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The parallel decline in endogenous GHK-Cu levels is suggestive, though causation has not been established

The phase two trial, which had 40 patients, was conducted in Croatia, and some people question the validity of the study due to its location, but the groups conducting the trials seem to be doing robust, randomized, control, double-blind, placebo-control trials 2m6s

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In fact, some researchers prefer sterile water specifically because it introduces no additional compounds into the solution