Reviews in this category
What you need to know about Weight Loss
The weight loss supplement market is the most heavily marketed — and most clinically disappointing — category in supplementation. We apply strict evidence standards to separate the handful of supported ingredients from the sea of hype.
Every review in this category cites primary literature. We do not accept payment from brands in this space and our scores are never adjusted based on affiliate commission rates.
Key ingredients — what the evidence shows
These are the most commonly included ingredients in weight loss supplements. The evidence summary reflects the current state of peer-reviewed human research, not manufacturer claims.
| Ingredient & Common Dose | Evidence Summary |
|---|---|
Caffeine (100–200mg) | Strongest thermogenic evidence of any ingredient. Short-term metabolic boost well-documented. Tolerance develops quickly. |
Green Tea Extract/EGCG (250–500mg) | Modest but consistent effect on fat oxidation in RCTs. Works synergistically with caffeine. |
Glucomannan (3g before meals) | Best appetite-suppression evidence of any supplement. EFSA approved health claim for weight management. |
Berberine (500mg 3x/day) | Strong AMPK activation data. Several RCTs show weight and metabolic benefits comparable to some medications. |
5-HTP (100–300mg) | Serotonin precursor that may reduce carbohydrate cravings. Limited but positive RCT evidence for appetite control. |
What to look for in a high-quality product
- Full ingredient transparency — no proprietary blends that hide individual doses
- Ingredients dosed at clinically studied amounts (not token amounts for label appeal)
- Third-party testing certificate from NSF, USP, Informed Sport, or Labdoor
- GMP-certified manufacturing facility
- No FDA warning letters or recall history for the manufacturer
- Money-back guarantee of at least 60 days
Weight Loss supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare professional before starting any supplement, especially if you take prescription medications.
Red flags to avoid
- Products that promise dramatic or overnight results
- Proprietary blends that list ingredients without individual doses
- No third-party testing or certificate of analysis available
- Manufacturers with active FDA warning letters or recall history
- Websites that suppress negative reviews or use fake testimonials
Have a product you'd like us to review, or spotted an error? Contact our editorial team.