The short answer. There isn't much data on Fat Burners yet — 4 mentions, 4 with a clear outcome — so treat these numbers as anecdotal. There is a moderate body of research — 2 meta-analyses and 1 trials.
From 4 mentions in total — the rest didn't say how it went and aren't counted.
Of the people who reported each effect, the share who said it got better.
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
At least one meta-analysis, or 5+ randomized controlled trials. The grade measures how much human research exists — read the conclusions below for what it found.
Conclusion: There appears to be limited benefit that may be derived from the inclusion of thermogenic dietary supplements to reduce body mass and improve cardiometabolic health for individuals who are overfat.
PubMed 33427571 ↗Conclusion: Current evidence suggests that green tea could have quite minimal additive benefit over exercise-induced weight loss. However, incorporation of green tea into exercise training does not seem to exert additional benefits on lipid profile and it warrants further investigations in the future.
PubMed 39350601 ↗As stated by users — not a recommendation. Follow the label or your doctor.
How often each side effect came up across all reports.
First-hand experiences, quoted verbatim. We show one positive and one negative where both exist.
“I abused fat-burners while in high school during wrestling season...Up to 300mg per serving...I 100% believe this had a bad impact on my mental health”
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 3, 2026. How we rate