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Pickart and Margolina's 2018 review cites combined GHK plus LED irradiation increasing fibroblast viability 12.5-fold versus LED alone 1
While the meta-analysis did not identify a single "best" depth, the most commonly studied clinical depth is 1.01.5 mm
But as far as humans go, high-quality studies are still needed to confirm if vitamin B-12 injections can actually contribute to weight gain
It remains effective in water-based serums, emulsions, and gels when stored under recommended conditions (cool, dark environments)
