I don't know if this helps but I'v always found the upper deltoid far less painful than the thigh
Research overwhelmingly describes the safety of GHK-Cu positively, such as when the authors of a 2018 review called it a safe, inexpensive, extensively studied compound.14 However, even though copper peptides have demonstrated an impressive safety track record in studies, there are (as with most skin care actives) a few safety risks to consider
The peptide works through multiple mechanisms including enhanced angiogenesis (blood vessel formation), increased collagen synthesis, and activation of growth hormone receptors on fibroblasts
~ AlphaMD How TRT Can Help You Think Clearer, Feel Stronger, and Show Up Bigger in Life Most men dont realize how far off theyve drifted mentally, physically, emotionally until they finally feel dialed in again
So far this seems to be working like a dream