Best Magnesium Citrate
The best magnesium citrate we track, ranked by real cost-per-dose — not paid placements. Across 15 brands, 1 are third-party tested in a public registry.
Updated October 2026prices checked what’s changed
How much does Magnesium Citrate cost?
Magnesium Citrate costs a median $0.18 per serving — the cheapest of the 21 we can price per dose is $0.06 per serving, or $0.03/day to reach the commonly-studied 300 mg dose. Prices checked October 2026.
Ranked across 21 products · prices checked Oct 10, 2026
3rd-party testedNature Made Magnesium Citrate 250 mg per serving
USP Verified brand at $0.13 per serving.
How we rank
We rank by cost-per-dose — price ÷ servings, normalized to the daily dose (300 mg/day) — so bottle sizes and strengths compare fairly. Prices are scraped at publication and re-checked when the catalog refreshes (see the “Prices checked” stamp above). There is no paid placement and no kickback for ordering. Full methodology · Editorial standards.
When cheapest ≠ best value
The cheapest bottle isn’t automatically the best value: a low-absorption form (magnesium oxide is the classic example) can look cheap per milligram yet deliver less of what you actually absorb. Where forms differ, compare cost per absorbed or elemental unit, not the compound weight on the label. A bigger bottle isn’t automatically cheaper per dose either — this list already ranks by cost per dose, so a larger count only wins if it truly costs less per serving. Compare Magnesium Citrate forms.
Our data on this: how much the big bottle saves per serving · the gummy tax · the form premium · the price spread.
Full ranking by cost per dose
Cost-per-serving normalizes price across bottle sizes — a 60-count and a 365-count compare fairly. Top 20 of 21 shown.
- See offer$0.06per serving$0.03 / 300 mg
- See offer$0.06per serving1.1× #1
- See offer$0.08per serving1.4× #1$0.05 / 300 mg
- See offer$0.08per serving1.5× #1
- See offer$0.08per serving1.5× #1$0.06 / 300 mg
- See offer$0.09per serving1.6× #1$0.07 / 300 mg
- See offer$0.10per serving1.7× #1$0.29 / 300 mg
- See offer$0.11per serving2.0× #1$0.33 / 300 mg
- See offer$0.13per serving2.3× #1$0.15 / 300 mg
- See offer$0.17per serving3.0× #1
- See offer$0.18per serving3.3× #1$0.14 / 300 mg
- See offer$0.19per serving3.4× #1$0.23 / 300 mg
- See offer$0.21per serving3.8× #1$0.25 / 300 mg
- See offer$0.21per serving3.8× #1$0.37 / 300 mg
- See offer$0.22per serving4.1× #1$0.17 / 300 mg
- See offer$0.23per serving4.2× #1$0.17 / 300 mg
- See offer$0.26per serving4.7× #1$0.39 / 300 mg
- See offer$0.29per serving5.2× #1$0.17 / 300 mg
- See offer$0.30per serving5.4× #1$0.21 / 300 mg
- See offer$0.35per serving6.3× #1$0.26 / 300 mg
See also: Magnesium Citrate basics · all best-value rankings · magnesium citrate cost-per-dose breakdown
Read: Magnesium Citrate guides
Related comparisons, stacks & nutrients
Magnesium Citrate brands we compare — which are third-party tested?
1 of the 15 brands ranked above appear in an independent certifier's own public registry. A certification confirms the label matches the contents — it says nothing about how well the supplement works, and an uncertified brand is not automatically worse.
Frequently asked
How much does Magnesium Citrate cost?+
The cheapest magnesium citrate we track is $0.06 per serving ($9.99 for 180 servings), against a typical $0.18 per serving across the 21 we can price per dose — about $1.67 a month at the cheapest. That's real cost per dose from live Amazon US prices as of October 2026, not the sticker price.
What is the best-value Magnesium Citrate supplement?+
Vitamatic Magnesium Citrate 500mg per Serving - 180 Vegetarian Capsules… — $0.06 per serving ($9.99 for 180 servings), the lowest cost-per-dose magnesium citrate in our Amazon US catalog as of October 2026.
How much does Magnesium Citrate cost per day?+
The cheapest magnesium citrate we track works out to $0.06 per serving, against a typical $0.18 per serving across the 21 we can price per dose; to reach the commonly-studied 300 mg/day dose the cheapest is $0.03/day. Retailers and review sites list a price and a serving size but rarely divide it out — this is what a day actually costs, as of October 2026.
What is the typical cost per dose for Magnesium Citrate?+
About $0.18 per serving across the 21 magnesium citrate products we can price per dose (combination products are left out — their single label dose belongs to whichever ingredient the product is built around) — the cheapest we track is $0.06 per serving, with most falling between $0.09 and $0.23.
What's the cheapest effective Magnesium Citrate?+
To reach the commonly-studied 300 mg/day dose, Vitamatic Magnesium Citrate 500mg per Serving - 180 Vegetarian… is the best value at $0.03 per day — cheaper than bottles that look low-priced per serving but are underdosed.
What is the highest-quality Magnesium Citrate supplement?+
Of the 15 magnesium citrate brands ranked here, 1 hold a third-party certification we could verify in a public registry: Nature Made (USP Verified). Certification means an independent lab confirmed the label matches the contents and screened for contaminants — it does not rate how well the supplement works. The cheapest certified option is Nature Made Magnesium Citrate 250 mg per serving at $0.13 per serving.
Which Magnesium Citrate brands are third-party tested?+
Nature Made — USP Verified. We only count a brand as tested when it appears in the certifier's own public registry (USP Verified, NSF Certified for Sport, Informed Choice), never on a claim printed on the label. The remaining 14 brands on this page have no certification we could verify.
Which Magnesium Citrate is the top rated?+
We don't republish marketplace star ratings — they belong to the retailer, they move constantly, and a 4.6 average tells you nothing about what is in the capsule. The two things you can verify are what a dose costs and whether an independent lab checked the label. On both counts, Nature Made Magnesium Citrate 250 mg per serving stands out: USP Verified certified at $0.13 per serving.
Independent testing
1 of 15 tracked Magnesium Citrate brands here are flagged as carrying independent third-party testing — a voluntary check of a product's identity, potency and contaminants by an outside lab. It's a quality signal, not a value or efficacy claim. Confirm any brand's current status on the official registries:
Testing status is self-reported by the brand or drawn from public certification and may change — always verify on the official registry before purchase.
References & sources
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.