Also called vitamin H, biotin is usually included in most multi-supplements and B-complex formulations. Biotin relieves eczema and dermatitis and helps keep skin healthy.Biotin shows great promise in improving the health of hair, skin and nails.Its role stems primarily from its influence on protein utilisation and fatty acid synthesis.  Signs of biotin deficiency: Eczema, dermatitis, chronic fatigue, muscle cramps, high cholesterol levels.