Different brands use different preservatives so this may make a difference to how OK, or not, they are
Methodological caveat: Most human trials use combination formulations published studies often combine GHK-Cu with other actives (e.g., retinoids, vitamin C), making it difficult to isolate GHK-Cus independent contribution
Results develop more gradually than injectable but with maximum convenience
Whether it's an in vitro cell study or an in vivo animal model, the desired outcomelike fat metabolism or NAD+ modulationwill dictate the appropriate concentration and administration schedule
Vermorken, The pathophysiology of elevated vitamin B12 in clinical practice, QJM: An International Journal of Medicine, Volume 106, Issue 6, June 2013, Pages 505515, [Oxford Academic] Roman Pawlak, Scott James Parrott, Sudha Raj, Diana Cullum-Dugan, Debbie Lucus, How prevalent is vitamin B12 deficiency among vegetarians?, Nutrition Reviews, Volume 71, Issue 2, 1 February 2013, Pages 110117, Jatoi S, Hafeez A, Riaz SU, Ali A, Ghauri MI, Zehra M
