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Orth [12] and Finkey [13] measured uptake of copper into superficial facial skin strata in vivo when applying GHK-Cu for cosmetic purposes, but to date bioavailability of copper was not studied quantitatively using human skin ex vivo

Manufactured to exceed 99% purity and tested using both HPLC and LC-MS protocols, this peptide is supplied in a sterile, sealed vial to ensure stability and integrity

If it has been 4 weeks then that probably is an indication that that is the point at which your B12 levels have dropped again

Optimal storage requires controlled environments between 15-25C with relative humidity below 60%, protection from direct light, and minimal moisture exposure