This question comes up constantly and is usually answered with more confidence than the evidence supports. Here is what the situation actually is.
The claim
The commonly repeated version is that vitamin C and copper peptides should not be used together, on the grounds that they interact and each becomes less effective.
The underlying chemistry is not baseless — interactions between metal-complexed ingredients and reducing agents are a genuine formulation consideration. What does not follow is that applying one product and then another produces a specific outcome on skin.
Why it cannot be settled for these products
Answering this properly for a specific pair of products requires knowing, at minimum:
- The complete composition of both formulas.
- The pH of each.
- Which vitamin C derivative is used, since derivatives behave differently from ascorbic acid.
- How much of each ingredient actually remains on skin after the other is applied.
For the Amplified Glow products, none of the first three is published. The Brightening Vitamin C Serum names its derivative — sodium ascorbyl phosphate — but publishes no concentration and no pH. The copper peptide serums publish a concentration but no full composition and no pH.
The practical option
Separate them by time of day. It sidesteps the question entirely and costs nothing.
Amplified Glow's own directions make this easy: the Brightening Vitamin C Serum is directed for morning use only, and both copper peptide serums are directed morning and evening. Using vitamin C in the morning and a copper peptide serum in the evening follows both sets of instructions and avoids overlap.
| Time | Step | Product type |
|---|---|---|
| Morning | Cleanse | Facial cleanser |
| Morning | Serum | Vitamin C serum |
| Morning | Moisturize | Cream |
| Morning | Protect | Sunscreen |
| Evening | Cleanse | Facial cleanser |
| Evening | Serum | Copper peptide serum |
| Evening | Moisturize | Cream |
One thing worth saying plainly
If you have been using both in the same routine and are happy with how your skin looks and feels, nothing here is a reason to stop. The concern under discussion is about ingredients potentially being less effective, not about harm.