Carnitine levels and the ability to synthesize carnitine decline as we age [7], which may help explain why energy levels tend to dip and metabolic health tends to decline as we get older, even if all else remains pretty stable
Mild irritation at the injection site (redness, itching)
A one or two week supply mixed fresh and kept cold remains stable long enough for use, though this approach requires more frequent preparation sessions
If your reconstituted TB-500 sits at room temperature for 6 hours because you inject in the evening but forget to refrigerate immediately after, you've lost more potency than a hundred morning-versus-night timing debates could ever recover
Looking for a headline-worthy haul
What the Research Shows GHK-Cu has been documented to stimulate collagen synthesis in dermal fibroblasts at concentrations as low as 1 to 10 nanomolar, modulate matrix metalloproteinase activity to regulate the collagen remodeling cycle, and promote angiogenesis through copper ion-mediated endothelial cell migration (Pickart et al., BioMed Research International, 2015, DOI: 10.1155/2015/648108)