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That structure, and the brand's own disclosure that compounded medications aren't FDA-approved, are the two things worth sitting with before you get excited about NAD+ or Sermorelin specifically

Published work exists on both forms independently, including studies on copper-free GHK, so a protocol should state which species is intended and control the copper content of the medium accordingly

Over the past 20 years Ive accumulated a lot of information on glutathione, says Vishwanath Venketaraman, Ph.D., a professor of microbiology and immunology at the Western University of Health Sciences who researches glutathione

Products with 1-2% GHK-Cu concentration in stable formulations with appropriate pH and penetration enhancers create stronger improvements more likely persisting after treatment, while lower concentrations (0.1-0.5%) or degraded products may produce subtle temporary effects disappearing quickly upon discontinuation