All of the B vitamins are water soluble & so cannot be stored in the body. They are easily lost by cooking, storage & the effects of sunlight. Each vitamin is chemically different from the others & all have separate functions in the body. The overall action of the complex is to help maintain health particularly of the nervous system. B vitamins are vital for carbohydrate, fat & protein metabolism & the conversion of food to energy. They help maintain clear eyes, & healthy looking skin & healthy hair. This probably is the reason so many women take a B Complex supplement as part of a nutritional daily beauty care programme. Being water soluble the nutrients are excreted in the urine if too much is taken. A well balanced, good quality formulation is all that's required for the necessary part it can play as a food supplement. The herbal ingredients are from organic, wild crafted (non-threatened species) or cultivated plants & conform to accepted scientific standards, British Pharmacopoeia, European Pharmacopoeia & British Herbal Pharmacopoeia. Bio-Health Vitamin B-Complex Yeast-Free Capsules are free from gluten, corn, wheat, soya & dairy. They do not contain any GM ingredients. Suitable for vegetarians & vegans.