couldnāt use this product for the full amount of suggested time to see long lasting results, as others have, but I will still include things that I liked about this product for those who are curious. It is getting only two stars because I cannot see myself buying it again, but it is getting an added star because there were still things I still liked about the product even ...Ā MoreAs a disclaimer, I wasnāt able to provide a before and after picture because I ended up having a reaction to this formula. It made my eyes incredibly itchy (even though I was careful to only get it on the outer part of my lashes). When I tried it on my brows, those became itchy as well, which confirmed that I was having a reaction to the serum. Once I discontinued use, the itching went away. So I couldnāt use this product for the full amount of suggested time to see long lasting results, as others have, but I will still include things that I liked about this product for those who are curious. It is getting only two stars because I cannot see myself buying it again, but it is getting an added star because there were still things I still liked about the product even if it isnāt for me personally.I have been in the beauty retail industry for over six years, and Iāve tried my fair share of lash serums. However, this was the first one to have a doe foot applicator vs a traditional lash spoolie that a lot of other lash serums have to ācoatā the lashes evenly. It was easier to maneuver than I thought it would be. Kudos to whoever thought to try this out for an eye applicator! As a result, applying the serum is quick and easy. Another thing that made this different from others, is the fact that you donāt have to apply it to your lower lashes. When applying it before bed, the formula can transfer to your lower lashes while your eyes are closed, when you are sleeping. Lastly, when waking up in the morning, there were little bits of residue from the serum that could be found on your lashes. It is a good reminder to wash your face. However even when washing it off in the am, my eyes remained itchy throughout the day which is why I stopped using it. The small amount of time I did use this on my brows, it did help fill in sparsely haired areas, so I do believe this product works in the very least as a brow boosting serum!
originally posted on sephora.com
After using the Kosas Grow Potion for about 2 1/2 months I have progressively seen great results. As someone with some sparse spaces of hair growth on my eyebrows and generally short, very light lashes I have tried many products to try to help both of these areas. This serum has a flat teardrop shape and is a soft fuzzy application that allows you to easily apply at the root of the lash but also make it easier to apply product on your eyebrows. As someone who was a teen in the late 90s-early 2000s thin eyebrows were all the rage but unfortunately hard to come back from. I had been able to fill in my brows fairly well the last few years but still struggled with sparse areas. The grow potion has not only helped with regrowth on my eyebrows but also helped to lengthen ...Ā MoreAfter using the Kosas Grow Potion for about 2 1/2 months I have progressively seen great results. As someone with some sparse spaces of hair growth on my eyebrows and generally short, very light lashes I have tried many products to try to help both of these areas. This serum has a flat teardrop shape and is a soft fuzzy application that allows you to easily apply at the root of the lash but also make it easier to apply product on your eyebrows. As someone who was a teen in the late 90s-early 2000s thin eyebrows were all the rage but unfortunately hard to come back from. I had been able to fill in my brows fairly well the last few years but still struggled with sparse areas. The grow potion has not only helped with regrowth on my eyebrows but also helped to lengthen and strengthen my eyelashes. The first benefit I noticed was my lashes looked fuller, and were not breaking easily like previous to using this serum. Within weeks I was starting to see some regrowth in my eyebrows and shortly following the lengthening of my lashes. After 2 1/2 months my eyelashes look like new lashes. Longer, fuller, stronger and for the first time in my life only need a small amount of mascara to actually make my eyes look more open and refreshed. One thing that really stood out to me about this product is that it is the first one I have tried that has not bothered my sensitive eyes AT ALL. This is a huge win for me!As a licensed cosmetologist for 18 years I highly recommend this grow potion to anyone who has been searching for a product that is filled with safe, beneficial ingredients to boost your lashes and eye brow growth. I think those with sensitive eyes and Iāll especially be pleasantly surprised with this serum.
