Mivolis Biotin 5 mg N prevents biotin deficiency. Biotin is of great importance for the organism and is particularly important for the formation of keratin, a key substance for the structure and strength of hair and nails. It also gives the skin a natural freshness and is considered a beauty vitamin due to these positive effects. Biotin deficiency can manifest itself in brittle fingernails, dull hair and flaky skin. Regular intake of biotin can contribute to positive changes in skin, hair and nails and is particularly recommended for: