Question: what are optimal ferritin levels?
Answer: Cotsarelis and Trost say that what most doctors consider to be a normal ferritin level is, in fact, too low. Ferritin levels of 10-15 ng/mL are within the "normal" range. Cotsarelis says a ferritin level of at least 50 ng/mL is needed to help replenish hair. Trost and Bergfeld shoot for 70 ng/mL.