Our verdict
Transparent Labs offers 300 mg of elemental magnesium in three capsules, with 30 servings for $16.99, or about $0.19 per 100 mg. The product page links a purity report for the finished product and a separate ingredient verification report, which puts it on tier 1 of our evidence ladder. The trade-off is dose: 300 mg sits close to the 350 mg adult upper limit for supplemental magnesium before you count anything else. It was sold out on our check date.
Best for: People who want a larger serving and like reading test reports, and who aren't taking other magnesium.
Check Transparent Labs's current price, shipping and return terms on the seller's site. Status on our check date: sold out.
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Dose, formula and the elemental magnesium calculation
The label lists 300 mg of magnesium as magnesium bisglycinate chelate per three-capsule serving, with 30 servings in a 90-capsule bottle. The product page notes that elemental magnesium is the amount of magnesium itself, and retail listings describe the 300 mg as elemental.
The directions allow up to three capsules daily, so you can take one or two capsules for a 100 or 200 mg dose. More is not automatically better; count multivitamins and other magnesium products toward the 350 mg upper limit.
Testing and manufacturing: what has actually been verified?
The product page links a certificate of analysis for product purity and a separate ingredient verification report, and shows an Informed Choice logo. That places it on tier 1 of our evidence ladder.
Before relying on the reports, check whether they match your bottle's lot and what they test. A product-level purity report is strong evidence, but it may not cover every batch on the shelf.
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, 90 capsules | $16.99 | $0.57 | $0.19 |
The page offered subscribe and save but didn't show the subscription price. The product was marked sold out on our check date, so the price may change when it returns. 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
The product page showed 160 reviews with a star breakdown but no average. From that breakdown the average works out to about 4.8 stars. It is the largest brand-page sample in this comparison, so it carries more weight than most.
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
The page links magnesium to sleep, muscle function and stress. Those reflect magnesium's normal roles; the human evidence for supplements improving sleep or performance is limited. See magnesium for muscle recovery.
Who should consider it, and who might choose an alternative?
Pros
- 300 mg per serving, adjustable down to 100 mg
- Purity and ingredient reports linked on the page
- About $0.19 per 100 mg
- 160 reviews on the brand page
Cons
- Sold out on our check date
- 300 mg is close to the 350 mg upper limit
- Check whether reports match your lot
Alternatives worth comparing
Frequently asked questions
How much elemental magnesium does Transparent Labs provide?
300 mg per three-capsule serving, from magnesium bisglycinate chelate.
Is Transparent Labs magnesium third-party tested?
The product page links a purity certificate of analysis and an ingredient verification report. Check that they match your lot.
Is 300 mg too much?
It is under the 350 mg adult upper limit for supplemental magnesium, but close. Count other supplements, antacids and laxatives, and ask a clinician if you have kidney disease.
Is Transparent Labs the best value?
At about $0.19 per 100 mg it is among the lower-cost options, but it was sold out when we checked.
How we reviewed Transparent Labs
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
- transparentlabs.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.