DIHEXA has the potential advantage over BDNF itself in that, as a smaller peptide, it may have a better ability to cross the blood-brain barrier, reaching where it is needed
NAD is a coenzyme, not a peptide
While still showing the expected pH dependence for solubility i.e., dependent on the acid and salt solution equilibrium, there is a clear distinction and drop in solubility, dependent on the solid form in equilibrium with the species in solution
But if you cocktail too many products all at once, in an effort to get the most efficient results super quickly, you could be overwhelming your skin instead of giving it the tools to thrive
Moreover, glutathione creams often contain additional ingredients like Vitamin C, which further boosts their effectiveness
doi: 10.3945/ajcn.115.110429 75 ConnellyKJBostonBAPearceENSesserDSnyderDBravermanLEet al