Vitamin B7 (Biotin)
Vitamin B7 (biotin) is a water-soluble vitamin, important in metabolism as a cofactor for several important carboxylase enzymes. Enzymes dependent on biotin include pyruvate carboxylase, acetyl-CoA carboxylase, and propionyl-CoA carboxylase. Deficiency is rare, but it can be induced by antibiotic usage or excessive consumption of raw egg whites. This is because the avidin in egg whites binds avidly to biotin. Notably, patients with a biotin deficiency may present with dermatitis, diarrhea, and alopecia.