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For someone mainly interested in skin tightening, tissue repair, or age-related skin changes, GHK-Cu is generally the more extensively researched of the two

Note: Brightening from a rinse-off product accumulates over months rather than weeks, so this is a slow, steady contribution to tone rather than a visible change by a fortnight in

Its plasma concentration decreases with age (200 ng/mL at age 20 vs

Sagara et al., 1996)

They do not establish the efficacy of a 400 mcg SubQ dose in GLOW, and their findings cannot be assigned to a TB-500 fragment vial. Regulatory Status GLOW as a pre-mixed blend has not been evaluated by the FDA