Purpose
Beauty Tool Atlas evidence labels communicate how confidently a claim can be applied to the specific ingredient, product, population and outcome being discussed. They are not medical grades, guarantees or substitutes for individual care.
Strong evidence
Used when multiple relevant, reasonably designed human studies and authoritative guidance support a consistent conclusion for the specific use. Important limitations still appear beside the label.
Moderate evidence
Used when evidence is promising or generally supportive but limited by study size, indirectness, formulation differences, mixed results, risk of bias or incomplete replication.
Limited evidence
Used when evidence relies mainly on small studies, laboratory or mechanistic work, uncontrolled observations, substantial indirectness or inconsistent findings. Marketing claims should remain especially cautious.
Expert consensus
Used for accepted practice supported by relevant professional guidance when randomized trials may be unavailable, impractical or not the central evidence type. The responsible professional body and scope must be named.
Practical guide
Used for low-risk educational organization and technique guidance. It does not mean a product or treatment has been clinically proven.
How a rating is assigned
- Define the exact claim, population, route and outcome.
- Prioritize systematic reviews, controlled human studies, regulators and professional bodies.
- Examine relevance, bias, sample size, comparators and duration.
- Separate ingredient evidence from finished-product evidence.
- Record conflicts of interest and funding.
- Rate conservatively when evidence is indirect or inconsistent.
- Schedule review and change the rating when evidence changes.
What ratings do not mean
A “Strong” label does not mean risk-free, universally effective or appropriate for every reader. A “Limited” label does not prove that a claim is false; it means confidence is currently restricted.