Instantly check for ingredient conflicts backed by CIR, PubMed, and dermatology consensus. No sign‑up, 100% private.
Every conflict rule is linked to published research or regulatory assessments.
All 9 built‑in conflict checks are derived from CIR safety reports, PubMed studies, and EU CosIng restrictions. Each result shows its source.
We follow guidelines from the Egyptian consensus on combining active ingredients safely. No guesswork.
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| Pair | Risk | Why it clashes | Fix | Source |
|---|---|---|---|---|
| Retinol + Glycolic Acid (AHA) | High | Both accelerate cell turnover → over‑exfoliation & barrier damage | Alternate nights | CIR, 2025 |
| Retinol + Salicylic Acid (BHA) | High | Combined exfoliation overloads the epidermis | Separate day/night | J Cosmet Dermatol, 2023 |
| Retinol + Benzoyl Peroxide | High | Benzoyl peroxide oxidizes retinol → both become inactive | Avoid layering | Dermatol Ther, 2022 |
| Vitamin C + Niacinamide | Medium | pH mismatch may form niacin → temporary flushing | Wait 10‑15 min | Int J Dermatol, 2021 |
| Vitamin C + Retinol | Medium | Require different pH environments → mutual irritation risk | AM / PM split | J Clin Aesthet Dermatol, 2022 |
| Copper Peptides + Vitamin C | Medium | Vitamin C oxidizes copper → reduced anti‑aging effect | Alternate AM/PM | Dermatol Surg, 2023 |
| Niacinamide + AHA | Medium | Acidic pH converts niacinamide to niacin → stinging | Apply at different times | Cutis, 2022 |
| AHA + BHA | Medium | Dual acid exfoliation strips the moisture barrier | Choose one per routine | Egyptian expert consensus, 2024 |
| Benzoyl Peroxide + Vitamin C | Low | Mild oxidation may occur → slightly reduced potency | Separate by time if tolerated | J Am Acad Dermatol, 2023 |