Featured / Vitamins & Minerals / Evidence B · Moderate
The three most common magnesium forms absorb differently and suit different problems. How to match the form to sleep, constipation, cramps or a plain deficiency, and how much to take.
· 9 min read · 6 sources
Read the reviewStart with the problem, not the product. Each topic collects reviews, ingredient explainers and buying guides.
Every review and ingredient article carries a grade. It rates the human research behind the main claim at the dose actually sold, not the marketing.
Editorial standards| Grade | Label | What it means |
|---|---|---|
| A | Strong | Multiple randomised controlled trials or a meta-analysis in humans, consistent direction, effect at the dose sold. |
| B | Moderate | At least one good randomised trial or several smaller ones; some inconsistency, short duration or population limits. |
| C | Limited | Small or low-quality human studies, or an effect shown only at doses products rarely contain. |
| D | Weak | Animal, cell or observational data only, or human trials that failed to show an effect. |