Solgar Biotin 5000iu contains high levels of biotin which is a water soluble B vitamin which has metabolic functions. This allows it to work as a co-factor which allows many enzymes to work efficiently. Taking biotin can have many cosmetic benefits as it may help to promote healthy hair, scalp, skin and nails. It is also well known for its ability to improve the condition of your hair. Biotin can also contribute to regular functioning of the nervous system as well as normal psychological functioning. This product is free from: Gluten, wheat, dairy, soya, yeast, preservatives, sweeteners, artificial flavours or colours. It is suitable for vegans, vegetarians and those following a kosher diet.