Whichever you choose, read the current certificate of analysis before you buy, and keep everything strictly for laboratory research use, which is the only basis the FDAs drug-approval process leaves open
Biomaterials 33 , 56595671 (2012)
Strong exfoliating scrubs should also be avoided while using glutathione cream, as they can compromise your skin barrier and increase sensitivity
however, the hypertrophic effects of growth hormone have been thought to be primarily mediated via IGF-1
Furthermore, some of the products can be pricey, and many are not suitable for those with certain dietary restrictions, such as vegans or vegetarians
10.1016/0140-6736(91)90350-x Lancet