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Key Takeaways Dihexa oral bioavailability ranges from 1022% due to first-pass hepatic metabolism, while injectable subcutaneous delivery achieves 8595% systemic absorption by bypassing the liver entirely

Vitamin D deficiency is common, in part because people who are sick tend to stay at home and not get enough sunshine

Several members of the committee were removed last year and have not yet been replaced

Arch Toxicol

Freezing without a cryoprotectant like glycerol is acceptable for GHK-Cu if single-thaw use is guaranteed, but some researchers add 510% glycerol to the bacteriostatic water during reconstitution specifically to support freeze storage