Most people don't mess up peptides they mess up the math Too strong = side effects Too weak = no results This is how you dose with precision, not guessing. Comment Amazon.com: QUBIT GHK Cu Copper Peptide Supplement for Skin & Hair, Easy to Absorb, Precisely Dosed 90 Vegan Capsules : Health & Household Peptide inhibitors targeting FOXO4 p53 interactions and inducing senescent cancer cell specific apoptosis bioRxiv The FOXO4 peptide in a DRI conformation (D amino acids in a retro reversed sequence), henceforth named FOXO4 DRI, competes with FOXO4 for p53 binding in a dose dependent manner and doing so with higher affinity.