Magnesium ascorbate

MineralBest with a meal

What is it

Magnesium ascorbate is a buffered (non-acidic) form of vitamin C in which ascorbic acid is paired with magnesium; it supplies both nutrients.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Stomach-friendly vitamin C delivery

Limited Evidence

Buffered ascorbate forms reduce gastric irritation compared with ascorbic acid in sensitive users.

How it works

Magnesium ascorbate dissociates in the gut, releasing ascorbate (vitamin C) and magnesium ions. Ascorbate functions as a water-soluble antioxidant and cofactor for collagen synthesis and immune function. Magnesium acts as a cofactor for over 300 enzymes including ATP-dependent reactions. The buffered form is gentler on the stomach than ascorbic acid alone, useful for those with sensitive stomachs. Per gram, it provides about 89% vitamin C and 9% magnesium.

Dosage

Vitamin C RDA: 75 mg (women) / 90 mg (men); UL 2000 mg. Magnesium RDA: 310-420 mg; UL for supplemental magnesium 350 mg. A typical magnesium ascorbate dose of 1000 mg provides 890 mg vitamin C and 90 mg magnesium.

When and how to take it

WHEN: With meals. HOW: Take in divided doses for sustained vitamin C levels.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Magnesium ascorbate powder

Standard buffered form.

Comparable to ascorbic acid for vitamin C absorption.

Safety

Generally well tolerated. Above the vitamin C UL, osmotic diarrhea is common. Magnesium contribution is modest but counts toward daily supplemental magnesium UL.

Who should be cautious

Caution with iron overload, kidney disease (magnesium accumulation), and bisphosphonate therapy.

Interactions

Vitamin C can enhance iron absorption (useful or problematic depending on status). Magnesium may bind tetracyclines and quinolones; separate doses by 2-4 hours.

Food sources

Citrus fruits (vitamin C)

Amount
1 medium
%DV
—

Pumpkin seeds (magnesium)

Amount
1 oz
%DV
—

Frequently asked questions

Is magnesium ascorbate better than ascorbic acid?⌄

Same vitamin C activity; the magnesium pairing reduces stomach acidity. Choose based on tolerance.

References

Magnesium ascorbate on Wikidata — Wikidata link

Magnesium ascorbate on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Magnesium ascorbate (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.