The Claim

Ingestion of 1200 mg/day of malic acid for 7 days in eight healthy adults is associated with a statistically significant increase in urinary pH and citrate excretion, and these changes are linked to reduced calcium oxalate supersaturation through enhanced citrate-mediated calcium chelation, without statistically significant reductions in ionized calcium or calcium oxalate supersaturation.

Source: Malic Acid Supplementation Increases Urinary Citrate Excretion and Urinary pH: Implications for the Potential Treatment of Calcium Oxalate Stone Disease

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
30score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

How it works
1 study reviewed
In plain English

Taking 1200 mg of malic acid daily for 7 days increases urinary pH and citrate levels in healthy adults, which is linked to lower calcium oxalate supersaturation, but does not significantly lower ionized calcium or calcium oxalate supersaturation.

See the scientific wording

Ingestion of 1200 mg/day of malic acid for 7 days in eight healthy adults is associated with a statistically significant increase in urinary pH and citrate excretion, which may reduce calcium oxalate supersaturation through enhanced citrate-mediated calcium chelation, though these changes were not accompanied by statistically significant reductions in ionized calcium or calcium oxalate supersaturation.

Why this might work

When malic acid is consumed, the body breaks it down and produces bicarbonate, which makes the blood slightly less acidic. This change tells the kidneys to release more citrate into the urine instead of reabsorbing it. The extra citrate in the urine binds to calcium, preventing calcium from pairing with oxalate to form crystals.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Malic Acid Supplementation Increases Urinary Citrate Excretion and Urinary pH: Implications for the Potential Treatment of Calcium Oxalate Stone Disease

    Taking 1200 mg of malic acid daily for a week made urine less acidic and increased a substance called citrate, which can bind calcium and might help prevent kidney stones — even though the actual stone risk didn't drop enough to be certain. So it helps in the ways expected, but not strongly enough to guarantee protection.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

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