Organisms living in the seas can be a valuable source of substances that show beneficial effects on wellbeing and vitality. Among these is fucoidan (fucoidan) a polysaccharide extracted from algae, such as brown algae, among others. It is combined with many properties and used in the production of dietary supplements, for example those assigned to the Immunity target. An excellent preparation from this category has the renowned brand Doctor's Best in its catalogue.Doctor's Best Fucoidan 70% 300 mg in capsules The dietary supplement Doctor's Best Fucoidan 70% 300 mg contains fucoidan extract (standardised to 70% fucoidan) and is available in the form of vegetarian capsules. The package variant reviewed contains 60 capsules. The product is suitable for those following a vegan and vegetarian diet and those avoiding gluten in their diet. It is also GMO-free. It is advisable to read the information on the product label before starting supplementation.