Our verdict
Pure Encapsulations Magnesium (Glycinate) is one capsule, 120 mg of elemental magnesium, with only a cellulose capsule and ascorbyl palmitate alongside it. That makes small, adjustable doses easy. At $44.60 for 180 capsules from Vitacost it costs about $0.21 per 100 mg. The brand has a strong practitioner reputation, but its product page names no third-party testing for this product, so it sits on tier 3 of our evidence ladder.
Best for: People who want to build their dose one 120 mg capsule at a time, with their clinician.
Check Pure Encapsulations's current price, shipping and return terms on the seller's site.
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Dose, formula and the elemental magnesium calculation
The label lists 120 mg of elemental magnesium as magnesium glycinate per capsule. Other ingredients are a vegetarian capsule (cellulose, water) and ascorbyl palmitate. The brand says the product contains no other forms of magnesium.
The directions allow 1 to 4 capsules daily with food. Four capsules is 480 mg, above the 350 mg adult upper limit for supplemental magnesium, so higher doses should be a clinician's call.
Testing and manufacturing: what has actually been verified?
The brand page lists allergen exclusions and quality language, and says the product is made with vegan ingredients. It does not name third-party testing or link product test results for this item.
That places it on tier 3 of our evidence ladder: brand-level quality information without finished-product results we could check. That is a gap in documentation, not evidence of a quality problem.
Evidence tiers: tier 1 is publicly verifiable, product-specific evidence; tier 2 is product-specific evidence our editors verified privately; tier 3 is manufacturer-level information without finished-product results; tier 4 is unverified. Full definitions.
Price and value: the fair way to compare
| Option | Price | Per serving | Per 100 mg |
|---|---|---|---|
| One-time, 180 capsules | $44.60 | $0.25 | $0.21 |
Pure's practitioner site shows prices only after sign-in, so we used Vitacost's one-time price. A 90-capsule size is also sold. We compare one-time prices on the same date across brands, never a sale price against another brand's list price. Cost per 100 mg is a comparison tool, not a dose recommendation.
Cost per 100 mg across all eight
We may earn a commission from qualifying purchases. Our rating method is independent of compensation.
Customer reviews, reputation and support
Pure's product page showed no reviews, and we didn't capture a retailer review sample, so review evidence carries no weight here yet.
We weigh verified-purchase feedback, sample size, review dates and repeated complaints such as tablet size, stomach upset or shipping delays. We don't treat self-reported sleep changes or a five-star average as clinical evidence.
Claims check
Pure describes the glycinate form as less likely to cause loose stools than other forms. That's plausible, but any form can cause digestive upset at high doses.
Who should consider it, and who might choose an alternative?
Pros
- 120 mg capsule for flexible dosing
- Two-ingredient formula, no other magnesium forms
- About $0.21 per 100 mg
Cons
- No third-party testing named for this product
- Label allows up to 480 mg a day
- Price from a retailer, not the brand
Alternatives worth comparing
Frequently asked questions
How much elemental magnesium does Pure Encapsulations provide?
120 mg of elemental magnesium as magnesium glycinate per capsule.
Is Pure Encapsulations magnesium third-party tested?
We didn't find third-party test results or a certification for this product on the brand page.
Is Pure Encapsulations good for sleep?
No magnesium product has strong evidence for treating insomnia. The small capsule makes it easy to keep doses modest.
Is it the best value?
At about $0.21 per 100 mg it is mid-pack. Its value is flexibility, not the lowest price.
How we reviewed Pure Encapsulations
We reviewed the product page, Supplement Facts, price and any testing documents on November 10, 2026, and compared them with the published human research. We have not lab tested this product ourselves. Rankings follow how we score supplement quality, and the same criteria apply to every brand. Read our affiliate disclosure, magnesium glycinate versus other forms, magnesium glycinate sleep evidence and magnesium for muscle and exercise.
Sources
- pureencapsulationspro.com product page, checked Nov 10, 2026
- NIH Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals.
- Lopresti AL, Smith SJ, Drummond PD. Magnesium Supplementation for Sleep in Adults: A Systematic Review of Randomized Controlled Trials. Journal of Dietary Supplements, 2026.
- Schuster J, Cycelskij I, Lopresti A, Hahn A. Magnesium Bisglycinate Supplementation in Healthy Adults Reporting Poor Sleep: A Randomized, Placebo-Controlled Trial. Nature and Science of Sleep, 2025.
Last source review: November 10, 2026. Next scheduled price check: December 2026. Spot an error? See our corrections policy.