Shared trust framework
Safety and sourcing
The same boundaries apply across every finder: show the basis, state the limits, and never turn general information into a cure, diagnosis, prescription, or guarantee.
Health and medicine
NSF is educational only. It does not diagnose, treat, cure, or prevent conditions, and it does not tell anyone to stop, reduce, delay, or replace prescribed medicine.
Product claims
Category descriptions do not prove that a particular model has a property. Check the exact formulation, certification, test scope, conditions, and current instructions.
When to pause
Pregnancy, breastfeeding, children, long-term conditions, interactions, severe or worsening symptoms, and urgent concerns need advice appropriate to the individual situation.
Commercial links
Affiliate status is shown on each item. Commercial potential never determines the source signal, safety wording, or whether an item appears.
Source signals
A guide to the source basis, not an effectiveness score
Strong, moderate, limited, and anecdotal describe the quality and relevance of the sources behind the specific information shown. They do not mean that a medicine, product or option is strongly effective, suitable for you, or recommended by NSF.
Source order
- Government, regulator, NHS, recognised standards, and peer-reviewed sources.
- Manufacturer information for exact specifications only.
- Retailers only for basic product facts, never as the sole basis for health claims.