Vitamin B7, also known as biotin or vitamin H, is essential for the metabolism of carbohydrates and fats. With enough vitamin B7, skin will glow and hair will be healthy. This vitamin promotes the normal health of sweat glands, bone marrow, gonads, blood cells, nerve tissue, skin, and hair.
Functions of Vitamin B7 – Biotin
A deficiency of vitamin B7 can result in disruption in the normal functioning of the central nervous system. It can also lead to various problems of the tissues in and around the mouth. These problems can include cheilosis (cracking of skin around corners of mouth), glossitis (inflammation of tongue), stomatitis (sores in and around mouth), and cracked, painful lips.
Symptoms include hair loss, dry scaly skin, cracking in the corners of the mouth (called cheilitis), swollen and painful tongue that is magenta in color (glossitis), dry eyes, loss of appetite, fatigue, insomnia, and depression. Neurological symptoms of biotin deficiency in adults are depression, lethargy, hallucinations, and numbness or tingling sensations in the extremities.
No toxic side-effects of biotin have been reported in humans at dosages of up to 10 milligrams per day. Just as with the other B vitamins, vitamin H is water soluble, and extra amounts are readily excreted in urine. Even very high dosages which are used to treat problems with hair and nails (2,500 mcg), there have been no reported side effects.