Description General description Biotin is a water-soluble vitamin B which is also known as vitamin B7. It is involved in the synthesis of fatty acids and gluconeogenesis. Biotin is found in plants and animals. Its deficiency causes retardation in growth, alopecia and neurological impairment in humans and animals. Biotin-2′,2′,3′,3′-d4 is an isotope of vitamin B7 wherein C-2′, C-2′, C-3′, C-3′ protons are replaced by deuterium. Application Biotin-2′,2′,3′,3′-d4 can be used as a stable isotope internal standard for accurate data interpretation in specific biological samples.