Copper peptides + AHA
Keep them apartKeep them apart. AHAs work at a low pH that destabilizes copper peptides, which prefer near-neutral pH - layered directly they blunt each other.
You don't lose either one: use the acid at one time of day and copper peptides at the other, or alternate days. The ingredients stay in your routine; only the timing changes.
This is an effectiveness clash, not a safety one - nobody's barrier is at risk here, just the money you spent on both products.
Check your own shelf Add the products you actually use - Nitavera flags this pair and 14 others automatically, checks pregnancy, medication and allergy safety, and suggests your AM/PM order. Free, runs in your browser, your photo never uploads. Open the free shelf checker