B7vitamiinin

B7vitamiinin, also known as biotin, is a water-soluble vitamin belonging to the B-complex group. It plays a crucial role in various metabolic processes within the body. Biotin is essential for the breakdown of carbohydrates, fats, and proteins, aiding in their conversion into energy. It is also involved in the synthesis of fatty acids and amino acids, which are vital for cell growth and function.

The human body does not produce biotin, so it must be obtained through the diet or supplements. Good dietary sources include eggs, nuts, seeds, liver, and sweet potatoes. Biotin is also synthesized by bacteria in the gut, though the extent of its absorption from this source is debated.

Biotin is often associated with hair, skin, and nail health. While deficiency is rare, symptoms can include hair loss, skin rashes, and brittle nails. It is a cofactor for several carboxylase enzymes, which are involved in important biochemical pathways. These enzymes are critical for processes like gluconeogenesis (the production of glucose), fatty acid synthesis, and amino acid metabolism.

Biotin deficiency can be caused by certain medical conditions, prolonged use of anticonvulsant medications, or excessive consumption of raw egg whites, which contain avidin, a protein that binds to biotin and prevents its absorption. While generally considered safe, very high doses of biotin supplements are sometimes used, though scientific evidence for their effectiveness in healthy individuals is limited.