Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  maxim, axiom(noun) a saying that is widely accepted on its own merits. 2  axiom(noun) (logic) a proposition that is not susceptible of proof or disproof; its truth is assumed to be self-evident.
A: Biotin, also known as vitamin B7, is a water soluble B vitamin. Biotin is required, by the body, for cell growth, metabolism of fats and amino acids and the production of fatty acids. Biotin helps with numerous metabolic reactions.
Biotin. Biotin is known as the âhair vitaminâ for good reason. It promotes hair growth and prevents brittle, fragile hair. Severe biotin deficiency can lead to loss of hair, eyelashes, and eyebrows. (See 5 Best Biotin Supplements to see which ones rate highest according to reviews.). Vitamin B12. Vitamin B12 is one of the most important vitamins for our hair and a deficiency can result in hair loss and premature graying. A surprising number of people are deficient in B12. Including enough vitamin C and iron in your diet will help you body absorb more B12.