Supplements & Nutrients
Most supplements work by filling a gap — not by giving your body something extra. Which is why two people can take the same dose and get completely different results.
Why it matters
Most supplement decisions are made from a label and a hope. The discussions here keep arriving at the same discipline: find out where you actually stand before deciding what to take, then stop once the gap is closed. It is also why the strongest evidence on this page belongs to the two things you can measure — and the weakest to the one you cannot.
Key insights from this synthesis
- Measure first, then decide. All three supplements here point to the same discipline, and the one with no test to measure it is also the one with the weakest evidence.
- Each one has a solid core and a bolder claim attached to it. In every case, the bolder claim is the more exciting one.
- More is not better. Once a shortage is corrected, all three topics say to stop.
- Food and sunlight come first. Supplements are described as filling a gap, never as the starting point.
Draws evidence from 15 expert discussions across 3 topics — 8% of our analysed library.
Synthesised 2026-07-20
Explore the evidenceTopics synthesised from multiple expert discussions.
Topics behind this synthesis
This Health Area is built from 3 topics, each analysed in full. As more evidence is added, it grows.
- Omega-3 Fatty Acids🎧🔒
Supports 13 findings on this page, including Heart health and blood fats · Memory and brain ageing · Gut health
- Vitamin D
Supports 9 findings on this page, including What correcting a real shortage fixes · Autoimmune conditions and cancer · Little midday sun, indoor work, northern winters
- Glycine🎧🔒
Supports 7 findings on this page, including Sleep and cell repair · Eating muscle meat without the rest of the animal · Glycine — why to take it