originally posted on sephora.com
Before I lost all my hair including my lashes and eyebrows due to chemotherapy and hormonal treatment, they havenāt grown back quite the same. However, they donāt grow back thick, long, or full like they did before. As a beauty expert reviewer, I am consistently in search of good, clean beauty products to enhance my natural beauty (as there are days, I donāt feel like putting on makeup, especially during the summertime). So, that goes for my brows and lashes, too! I have tried several different brands and they seem to not work until I got to try this brand. It has strengthened my hair (or a little bit I have) to keep them from always falling out.So, after a month of applying this nightly treatment to my lashes and brows, I noticed that my lashes began to grow a ...Ā MoreBefore I lost all my hair including my lashes and eyebrows due to chemotherapy and hormonal treatment, they havenāt grown back quite the same. However, they donāt grow back thick, long, or full like they did before. As a beauty expert reviewer, I am consistently in search of good, clean beauty products to enhance my natural beauty (as there are days, I donāt feel like putting on makeup, especially during the summertime). So, that goes for my brows and lashes, too! I have tried several different brands and they seem to not work until I got to try this brand. It has strengthened my hair (or a little bit I have) to keep them from always falling out.So, after a month of applying this nightly treatment to my lashes and brows, I noticed that my lashes began to grow a little bit longer and my brows had a bit more density with less hair fallout. I have to say that I am more confident to walk out of the house without having to put on brow gel and mascara. I have been enjoying this supernatural 2-in-1 serum as it contains vegan keratin, hyaluronic acid, pro-vitamin B5 plus a trio of peptides to help condition and hydrate, yet it has no scent, or side effects, and is great for sensitive eyes.Therefore, I highly suggest this product for individuals that are not gifted with naturally feathery brows or long, thick lashes in need of collagen-boosting peptides to help build up the proteins in oneās hair follicles. This product accelerates the growth process---give it at least a month to start to see results, but results will vary by the individual to noticeably see lushness sheen and longer lash appearance.
Growpotion Fluffy Lash And Brow Boosting Serum In Default Title
Delivery $51
Kosas GrowPotion Fluffy Lash + Brow Boosting Serum.
Delivery $8
Kosas - GrowPotion Fluffy Lash + Brow Boosting Serum - 3.5mL
Free delivery
As a disclaimer, I wasnāt able to provide a before and after picture because I ended up having a reaction to this formula. It made my eyes incredibly itchy (even though I was careful to only get it on the outer part of my lashes). When I tried it on my brows, those became itchy as well, which confirmed that I was having a reaction to the serum. Once I discontinued use, the itching went away. So I couldnāt use this product for the full amount of suggested time to see long lasting results, as others have, but I will still include things that I liked about this product for those who are curious. It is getting only two stars because I cannot see myself buying it again, but it is getting an added star because there were still things I still liked about the product even ...Ā MoreAs a disclaimer, I wasnāt able to provide a before and after picture because I ended up having a reaction to this formula. It made my eyes incredibly itchy (even though I was careful to only get it on the outer part of my lashes). When I tried it on my brows, those became itchy as well, which confirmed that I was having a reaction to the serum. Once I discontinued use, the itching went away. So I couldnāt use this product for the full amount of suggested time to see long lasting results, as others have, but I will still include things that I liked about this product for those who are curious. It is getting only two stars because I cannot see myself buying it again, but it is getting an added star because there were still things I still liked about the product even if it isnāt for me personally.I have been in the beauty retail industry for over six years, and Iāve tried my fair share of lash serums. However, this was the first one to have a doe foot applicator vs a traditional lash spoolie that a lot of other lash serums have to ācoatā the lashes evenly. It was easier to maneuver than I thought it would be. Kudos to whoever thought to try this out for an eye applicator! As a result, applying the serum is quick and easy. Another thing that made this different from others, is the fact that you donāt have to apply it to your lower lashes. When applying it before bed, the formula can transfer to your lower lashes while your eyes are closed, when you are sleeping. Lastly, when waking up in the morning, there were little bits of residue from the serum that could be found on your lashes. It is a good reminder to wash your face. However even when washing it off in the am, my eyes remained itchy throughout the day which is why I stopped using it. The small amount of time I did use this on my brows, it did help fill in sparsely haired areas, so I do believe this product works in the very least as a brow boosting serum!
After using the Kosas Grow Potion for about 2 1/2 months I have progressively seen great results. As someone with some sparse spaces of hair growth on my eyebrows and generally short, very light lashes I have tried many products to try to help both of these areas. This serum has a flat teardrop shape and is a soft fuzzy application that allows you to easily apply at the root of the lash but also make it easier to apply product on your eyebrows. As someone who was a teen in the late 90s-early 2000s thin eyebrows were all the rage but unfortunately hard to come back from. I had been able to fill in my brows fairly well the last few years but still struggled with sparse areas. The grow potion has not only helped with regrowth on my eyebrows but also helped to lengthen ...Ā MoreAfter using the Kosas Grow Potion for about 2 1/2 months I have progressively seen great results. As someone with some sparse spaces of hair growth on my eyebrows and generally short, very light lashes I have tried many products to try to help both of these areas. This serum has a flat teardrop shape and is a soft fuzzy application that allows you to easily apply at the root of the lash but also make it easier to apply product on your eyebrows. As someone who was a teen in the late 90s-early 2000s thin eyebrows were all the rage but unfortunately hard to come back from. I had been able to fill in my brows fairly well the last few years but still struggled with sparse areas. The grow potion has not only helped with regrowth on my eyebrows but also helped to lengthen and strengthen my eyelashes. The first benefit I noticed was my lashes looked fuller, and were not breaking easily like previous to using this serum. Within weeks I was starting to see some regrowth in my eyebrows and shortly following the lengthening of my lashes. After 2 1/2 months my eyelashes look like new lashes. Longer, fuller, stronger and for the first time in my life only need a small amount of mascara to actually make my eyes look more open and refreshed. One thing that really stood out to me about this product is that it is the first one I have tried that has not bothered my sensitive eyes AT ALL. This is a huge win for me!As a licensed cosmetologist for 18 years I highly recommend this grow potion to anyone who has been searching for a product that is filled with safe, beneficial ingredients to boost your lashes and eye brow growth. I think those with sensitive eyes and Iāll especially be pleasantly surprised with this serum.
