Nutricost

Nutricost Magnesium+ Extra Strength 420mg

Magnesium
Capsule
Magnesium
240

4.5/ 5 on Amazon8,178Amazon ratings5,000+bought last month4.4ProductDome score

More reviewed than 71%

Medium confidenceLast refreshed Aug 4, 2026Amazon data + ProductDome analysis · methodology

Best forYou want a 420 mg magnesium dose that blends oxide and glycinate rather than relying on one form alone.

A four month supply of high-dose, blended-form magnesium for people who want strength and tolerability balanced in one capsule rather than a single-form product.

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ProductDome scorecard

How it ranks among the 108 magnesium we track

4.4/ 5ProductDome scoreMedium confidence

Owner satisfaction · 56% of scorecategory median 4.6★4.5

4.5★ across 8,178 Amazon ratings, Bayesian-smoothed toward the category average.

Evidence strength · 17% of scorecategory median 4,350 ratings4.9

8,178 Amazon ratings, weighted on a log scale so huge counts don't drown everything.

Buyer demand · 11% of score5.0

5,000+ bought on Amazon last month.

Data quality · 11% of score2.5

Brand identity, imagery, description and spec coverage.

The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 108 magnesium we track - how the scorecard works · full magnesium data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.

Overview

Nutricost's Magnesium+ combines magnesium oxide and magnesium glycinate into a single 420 mg extra-strength serving, blending a common high-dose form with a form often chosen for better tolerability.

The 240-capsule bottle is sized for 120 servings at two capsules each, roughly a four month supply at one serving a day. Blending oxide with glycinate is a middle-ground approach, since oxide delivers more elemental magnesium by weight while glycinate is generally gentler on the stomach.

420 mg magnesium per serving from oxide and glycinate
240 capsules, 120 servings, about a four month supply
Non-GMO and gluten free
Vegan-friendly formulation

Who it's for

People wanting a higher 420 mg magnesium dose who are comfortable with a two-capsule serving and a blended oxide-glycinate formula. Less suited to someone who wants a single, purely glycinate-only or citrate-only magnesium product.

Strengths and trade-offs

Drawn from this product's published specifications.

What stands out

420 mg extra-strength dose per two-capsule serving
Blends magnesium oxide with glycinate for a tolerability balance
120 servings, roughly a four month supply
Non-GMO, gluten free, vegan-friendly

What to check first

Two-capsule serving means more pills per dose than a single-capsule product
Blended formula means buyers cannot isolate one magnesium form alone

Performance notes

Magnesium oxide provides a higher percentage of elemental magnesium per milligram but can be harder on the digestive system, while magnesium glycinate is typically better tolerated. Combining the two in one capsule balances dose strength against tolerability rather than choosing one extreme.

Specifications

Brand	Nutricost
Model	NTC-MAG_GLYC-240C
Form	Capsule
Supplement Type	Magnesium
Count	240
Benefits	Digestive Health
Flavor	Unflavored
Diet	Vegan
Allergens	Gluten Free

How it compares

This product against the closest alternatives we track in magnesium.

Product	Amazon rating	Ratings	ProductDome score
Nutricost Magnesium+ Extra Strength 420mgThis product	4.5 / 5	8,178	4.4 / 5
Nature Made Magnesium Oxide 250 mgNATURE	4.7 / 5	34,500	4.6 / 5
NaturalSlim MagicMag Magnesium Citrate Powder for StressNaturalSlim	4.7 / 5	26,700	4.6 / 5
NOW Supplements, Magnesium Citrate, Enzyme Function, Nervous System Support, 120 Veg…Now	4.7 / 5	25,200	4.6 / 5
Life Extension Magnesium CapsLife	4.7 / 5	16,700	4.6 / 5

Frequently asked

Questions about the Nutricost NTC-MAG_GLYC-240C

Common buyer questions answered straight from the product spec data - no fluff, no "it depends".

What forms of magnesium are in Nutricost Magnesium+?

It blends magnesium oxide and magnesium glycinate.

How many capsules make up one serving?

One serving is two capsules, delivering 420 mg of magnesium.

How long does one bottle last?

At 120 servings and one serving a day, the bottle lasts roughly four months.