If you are going to distribute a child a biotin supplement, what would be a secure amount?
it would be better for you to ask your Dr this question=good luck
Good luck finding a doctor that has an cultured opinion around nutrition.
As a dietary supplement, the basic serving size on the bottle should be adequate. As with any dietary supplement, it should be a cut of a complete nutritional profile so I hope your child is also receiving a good quality, food-based multivitamin supplement.
Lastly, dietary supplements are intended to supplement, but not substitute, the benefits of a good diet.