Before I lost all my hair including my lashes and eyebrows due to chemotherapy and hormonal treatment, they havenāt grown back quite the same. However, they donāt grow back thick, long, or full like they did before. As a beauty expert reviewer, I am consistently in search of good, clean beauty products to enhance my natural beauty (as there are days, I donāt feel like putting on makeup, especially during the summertime). So, that goes for my brows and lashes, too! I have tried several different brands and they seem to not work until I got to try this brand. It has strengthened my hair (or a little bit I have) to keep them from always falling out.So, after a month of applying this nightly treatment to my lashes and brows, I noticed that my lashes began to grow a ...Ā MoreBefore I lost all my hair including my lashes and eyebrows due to chemotherapy and hormonal treatment, they havenāt grown back quite the same. However, they donāt grow back thick, long, or full like they did before. As a beauty expert reviewer, I am consistently in search of good, clean beauty products to enhance my natural beauty (as there are days, I donāt feel like putting on makeup, especially during the summertime). So, that goes for my brows and lashes, too! I have tried several different brands and they seem to not work until I got to try this brand. It has strengthened my hair (or a little bit I have) to keep them from always falling out.So, after a month of applying this nightly treatment to my lashes and brows, I noticed that my lashes began to grow a little bit longer and my brows had a bit more density with less hair fallout. I have to say that I am more confident to walk out of the house without having to put on brow gel and mascara. I have been enjoying this supernatural 2-in-1 serum as it contains vegan keratin, hyaluronic acid, pro-vitamin B5 plus a trio of peptides to help condition and hydrate, yet it has no scent, or side effects, and is great for sensitive eyes.Therefore, I highly suggest this product for individuals that are not gifted with naturally feathery brows or long, thick lashes in need of collagen-boosting peptides to help build up the proteins in oneās hair follicles. This product accelerates the growth process---give it at least a month to start to see results, but results will vary by the individual to noticeably see lushness sheen and longer lash appearance.
As an Esthetician, I have tried several lash and brow boosting products. I was excited to try this one from Kosas because using clean and safe products is very important to me. I also choose not to use lash products that can cause any sort of darkening or side effects. This serum contains strengthening amino acids and peptides to stimulate new growth. I love that I can use it on both brows and lashes and that it is gentle. I do not have any irritation from using this. There isn't a noticable scent and the applicator is soft and easy to use. My only minor complaint about the application, is it can leave a small amount of residue that can flake or peel if you rub or put makeup on over it. I recommend using very sparingly during the day and as a last step in your ...Ā MoreAs an Esthetician, I have tried several lash and brow boosting products. I was excited to try this one from Kosas because using clean and safe products is very important to me. I also choose not to use lash products that can cause any sort of darkening or side effects. This serum contains strengthening amino acids and peptides to stimulate new growth. I love that I can use it on both brows and lashes and that it is gentle. I do not have any irritation from using this. There isn't a noticable scent and the applicator is soft and easy to use. My only minor complaint about the application, is it can leave a small amount of residue that can flake or peel if you rub or put makeup on over it. I recommend using very sparingly during the day and as a last step in your routine. I have been using the serum for over 6 weeks. So far, I am noticing my lashes are stronger and shedding less. I notice some slight filling out in the brow area and I believe slightly longer lashes, although it is not noticable yet. Kosas claims that results are more apparent after 8+ weeks of use, so I haven't given it enough time to see the full result. Also, I've used lash products pretty consistently in the past, so my lashes are starting off in good condition. Overall, I would recommend this product, especially if natural formulations are important to you. I wouldn't expect any dramatic results and you have to be consistent to get results at all. If this fits the bill for you, give this great product a try!
