Supplements & Nutrients (Human)
Start with the question 'do I actually need this?' before the question 'which brand?' Most supplement use happens without baseline testing — meaning people supplement what they think they need rather than what testing would show.
The Health Path
The sequence experts consistently converge on.
Test before you supplement — and only supplement what you actually need
Most supplement use happens without baseline testing. Vitamin D, B12, ferritin (iron stores), magnesium status, and the omega-3 index can be checked through standard labs. Test, correct deficiency if found, retest at 3 to 6 months. Megadose protocols without testing produce a small risk of toxicity and a larger certainty of wasted money. Healthy adults with a varied diet, regular sunlight exposure, and no specific symptoms may have very little to supplement at all. Start with the question 'do I actually need this?' before the question 'which brand?'
Vitamin D — correct deficiency, don't pursue 'optimal' upper-range levels
Vitamin D deficiency is genuinely common — particularly in northern latitudes, in people with limited outdoor exposure, and in darker-s…
Each step in the full Health Path is strengthened by five additional evidence layers:
- Benefits from other Health Areas
- Mistakes to avoid
- Context that changes the advice
- Where experts disagree
- What's changing now
See all 6 steps in order, the reasoning behind each, and how this area connects to every other Health Area.