Ingredient Compatibility Cheat Sheet: 70 Pairs, One Screening Decision
Free tool for formulation teams
Ingredient Compatibility Cheat Sheet: 70 Pairs, One Screening Decision
For formulation teams who need a fast answer before the stability trial.
70 common pairs, rated on a five-level scale, with the mechanism, the practical workaround, and the concentration range that changes the answer.
Download the free A4 PDFA4 landscape · 70 rows · legend + scope note included · no email required
Formulators screen active-ingredient combinations long before a product reaches the lab bench. This cheat sheet turns that screening into a five-minute decision.
It covers the combinations procurement teams ask about most: copper peptides with vitamin C derivatives, niacinamide with acids, AHAs with other AHAs, antioxidants stacked together, and oil-soluble actives paired with water-phase peptides. Every row is a starting hypothesis — not a finished-formula verdict.
How to read the table
| Column | What it tells you |
|---|---|
| Pair | The two actives in the same formula |
| Verdict | ✔ same phase ⚠ separate phase 🔴 concentration-sensitive 🔴 avoid ⚪ neutral |
| Why | The chemical reason (redox, pH, chelation, pKa, solubility) |
| Workaround | The formulation move that changes the answer |
| Window | The use level or pH range where the verdict flips |
Three rules of use
- Check the phase first. A peptide in the water phase and an oil-soluble retinoid in the oil phase can coexist at far higher total actives than either alone. The table’s “separate phase” rows are opportunities, not warnings.
- Watch the pH window. Ascorbic acid, glycolic acid and lactic acid define the acid load. Mandelic acid and PHA are milder because of molecular size and pKa — use the acid that fits the brief, not the one with the loudest claim.
- Treat each peptide as its own program. GHK-Cu, AHK-Cu and palmitoyl peptides do not share a dosage range. GHK-Cu is typically evaluated at 0.05–0.20% in the water phase, added below 40 °C at pH 5.5–6.5; do not transfer that range to AHK-Cu. Free L-ascorbic acid and strong chelators each need a side-by-side screen.
Full conditions: water phase, pH 5.5–6.5, room temperature, no strong chelator unless noted. Change the system, re-run the trial.
Request the grade you actually screened
Every verdict in this table is supported by batch-specific COA, TDS and SDS — the same documents your stability lab will ask for.
For each pair you want to trial, request a sample with the exact grade, purity, CAS and specification used in the screening. For production, request a bulk quotation with MOQ, lead time and Incoterms.
Scope and limitations
This table is a screening starting point, not a release decision.
Values are relative judgments under the stated conditions, drawn from our GHK-Cu formulation guide, the pH, chelator and vitamin C interaction note, GHK-Cu vs AHK-Cu: dosage, evidence and use case, published literature and formulation experience — not product test reports.
It makes no efficacy claim and does not replace a safety or regulatory assessment. Change the concentration, pH, order of addition, packaging, storage or preservative system, and run the accelerated trial again.
Browse actives by mechanism: Cosmetic Active Ingredients · Cosmetic Peptides · Cosmetic Antioxidants · Skin Brightening
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