Study
The effect of hydrogen-rich water interventions on lipid profiles in adults with overweight or obesity and associated metabolic disorders: a systematic review and meta-analysis of randomized controlled trials
13 RCTs (n=757) found hydrogen-rich water reduced total cholesterol by 6.71 mg/dL and LDL by 3.21 mg/dL, but authors concluded effects were below clinically meaningful thresholds.
Summary Does hydrogen-rich water improve cholesterol in adults with excess weight? Show / hide ↓
Researchers combined 13 randomized controlled trials, where people are assigned by chance to different treatments, involving 757 adults with overweight or obesity and related metabolic problems. The studies tested hydrogen-rich water, which is water containing extra dissolved hydrogen gas. Compared with control treatments, it lowered total cholesterol by about 6.7 mg/dL and LDL cholesterol, often called bad cholesterol, by about 3.2 mg/dL. It did not clearly change triglycerides or HDL cholesterol, often called good cholesterol. The researchers said these cholesterol changes were too small to meaningfully reduce heart risk.
What this means for you: This evidence does not support buying hydrogen-rich water as a cholesterol treatment. Proven approaches such as prescribed medicines, a healthy diet, physical activity, and weight management remain more important.
moderate evidenceA 2026 systematic review and meta-analysis analyzed 13 RCTs (n=757 participants) of hydrogen-rich water in adults with BMI >=25. HRW significantly reduced total cholesterol (WMD: -6.71 mg/dL, 95% CI: -10.38 to -3.04, p<0.001) and LDL-C (WMD: -3.21 mg/dL, 95% CI: -6.31 to -0.10, p=0.043). Effects on triglycerides and HDL-C were not significant. The authors explicitly stated that the magnitude of these changes is below clinically meaningful thresholds for cardiovascular risk reduction, and that current evidence does not support routine use of HRW as a lipid-lowering therapy. The review searched Scopus, PubMed, Web of Science, and Embase for RCTs published up to November 2025.
HRW supplementation in overweight or obese adults produces small, statistically detectable but clinically modest reductions in TC and LDL-C, with minimal effects on TG and HDL-C. These effects are below thresholds considered meaningful for cardiovascular risk reduction and should not justify routine use of HRW as a lipid-lowering therapy outside of research settings.
The effect sizes, while statistically significant, are clinically negligible — a 6.71 mg/dL TC reduction is less than what a single serving of oatmeal achieves. The authors correctly noted this. Heterogeneity across studies was not fully explored. Most included RCTs were small (N<50).
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