Last updated at 02/09/2026 05:18:35
Natural Factors C Extra 500 mg + Quercetin Bioflavonoids 250 mg (Capsules) 60 Capsules
C Extra + Quercetin Bioflavonoids, 60 Capsules, by Natural Factors
Delivery $12.60
Natural Factors, C Extra + Quercetin, 500 mg/ 250 mg, 60 Easy Swallow Capsules
Delivery $40
Natural Factors Vitamin C Extra + Quercetin - 60 Capsules
Free delivery
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originally posted on iherb.com
These are easy to swallow (the size is smaller) and this a great antioxidant to build one's immunity. The potency is great and there is no after taste. This did not upset my stomach. I take this without food. I really like natural factors as for their quality ingredients. Finding Quercetin with vitamin C is wonderful. Querectin is something that I will take as for medical reports that are very impressive. A great product!
originally posted on iherb.com
Just two quality ingredients, quercetin and vitamin C, a great combo at a good price. We take it for anti-aging and vein and blood vessels support together with Rutin. Most people take quercetin and rutin separately but their effect is compounded when they are taken together. Quercetin and rutin always come together in nature and this is how we take them. Good.
originally posted on iherb.com
Great combination of vitamin C and Quercetin in an all in one easy to swallow capsule. Quercetin is especially hard to find because most manufactures offer their Quercetin in big tablets and capsules that are difficult to swallow. This is the only brand I have found where the capsules are easy to swallow. The added benefits of Vitamin C is even more beneficial for the immune system. Highly recommend. 5 stars
| Serving Size | 1 Capsule |
| Vitamin C (ascorbic acid) | 500 mg |
| Quercetin (bioflavonoids) | 250 mg |
Natural Factors C Extra 500 mg + Quercetin Bioflavonoids 250 mg (Capsules) 60 Capsules
C Extra + Quercetin Bioflavonoids, 60 Capsules, by Natural Factors
Delivery $12.60
Natural Factors, C Extra + Quercetin, 500 mg/ 250 mg, 60 Easy Swallow Capsules
Delivery $40
Natural Factors Vitamin C Extra + Quercetin - 60 Capsules
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
These are easy to swallow (the size is smaller) and this a great antioxidant to build one's immunity. The potency is great and there is no after taste. This did not upset my stomach. I take this without food. I really like natural factors as for their quality ingredients. Finding Quercetin with vitamin C is wonderful. Querectin is something that I will take as for medical reports that are very impressive. A great product!
Just two quality ingredients, quercetin and vitamin C, a great combo at a good price. We take it for anti-aging and vein and blood vessels support together with Rutin. Most people take quercetin and rutin separately but their effect is compounded when they are taken together. Quercetin and rutin always come together in nature and this is how we take them. Good.
Great combination of vitamin C and Quercetin in an all in one easy to swallow capsule. Quercetin is especially hard to find because most manufactures offer their Quercetin in big tablets and capsules that are difficult to swallow. This is the only brand I have found where the capsules are easy to swallow. The added benefits of Vitamin C is even more beneficial for the immune system. Highly recommend. 5 stars
Good product to have. Two products in one tablet, it's so convenient. The pill size is so easy to swallow. It's a good amount of quercetin at 250mg and vitamin C at 500mg in each tablet. Quercetin needs Zince or Vitamin C to be able to absorb better. The price is the best thing about this. However one negative thing is the bottle lid doesn't close as tight as it should. The package design of the bottle probably could improve but it's what on the inside that counts. The quality is good. I make sure I will.order this again when this bottle runs out.
i bought a few bottles to give to my relatives n family. quercetin is one of the best anti oxident, some university researches also prove that it is anti covid, along with many benefits. i also take this to ease allergy reaction. i took this with egcg. so far i feel good and also shed a few pounds. 👍
Preventive supplement to reduce inflammation, strengthen immune system.Quercetin is a flavonoid, a class of antioxidant commonly found in fruits. As I can't possibly consume enough of the foods that have enough quercetin so the easiest and convenient way to increase your intake of quercetin is via a supplement.I use this for boosting immunity, fighting inflammation. I was also happy to read that it may help fight cancer. You need two capsules every day at this dosage, not one.Quercetin can deplete iron, so if you are taking it continuously you might want to check your ferritin levels from time to time.Now I am taking NAC with this every day. Helps keep me healthy!
