Evidence literacy
Mechanism vs. Evidence: Why They Aren't the Same
A supplement can interact with a biological pathway in a way that sounds convincing. That is a starting point for a hypothesis—not proof that the supplement produces a meaningful result for people.
The evidence ladder
- Mechanistic plausibility: a proposed pathway makes biological sense.
- Cell or laboratory work: a controlled model shows an effect.
- Animal evidence: a whole organism shows an effect.
- Human evidence: people receive the intervention under a study design.
- Practical significance: the observed effect is large, consistent, and relevant enough to matter.
Why marketing can blur these levels
Marketing often has to compress complicated research into a short story. The result can make a chain of evidence sound stronger than it actually is. A better habit is to ask exactly what was measured and in whom.
| Statement | What it establishes |
|---|---|
| “Ingredient affects pathway X.” | A biological observation or hypothesis. |
| “Study found a change in marker Y.” | An observed change in a measured variable. |
| “Participants lost Z kg.” | An outcome in that particular study population and design. |
| “This will cause you to lose Z kg.” | A much stronger predictive claim that requires appropriate evidence. |
Use this framework when reading supplement pages
Our Supplement Evidence Explorer gives you a compact way to think through the same questions.