What Is Clinical Endpoint?

Why It Matters for Supplement Brands

The clinical endpoint determines what kind of claim you can substantiate. If a study measured cortisol levels (a biomarker), you can support claims about cortisol. If it measured self-reported stress (a subjective endpoint), you can support claims about stress perception. Matching your claims to the right endpoints is essential.

How It Works

Clinical endpoints in supplement research fall into several categories:

1. **Biomarker endpoints**: Measurable biological parameters (cortisol, CRP, blood glucose, cholesterol levels). These are objective but may not directly translate to how the person feels. 2. **Subjective endpoints**: Self-reported outcomes using validated questionnaires (PSS for stress, PSQI for sleep quality, VAS for pain). These are clinically relevant but susceptible to placebo effects. 3. **Functional endpoints**: Measurable performance outcomes (muscle strength, VO2 max, cognitive test scores). These bridge biomarkers and patient-reported outcomes. 4. **Composite endpoints**: Combinations of multiple endpoints into a single metric.

Primary endpoints are what the study was powered to detect — they carry the most weight for substantiation. Secondary endpoints are exploratory and carry less evidentiary weight.

Common Mistakes to Avoid

• ✗Making claims about subjective outcomes (e.g., 'reduces stress') based solely on biomarker endpoints (e.g., cortisol reduction)
• ✗Citing statistically significant secondary endpoints when the primary endpoint was not significant
• ✗Not checking whether the endpoint used in the study is validated and clinically accepted
• ✗Confusing surrogate endpoints with clinically meaningful outcomes

Related Terms

See It in Action

Explore how this concept applies to real ingredient substantiation:

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