Magnesium Supplements Compared
This comparison looks at label clarity, elemental magnesium disclosure, form transparency, testing status, additives, and price per 100 mg label-stated elemental magnesium across five magnesium product reviews. Default sort reflects SuppCheckr weighted scores — not medical recommendations and not suitability for any specific condition.
Default table order is based on SuppCheckr weighted criteria scores, not a ranking of which product is right for every person or any medical use case. SuppCheckr does not rank magnesium products for sleep, anxiety, constipation, blood pressure, migraines, cognition, or memory. Filter and re-sort by price per 100 mg elemental magnesium or testing status to match your own label and sourcing priorities.
Last updated: 2026-06-30 · Last reviewed: 2026-06-30
How to use this comparison
This table is a label and sourcing tool — not a medical recommendation. Scores summarize dose transparency, form clarity, testing documentation, additives, and dated manual price context using our methodology. They do not determine which product is right for you or suitable for any health condition. Use filters to re-sort by price per active dose or testing status when those criteria matter more to you.
Scores use the magnesium scoring profile (elemental magnesium dose transparency, ingredient/form clarity, label clarity, evidence alignment and claim conservatism, third-party testing documentation, dated price per 100 mg elemental magnesium, formula quality, additives, and brand transparency). Table order defaults to overall score high to low. Narrow criterion labels below each product name reflect specific supported attributes — not broad recommendations or condition-specific winners. Scores are not medical recommendations and do not determine which product is suitable for a specific condition. Consult a qualified healthcare professional before using magnesium supplements, especially if pregnant, nursing, under 18, taking medication, managing kidney disease, or managing a medical condition. See /methodology for weight details.
Read scoring methodology · Magnesium ingredient reference · Buying guide
Comparison caveats
- Klean Athlete Klean Magnesium NSF Certified for Sport status is based on a captured NSF listing for the locked 90-capsule SKU — re-verify before publication. Higher price per 100 mg elemental than budget citrate or oxide options; 120 mg elemental magnesium per capsule is lower than many one-capsule alternatives.
- Nutricost Magnesium Citrate third-party testing remains claimed, not verified with a captured certificate URL for this SKU. Four capsules per serving. Citrate GI tolerance context is general NIH background — not constipation treatment framing.
- NOW Magnesium Malate 1000 mg (SKU 1300) has no verifiable third-party testing captured in Phase 4D-2. Product name refers to magnesium malate compound weight; Supplement Facts list 113 mg elemental magnesium per tablet. SuppCheckr does not cite energy, fatigue, or pain outcomes from brand marketing.
- Pure Encapsulations Magnesium (citrate/malate) Supplement Facts were sourced from a Vitacost retailer listing; official brand-hosted product page for this SKU was not confirmed when originally researched. No per-form elemental magnesium split on the label. Vitacost listed this SKU at $36.50 on 2026-06-29 ($0.17 per 100 mg elemental at cited check). This product occupies the V1 threonate fallback slot — no magnesium L-threonate review is included. Do not repeat cardiovascular or cognitive positioning from retailer copy.
- Nature Made Magnesium Oxide 250 mg has no verified USP or third-party testing documentation. Phase 4G USP Verified product search (2026-06-29) did not list this oxide SKU. Label facts sourced from Target listing. Oxide value uses elemental mg and dated price only — not absorption superiority, GI suitability guarantees, or universal-fit ranking framing. Individual GI tolerance varies.
- No magnesium L-threonate, Life Extension Neuro-Mag, Double Wood Magnesium L-Threonate, Nutricost Magnesium Complex, or other unapproved alternates are included in this comparison.
- Phase 4G price refresh (2026-06-29): Nutricost $13.97, NOW $25.99, Pure Encapsulations Vitacost $36.50, and Nature Made Target $4.49 unchanged. Klean Athlete price ($26.50) not re-checked — brand page returned 403. Verify current price at the retailer before purchase.
| Product | Brand | Score | Price / 100 mg elemental | Price / serving | Testing |
|---|---|---|---|---|---|
Klean Athlete Klean Magnesium (90 Vegetarian Capsules)
| Klean Athlete | SuppCheckr Score81/100 | $0.24 | $0.29 | Verified |
Nutricost Magnesium Citrate Capsules (120 Capsules)
| Nutricost | SuppCheckr Score79/100 | $0.11 | $0.47 | Claimed |
NOW Magnesium Malate 1000 mg Tablets (180 Tablets, SKU 1300)
| NOW Foods | SuppCheckr Score78/100 | $0.13 | $0.14 | Unknown |
Nature Made Magnesium Oxide 250 mg Tablets (100 Tablets)
| Nature Made | SuppCheckr Score77/100 | $0.02 | $0.04 | Unknown |
Pure Encapsulations Magnesium (Citrate/Malate) (180 Capsules)
| Pure Encapsulations | SuppCheckr Score71/100 | $0.17 | $0.20 | Unknown |
Manual dated prices only — not live retailer prices. Last checked 2026-06-29. Check current price at the retailer.
Individual product reviews
Sources
- SuppCheckr scoring methodology — SuppCheckr (internal_editorial)
- Magnesium — Health Professional Fact Sheet — NIH Office of Dietary Supplements (NIH)
- NSF Certified for Sport — Klean Athlete Klean Magnesium — NSF International (certification_body)
- FDA — Dietary Supplements — U.S. Food and Drug Administration (FDA)
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