How many studies support Heat Therapy?

A systematic review and meta-analysis found heat therapy produces modest improvements in blood pressure and peripheral vascular function, and a separate meta-analysis found heat therapy may help patients with heart failure, though the evidence for the latter is not yet strong enough for firm clinical recommendations. That's backed by 6 published studies in Vitaebase's database, including 3 meta-analyses, the most recent from 2026 -- a modest but real research base.