This review of 6 studies with 339 people found hibiscus extract made virtually no difference for weight loss — participants lost an average of 0.27 kg more than those taking placebo, which is basically negligible. BMI and waist circumference also showed no meaningful changes. The good news: no safety issues were reported.

Researchers searched medical databases for rigorous studies (randomized controlled trials) comparing hibiscus supplements or tea to placebo or regular tea, then combined the results to see overall patterns.

Funding not disclosed in abstract