ghk cu refrigerator Copper Peptide Serum with Niacinamide, Hyaluronic Acid and Mushroom Extract GHK-Cu Dosage and Protocol: A

Oral and injectable routes serve different purposes and use different dose ranges

Two were described publicly

By forming transient nanopores on epithelial cell surfaces, these enhancers have enabled sublingual absorption of proteins up to 150 kDa in animal models, with effects comparable to subcutaneous injection

doi: 10.1007/s10753-013-9660-9

Retinaldehyde is then oxidized to generate retinoic acid in the presence of the aldehyde dehydrogenase 1 (ALDH1) family enzyme, which is then converted into the product 4-oxo retinoic acid

The Akt-eNOS branch of this cascade is also documented in BPC-157 research focused on the nitric oxide system specifically (PMID 23755725)