Symptoms of a biotin deficiency progress gradually over time and can include: Thinning hair or loss of hair Brittle nails A rash around your eyes and mouth Lethargy or depression General advice ...

However, a biotin deficiency is possible. Both Morrow and Di Vincenzo describe some of the warning signs as: Low energy levels (fatigue) Weakened hair and nails Skin rash Numbness and tingling in ...

Some people may experience hives, also known as urticaria, just before or during their period. This is due to hormonal allergies from an increase in progesterone levels during menstruation.

However, a true biotin deficiency is unlikely in those who consume healthy diets. Deficiency symptoms typically manifest as a ...