| Serving Size | 1 Capsule |
| Vitamin C (ascorbic acid) | 500 mg |
| Quercetin (bioflavonoids) | 250 mg |
Natural Factors C Extra + Quercetin 60 Capsules
Description Dietary Supplement. No dairy, starch, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, animal products, salt, tree nuts, or GMOs. Suitable for vegetarians/vegans. Non-GMO. Immune Support. 60 easy swallow capsules. Isura. Mass SPEC. Documentation. Lab tested. Our C Extra + Quercetin contains 500 mg of vitamin C and 250 mg of quercetin. Vitamin C is a powerful C is a powerful antioxidant which supports healthy bones, cartilage, teeth, and gums. It helps protect cells against free radical damage and vitamin C deficiencies in the daily diet, and supports healthy growth. Quercetin is one of the most well-known antioxidant bioflavonoids. A free radical scavenger, quercetin helps around helps support healthy sinus, respiratory, and immune system function. Easy-easy-to swallow capsules as compared to similar size tablets. Manufactured by Natural Factors to ensure safety and potency in accordance with Good Manufacturing Practices (GMP) of the FDA and Health Canada. Contains no artificial colors, preservatives, or sweeteners. Recyclable container and label. (This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.) Product of Canada.
Description Dietary Supplement. No dairy, starch, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, animal products, salt, tree nuts, or GMOs. Suitable for vegetarians/vegans. Non-GMO. Immune Support. 60 easy swallow capsules. Isura. Mass SPEC. Documentation. Lab tested. Our C Extra + Quercetin contains 500 mg of vitamin C and 250 mg of quercetin. Vitamin C is a powerful C is a powerful antioxidant which supports healthy bones, cartilage, teeth, and gums. It helps protect cells against free radical damage and vitamin C deficiencies in the daily diet, and supports healthy growth. Quercetin is one of the most well-known antioxidant bioflavonoids. A free radical scavenger, quercetin helps around helps support healthy sinus, respiratory, and immune system function. Easy-easy-to swallow capsules as compared to similar size tablets. Manufactured by Natural Factors to ensure safety and potency in accordance with Good Manufacturing Practices (GMP) of the FDA and Health Canada. Contains no artificial colors, preservatives, or sweeteners. Recyclable container and label. (This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.) Product of Canada.
Description Dietary Supplement. No dairy, starch, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, animal products, salt, tree nuts, or GMOs. Suitable for vegetarians/vegans. Non-GMO. Immune Support. 60 easy swallow capsules. Isura. Mass SPEC. Documentation. Lab tested. Our C Extra + Quercetin contains 500 mg of vitamin C and 250 mg of quercetin. Vitamin C is a powerful C is a powerful antioxidant which supports healthy bones, cartilage, teeth, and gums. It helps protect cells against free radical damage and vitamin C deficiencies in the daily diet, and supports healthy growth. Quercetin is one of the most well-known antioxidant bioflavonoids. A free radical scavenger, quercetin helps around helps support healthy sinus, respiratory, and immune system function. Easy-easy-to swallow capsules as compared to similar size tablets. Manufactured by Natural Factors to ensure safety and potency in accordance with Good Manufacturing Practices (GMP) of the FDA and Health Canada. Contains no artificial colors, preservatives, or sweeteners. Recyclable container and label. (This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.) Product of Canada.
Description Dietary Supplement. No dairy, starch, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, animal products, salt, tree nuts, or GMOs. Suitable for vegetarians/vegans. Non-GMO. Immune Support. 60 easy swallow capsules. Isura. Mass SPEC. Documentation. Lab tested. Our C Extra + Quercetin contains 500 mg of vitamin C and 250 mg of quercetin. Vitamin C is a powerful C is a powerful antioxidant which supports healthy bones, cartilage, teeth, and gums. It helps protect cells against free radical damage and vitamin C deficiencies in the daily diet, and supports healthy growth. Quercetin is one of the most well-known antioxidant bioflavonoids. A free radical scavenger, quercetin helps around helps support healthy sinus, respiratory, and immune system function. Easy-easy-to swallow capsules as compared to similar size tablets. Manufactured by Natural Factors to ensure safety and potency in accordance with Good Manufacturing Practices (GMP) of the FDA and Health Canada. Contains no artificial colors, preservatives, or sweeteners. Recyclable container and label. (This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.) Product of Canada.
in 4 offers
The lowest price for Natural Factors C Extra + Quercetin 60 Capsules right now is $19.09 at Vitasave.ca, compared across 4 retailers.
The all-time low was $13.97 on 18 Dec 2025 — today's price is 37% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 2 Sept 2026.
