Most 'fat burners' have, at best, small effects from ingredients like caffeine and green tea extract, and many hide doses or overpromise. They can offer minor appetite or metabolism support, but none override diet and activity, and dramatic claims are red flags.
- Effects are small at best, from a few ingredients.
- Many hide doses or overpromise.
- None override diet and activity.
- Named formulas you can verify are better.
What the evidence supports
A handful of ingredients — caffeine, green tea extract — have small, real metabolic effects in studies. Most others are weak, mixed or marketing-led. The NCCIH is a sober source.
The red flags
Hidden 'proprietary blends', 'FDA approved' claims (no supplement is), miracle promises and fake urgency are all warning signs the FTC flags. If a product won't name its doses, you can't judge it.
Where honest formulas fit
A named formula like SodaSlim, framed as support for diet and activity with a real guarantee, is the more honest end of the category — still support, never a substitute.