What are pros and cons of taking Biotin supplement daily?

In my opinion, there are no good studies to support biotin for hair growth or retention. As it is a water soluble vitamin, there is no issue with dosage. Hope this helps. Good luck.

The three elements above are important in hair replication and growth.  Follicular cells do not behave as normal cells do.  Because they have a rapid turnover, they do not undergo normal energy production through Kreb cycle and depend on anaerobic glycolysis to produce their energy.  As such, they are highly dependent on and sensitive to normal multivitamins and specific ones including the ones listed above.Regarding toxicity, biotin is water soluble and will be excreted if in excess through the kidneys.

Biotin probably has very little role for hair growth in most people. Biotin is probably one of the more over utilized supplements for hair growth. There is limited evidence of benefit. It can help nails.