The former generally refers to the biphasic dose-response effects of single, often isolated, bioactive compounds (hormetins), such as resveratrol or curcumin
Wei, P., Han, G., & Wang, Y
This age-dependent concentration differential made GHK-Cu a compound of interest in aging research
These medications work by adjusting appetite, digestion, and blood sugar regulation, so when that support is removed, those systems can shift back quickly
(One honest caveat: a nanomolar concentration in a lab dish is not the same unit as a topical percentage on skin we cite this to show the molecule is potent at low levels, not to claim 0.10% equals that figure.) Copper is potent, and potency cuts both ways
Glutathione is a natural antioxidant produced in the body, but those with sulfur allergies should avoid this treatment 2