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.
Select all your actives at once. SkinClash scans every possible pair and lists all conflicts in seconds — not just the first match.
Fuzzy search (Fuse.js) with INCI aliases ensures you always select the correct ingredient.
All checks run locally. No data leaves your browser.
🧴 Skincare newbies — Learn what not to mix.
🔬 Routine stackers — Audit your 5+ serum lineup.
🎥 Beauty creators — Answer follower questions instantly.
| Pair | Risk | Why it clashes | Fix | Source |
|---|---|---|---|---|
| Retinol + Glycolic Acid (AHA) | High | Both accelerate cell turnover → over‑exfoliation | 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 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 | 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 → slightly reduced potency | Separate by time if tolerated | J Am Acad Dermatol, 2023 |