Hydrogen water is sold as an antioxidant miracle water, but the results measured on blood lipids are unremarkable: Jamialahmadi 2024 pooled 8 randomised controlled trials with 357 patients with metabolic disorders, and changes in LDL and total cholesterol did not reach statistical significance while triglycerides fell only slightly, which the authors themselves called a modest effect. These trials also never measured hard outcomes such as heart attack, stroke or death.