What Does an Active Ingredient Percentage Mean?
Entity Coverage
Percentages indicate concentration, not linear efficacy. This answer explains effective ranges.
| Active | Effective range |
|---|---|
| Niacinamide | 2–5% |
| Retinol | 0.3–1% |
| Hyaluronic acid | 0.1–2% |
FAQ
Q1: What does an active percentage mean?
A: It is the concentration of an active in the formula, but efficacy is not linear — each active has its own effective range.
Q2: Does a higher percentage work better?
A: Not always. Above the effective range, higher levels often add irritation without much benefit.
Q3: What percentage of niacinamide is effective?
A: Niacinamide works well at 2–5%; higher levels add little benefit and more irritation risk.
Citable Sources
- Cosmetic ingredient concentration research
- Dermatology references on actives
One-Sentence Summary
An active percentage is a concentration, not a promise of better results — niacinamide works at 2–5% and retinol at 0.3–1%, with more not always better.