Natural Vitality · Magnesium · Powder
Is Natural Vitality Calm underdosed?
Verdict
81–325 mg a dayas the label directs · studies use 300 mg a day or more · supplement upper limit 350 mg
Effective doseTaken as the label directs (0.25–1 serving a day, 325 mg each), it gives 81–325 mg a day. Studies of magnesium supplements use 300 mg a day or more; the RDA is 400–420 mg for men and 310–320 mg for women, counting food, and the US upper limit for magnesium from supplements is 350 mg a day.
One serving gives 325 mg, enough on its own for the low end of what studies use (300 mg); it ranks 4th of 21 magnesium supplements here by dose.
What the label says
- Magnesium per serving
- 325 mg in 4 g of powder
- Servings a day
- 0.25–1 serving a day
- Magnesium a day, as directed
- 81–325 mg
- Reference
- studies use 300 mg a day or more · supplement upper limit 350 mg Evidence: Moderate
Recommended use for adults: We suggested starting out with a half teaspoon (1 g) of Natural Vitality CALM powder, and gradually increasing to 2 teaspoons (4 g) daily. Directions: Start by placing the desired amount of powder into a cup or mug, add 2-3 ounces of warm water, and let your drink fizz. Stir the drink until the powder is completely dissolved, then fill the remainder of the cup with warm or cold water. Pour, fizz, mix, drink
More about magnesium: forms, timing and the studies behind the dose.
Same category, compared
All 21 magnesium supplements we checked, ranked by dose (commission never changes the order). Studies use 300 mg a day or more · supplement upper limit 350 mg; servings counted to 300 mg.
| Product | Per serving | Servings to reach it | Form |
|---|---|---|---|
| Country Life Magnesium Glycinate | 350 mg | 1 or less | Tablets · magnesium bisglycinate |
| Solaray High Absorption Magnesium Glycinate 350 mg | 350 mg | 1 or less | Powders · magnesium bisglycinate |
| BioEmblem Triple Magnesium Complex | 300 mg | 1 or less | Capsules · magnesium malate, glycinate, citrate |
| Natural Vitality Calm (this product) | 325 mg | 1 or less | Powders · magnesium carbonate |
| BiOptimizers Magnesium Breakthrough | 500 mg | 1 or less | Capsules · magnesium proprietary blend 1711 mg |
| Bluebonnet Magnesium Citrate | 400 mg | 1 or less | Tablets · magnesium citrate |
| Doctor's Best High Absorption Magnesium 200 mg | 200 mg | 1.5 | Tablets · albion magnesium lysinate glycinate chelate 2000 mg |
| Doctor's Best High Absorption Magnesium Powder | 200 mg | 1.5 | Powders · magnesium lysinate glycinate chelate 2000 mg |
| Nature's Bounty Magnesium 500 mg | 500 mg | 1 or less | Tablets · magnesium oxide |
| NOW Foods Magnesium Citrate | 400 mg | 1 or less | Capsules · magnesium citrate 2667 mg |
| KAL High Absorption Magnesium Glycinate | 315 mg | 1 or less | Capsules · magnesium bisglycinate |
| Nature Made Magnesium 250 mg | 250 mg | 1.2 | Tablets · magnesium oxide |
| Puritan's Pride Magnesium Glycinate | 240 mg | 1.3 | Capsules · magnesium glycinate |
| Nutricost Magnesium Oxide 375 mg | 210 mg | 1.4 | Capsules · magnesium oxide |
| Life Extension Neuro-Mag Magnesium L-Threonate | 144 mg | 2.1 | Capsules · magtein 2000 mg |
| NOW Foods Magtein | 144 mg | 2.1 | Capsules · magtein 2000 mg |
| Sports Research Magnesium L-Threonate | 144 mg | 2.1 | Capsules · magtein 2000 mg |
| Pure Encapsulations Magnesium (Glycinate) | 120 mg | 2.5 | Capsules · magnesium glycinate |
| Thorne Magnesium Glycinate | 120 mg | 2.5 | Capsules · magnesium glycinate |
| Natural Vitality Calm Capsules | 100 mg | 3 | Capsules · magnesium glycinate |
| Double Wood Supplements Magnesium Glycinate 400 mg | 60 mg | 5 | Capsules · magnesium glycinate |
Where the reference doses come from
- Magnesium, 300–350 mg/day: Zhang et al., 2016.
- Label data: National Institutes of Health, Office of Dietary Supplements. Dietary Supplement Label Database, 2026. https://dsld.od.nih.gov/. Label 308256, including its servings a day.
For a supplement taken every day we judge the most the label's directions give in a day, and show the least. Read the full methodology or the corrections log.