Best Magnesium Citrate Supplements 2026: Cost per Effective Dose

By Erin Rose · Updated July 22, 2026 · Methodology · About Us

Top pick for Magnesium Citrate: NOW Magnesium Citrate 200 mg (250 Tablets) — 400mg per 2 tablets (400 mg elemental), $0.20/day. Our best-value pick.

All Magnesium Citrate Supplements Compared

All 3 products sorted by cost per clinically-effective daily dose (lowest first). Dose, certification, and pricing verified against NIH DSLD and manufacturer data.

Magnesium Citrate supplements ranked by cost per effective daily dose. Prices as of July 22, 2026.
Product	Brand	Dose / Serving	Cost / Day	Certification	Pick	Buy
NOW Magnesium Citrate 200 mg (250 Tablets)	NOW Foods	400mg / 2 tablets (400 mg elemental)	$0.20	None	Best Value	Buy
Natural Vitality Calm Magnesium Citrate Powder (16 oz)	Natural Vitality	325mg / 2 tsp (4 g) powder in water	$0.25	None		Buy
Nature Made Magnesium Citrate 250 mg (120 Softgels)	Nature Made	250mg / 2 softgels (250 mg elemental)	$0.43	USP Verified		Buy

Our Picks

Best Value: NOW Magnesium Citrate 200 mg (250 Tablets)

400mg per 2 tablets (400 mg elemental). $0.20/day. 125 servings per container at $24.49.

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How We Rank Magnesium Citrate Supplements

Every product is evaluated on three criteria:

Cost per clinically-effective daily dose. Not cost per pill or cost per bottle. We calculate what it actually costs per day to take the dose used in clinical trials.
Third-party certification. USP Verified, NSF Certified for Sport, and ConsumerLab Approved indicate independent testing for purity, potency, and contaminants.
Bioavailable form. We prioritize products using the specific chemical form shown to be most effective in published research.

Rankings are not influenced by affiliate commissions. We earn the same commission regardless of which product you choose. Read our full methodology.

Personalize Your Magnesium Citrate Choice

Not sure which magnesium citrate supplement is right for you? Use our free tools:

DNA Supplement Analyzer — upload 23andMe or AncestryDNA data to check for genetic variants affecting magnesium citrate metabolism. Runs entirely in your browser.
Lab Results Interpreter — enter your blood test values to get personalized dosing recommendations.
Supplement Stack Builder — build a complete protocol based on your age, sex, medications, and goals.
Supplement Audit — already taking magnesium citrate? Check if you have the right form and dose.