From my understanding, if I were a doctor I'd want to check on the person's B vitamin levels, particularly biotin. There are metabolic disorders that affect th

From my understanding, if I were a doctor I'd want to check on the person's B vitamin levels, particularly biotin. There are metabolic disorders that affect the body's ability to absorb biotin, and it could be that there's something off with the intestinal bacteria that normally produce the bulk of our needed biotin.