While convenient, storing peptides in plastic syringes can lead to degradation over time as the solution interacts with the plastic and rubber plunger
The medium was changed to a serum-free medium (D6046, Sigma-Aldrich) 48 h after seeding, and sodium selenite (100 nM, S9133, Sigma-Aldrich) was added at the same time for maintaining the expression of GPX3
Even at lower Zepbound doses, results remained impressive
The palmitoyl group of Pal-GHK enhances its ability to penetrate the skin, enabling it to pass into deeper layers of the skin when compared to GHK or GHK-Cu [22]
Locking the backbone into a ring reduces that conformational freedom, so a far larger proportion of molecules present the right shape at any moment, which raises apparent potency without changing the recognition sequence at all
Another tied the peptide to a lack of blood flow to the kidneys