Folic Acid

Is folic acid supplements safe to give my teen daughter? Her pediatrician told me not too because we can take too much and our body does not shed folic acid, but many beta thal family members take it es especially around cycle time. 
Any suggestions?

It is safe for teens and children, and thals generally need more than non-thals due to the higher production of red blood cells. I absolutely prefer L-methylfolate over the synthetic forms of folate that may not be safe in high doses over an extended period of time.