Kosas never lets you down when it comes to eye catching packaging. It has always been on point and fun! Their Grow Potion Fluffy Brow + Lash Boosting Serum is an enhancing serum packed with Hyaluronic Acid, Tri Peptides, vegan keratin, pro- Vitamin B5 which are all powerful ingredients to promote hair growth. This beauty of this product can be used to target sparse brows or lashes, however it is recommended to use it on one area. As a licensed professional for multiple years now, I have also been an avid user of lash growth serums since high school to try and enhance my naturally thin and straight lashes, and am now in my mid-twenties. With this formula, it has a thicker viscosity and is fragrance free. I accidentally jabbed the brush applicator to the side of my ...Ā MoreKosas never lets you down when it comes to eye catching packaging. It has always been on point and fun! Their Grow Potion Fluffy Brow + Lash Boosting Serum is an enhancing serum packed with Hyaluronic Acid, Tri Peptides, vegan keratin, pro- Vitamin B5 which are all powerful ingredients to promote hair growth. This beauty of this product can be used to target sparse brows or lashes, however it is recommended to use it on one area. As a licensed professional for multiple years now, I have also been an avid user of lash growth serums since high school to try and enhance my naturally thin and straight lashes, and am now in my mid-twenties. With this formula, it has a thicker viscosity and is fragrance free. I accidentally jabbed the brush applicator to the side of my eye when applying the product and I am so relieved to say that it did not burn at all! The Brush applicator might be my favorite eyelash serum applicator to date compared to a spoolie brush or the straight brushes similar to lip lining ones. The shape helps to hug my lashes and spread the formula evenly, just be sure to not have an excess amount of product on the tip before applying. The Grow Potion is best applied NIGHTLY on clean lashes so the serum can be absorbed overnight and you get the full potential for better results. It is now part of my after shower ritual and the brush applicator might be my favorite eyelash serum applicator to date. The shape helps to hug my lashes and spread the formula evenly, just be sure to not have an excess amount of product on the tip before applying. As for results, I do see that my eyelashes are longer but not thicker after two months of using the product. I would like to say that there is a VERY noticeable difference in my lashes when I curl and apply a couple coats of my favorite mascara.
I have been working in the skin and beauty industry for 13+ years and enjoy products that are easy and comfortable for everyday use. I love that Kosas is a squeaky clean cosmetic and make-up brand, the products are comfortable to wear and that the products contain beneficial ingredients that are clinically proven.I have very stubborn, short and straight lashes and was hoping to get even a little bit of an improvement. After 9 weeks of daily use, I will admit the 5th week I was a little slack, therefore the extra week, I did notice my lashes appeared to be thicker and a little longer (see Before & After pictures). This is the first time that I have stuck to applying a lash growth serum, as consistency is key, so I can't compare it to previous results. The product ...Ā MoreI have been working in the skin and beauty industry for 13+ years and enjoy products that are easy and comfortable for everyday use. I love that Kosas is a squeaky clean cosmetic and make-up brand, the products are comfortable to wear and that the products contain beneficial ingredients that are clinically proven.I have very stubborn, short and straight lashes and was hoping to get even a little bit of an improvement. After 9 weeks of daily use, I will admit the 5th week I was a little slack, therefore the extra week, I did notice my lashes appeared to be thicker and a little longer (see Before & After pictures). This is the first time that I have stuck to applying a lash growth serum, as consistency is key, so I can't compare it to previous results. The product is easy to apply and does not cause any sensitivity of the surrounding skin or eyes, probably as it is dermatologically tested. I did use the side of the applicator head, cleaned the paddle side which saved the product too, to have a better precision and smaller surface area to get to the base of my upper lashes. There is no need to apply to the bottom lashes, as the serum will naturally transfer with blinking, plus I can see that the bottom lashes are longer too. The 3.5mls goes a long way and I think I have more than half of the container left, which will support my maintenance and extra growth journey. If you do tend to get excess product on your lashes it will leave a residue which is easily wiped off the next morning with water. A great alternative to other lash/brow enhancing products out there due to the naturally derived, clinically proven ingredients and that it is free of harmful and toxic ingredients.
