The Claim
Malic acid supplementation does not significantly alter the supersaturation of brushite or octacalcium phosphate in urine, despite increasing urinary pH, indicating that the influence of elevated urinary pH on calcium phosphate stone risk is dependent on the specific salt involved.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Taking malic acid raises urine pH but does not change the tendency of brushite or octacalcium phosphate to form crystals, meaning that higher pH does not universally increase stone risk—it depends on the specific mineral compound.
See the scientific wording
Malic acid supplementation does not significantly alter supersaturation of brushite or octacalcium phosphate despite increasing urinary pH, suggesting that the effect of pH elevation on calcium phosphate stone risk is salt-specific.
Malic acid breaks down in the body to make the blood and urine more alkaline. This causes more citrate to be released into the urine, which binds calcium and reduces calcium oxalate stone risk. But for brushite and octacalcium phosphate, the higher pH does not increase their tendency to form crystals because their mineral structure depends on different calcium and phosphate arrangements that are not disrupted by citrate or pH alone.
What the research says
1 studyTaking malic acid raises urine pH, but it doesn't make all types of kidney stones more likely — only some, like hydroxyapatite, while others, like brushite and octacalcium phosphate, stay the same. So the effect depends on the type of mineral.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.