Research, evidence, and sources
What this page is for
We have not established, from the sources reviewed for this page, that a supplement speeds recovery. That is a limit of the evidence we reviewed. It is not a proof that no ingredient could ever matter.
What the reviewed sources say
“Magnesium also plays a role in the active transport of calcium and potassium ions across cell membranes, a process that is important to nerve impulse conduction, muscle contraction, and normal heart rhythm.”
Magnesium plays a role in moving calcium and potassium across cell membranes. The NIH fact sheet says that process matters for muscle contraction, nerve impulses, and a normal heart rhythm. Magnesium also contributes to the structure of bone and is involved in muscle and nerve function.
Early magnesium deficiency can include fatigue, weakness, and later muscle cramps. The fact sheet says symptomatic deficiency is uncommon in healthy people. A role in contraction, and a symptom of deficiency, are not a trial of recovery time, soreness, or return to activity. The fact sheet does not show that a magnesium supplement speeds recovery after exercise.
Magnesium — Health Professional Fact Sheet NIH Office of Dietary Supplements. Updated 2026-01-06. Retrieved 2026-10-07.
How to compare a label
“The nutrition label for a dietary supplement is called a “Supplement Facts” panel.”
Start with the Supplement Facts panel. The FDA’s labeling guide uses that name for a dietary supplement’s nutrition label.
Read the ingredient name, the amount per serving, and the serving size. A blend that lists several ingredients is a different product from a bottle that is only one of them. The price on a retailer card is the package price, not a price per serving, and a sale ribbon is not a checked comparison price.
- Dosage unit converterConvert grams, milligrams, and micrograms. IU converts only when the vitamin form is known.
- Price per servingSee what one serving costs from the container price and the servings on the label.
- Cost per labeled amountSee what a labeled amount of an ingredient costs. A second product is optional.
- Daily nutrient targetsPublished folate, magnesium, and vitamin A figures for a life stage.
Dietary Supplement Labeling Guide: Chapter IV. Nutrition Labeling U.S. Food and Drug Administration. Retrieved 2026-10-05.
Labels you can open
These lists match a published ingredient. Opening one is not a suggestion that the ingredient meets this goal.
Sources
- Magnesium — Health Professional Fact Sheet NIH Office of Dietary Supplements. Updated 2026-01-06. Retrieved 2026-10-07.
- Dietary Supplement Labeling Guide: Chapter IV. Nutrition Labeling U.S. Food and Drug Administration. Retrieved 2026-10-05.