I had so much fun using this amazing eyelash and eyebrow GrowPotion by Kosas over the past three months! As a Beauty Expert for Beautytap, Iāve had the pleasure of trying the Kosas Plump + Juicy Lip Plumper, Kosas Wet Lip Oil and the Kosas Clear Air Brow Treatment Gel. The Kosas GrowPotion Fluffy Brow + Lash Boosting Serum is another winner for me! I canāt get over how much I love Kosas and their quality Vegan and Cruelty Free products. Kosas GrowPotion has a nice, light botanical garden scent. It has a lightweight, smooth gel texture. GrowPotion has a beautiful, sexy and fun tube and a unique wand designed with a pointed tip to apply the potion on the base of the lashes and a long flat side to apply on the brows. A little goes a long way with this magical potion. I ...Ā MoreI had so much fun using this amazing eyelash and eyebrow GrowPotion by Kosas over the past three months! As a Beauty Expert for Beautytap, Iāve had the pleasure of trying the Kosas Plump + Juicy Lip Plumper, Kosas Wet Lip Oil and the Kosas Clear Air Brow Treatment Gel. The Kosas GrowPotion Fluffy Brow + Lash Boosting Serum is another winner for me! I canāt get over how much I love Kosas and their quality Vegan and Cruelty Free products. Kosas GrowPotion has a nice, light botanical garden scent. It has a lightweight, smooth gel texture. GrowPotion has a beautiful, sexy and fun tube and a unique wand designed with a pointed tip to apply the potion on the base of the lashes and a long flat side to apply on the brows. A little goes a long way with this magical potion. I used this potion on both my eyebrows and my eyelashes. This potion hydrates and conditions to add a beautiful sheen and lushness to your brows and lashes. I even used this as a way to cool down before I went bed each night, especially on those hot summer nights. This GrowPotion is formulated with amazing ingredients to help your brows and lashes thrive. A trio of peptides help promote the appearance of length and thickness. Biotinoyl Tripeptide 1 supports healthier and fuller lashes and brows. Myristoyl Pentapeptide-17 helps create a prime environment for Keratin. Acetyl Tetrapeptide 3 activates 3 levels of hair optimization-hair density, length and strength. Vegan Keratin is a blend of 18 Amino Acids that deliver the essential building blocks of healthy and fortified hair. Provitamin B5 helps promote smooth and shiny hair. Hyaluronic Acid hydrates and conditions dry, brittle or damaged hair to help reduce hair breakage. The more I used this Grow Potion, the more my lashes began to look so beautiful naturally without mascara. Itās like the amazing Kosas Grow Potion put a spell on my lashes and brows to help them grow. I see the biggest difference in my lashes. They look fuller, darker and healthier. M
One of Kosasā core pillars has resonated with me from the moment I was introduced to the brand: being comfortable in your own skin. As a professional beauty writer for 13+ years, Iāve tried to see myself through my own lens. My brows and lashes, however, are nearly non-existent thanks to aging, but I had a very good experience with the Kosas GrowPotion and plan to keep using it for a full six months to see if it continues to make me less self-conscious about my skimpy little brows and lashes. Hereās why:I Saw New Brow Growth in Six Weeks: Seeing results in less than 12 weeks was surprising. I took ābeforeā pictures with and without mascara for accuracy and began noticing new brow hairs in previously bald places within the first four weeks. My lashes didnāt really ...Ā MoreOne of Kosasā core pillars has resonated with me from the moment I was introduced to the brand: being comfortable in your own skin. As a professional beauty writer for 13+ years, Iāve tried to see myself through my own lens. My brows and lashes, however, are nearly non-existent thanks to aging, but I had a very good experience with the Kosas GrowPotion and plan to keep using it for a full six months to see if it continues to make me less self-conscious about my skimpy little brows and lashes. Hereās why:I Saw New Brow Growth in Six Weeks: Seeing results in less than 12 weeks was surprising. I took ābeforeā pictures with and without mascara for accuracy and began noticing new brow hairs in previously bald places within the first four weeks. My lashes didnāt really look fuller, longer, or darker to the naked eye, but the proof is in the āafterā pictures. There are clearly more lashes today than there were six weeks ago.Consistency Isnāt Hard to Achieve ā Years ago, I used Latisse but hated having to remove my contacts every night before applying it. The inconvenience was off-putting. Not so with Kosas. I simply wash my face, apply the serum to both brows and upper lash lines, and finish my nightly routine.Applicator Needs a Companion Spoolie ā For years, Iāve applied castor oil to my lashes with a disposable mascara wand, and I consistently brushed through my brows and lashes after applying the Kosas serum nightly. I felt like I got better coverage without wasting serum by doing it this way. When I used the applicator by itself, I awoke to tiny flakes of excess dried product on my brows. Using the disposable brush eliminated that completely.Closing Thoughts: This is not a miracle product by any stretch, but it didnāt irritate my eyes, was easy to use nightly, and has given me positive results in a short time, so Iām a fan.