Susceptibility [to absorbing the nutrient] varies, so if you take B6 supplements, you really should have a medical professional check your blood levels to make sure theyre not in excess. A peer-reviewed article provides more information about toxicity
Copper peptide serum comparisons should take hair growth into account
"The importance of folate, vitamins B6 and B12 for the lowering of homocysteine concentrations for patients with recurrent pregnancy loss and MTHFR mutations"
However, vitamin B12 is often very healthy, and there are limited side effects
Erysipelatoclostridium is a member of the Erysipelotrichaceae family, which has been linked to obesity and related metabolic issues 59
Its enhanced stability in topical formulations is also relevant for scalp applications where the product must remain active on the skin surface