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However, it may also affect other parts of your body, like your legs, neck or arms

Angiogenesis promotes formation of new blood vessels, improving blood flow and oxygen delivery

Second, as an observational study, causality cannot be established, and the findings remain susceptible to residual confounding from unmeasured factors, including confounding by indication, disease severity, prescribing preferences, and lifestyle factors such as diet, physical activity, or cognitive engagement

Celikel T, Szostak VA, Feldman DE (2004)

Where the Risk Is Highest Consumers who currently obtain BPC-157, TB-500, and MOTS-C through online sellers that market them as "for research use only" or "not for human consumption" are already taking an uncharacterized risk, since those products are not manufactured under pharmaceutical-grade conditions and are not subject to purity or potency standards

In fact, GHK seems to actually block lethal ultraviolet radiation damage and protect the skin, per a 2014 study