Collagen is a protein, and if you take it with a large, protein-heavy meal, it has to compete with other amino acids for transport into the bloodstream
But you have to take it quickly
PMID 24127818
Understanding which peptides cross the BBB, and by which route, is essential for anyone evaluating peptide dosing protocols for neurological applications
Matrix Metalloproteinase Regulation GHK-Cu plays a notable role in regulating metalloproteinases (MMPs) and their tissue inhibitors
The multiplex kit was used to quantify the secretions of CRP, Eotaxin, Eotaxin-3, FGF(basic), Flt-1, GM-CSF, ICAM-1, IFN-, IL-10, IL-12/IL-23p40, IL-12p70, IL-13, IL-15, IL-16, IL-17A, IL-17A/F, IL-17B, IL-17C, IL-17D, IL-1RA, IL-1, IL-1, IL-2, IL-21, IL-22, IL-23, IL-27, IL-3, IL-31, IL-4, IL-5, IL-6, IL-7, IL-8, IL-8 (HA), IL-9, IP-10, MCP-1, MCP-4, MDC, MIP-1, MIP-1, MIP-3, PlGF, SAA, TARC, Tie-2, TNF-, TNF-, TSLP, VCAM-1, VEGF-A, VEGF-C and VEGF-D