Force Factor LeanFire UC
by Force Factor
"GNC's best-selling thermogenic with Capsimax, green tea, and caffeine for metabolism and energy"
Overview
Force Factor LeanFire UC is a thermogenic fat burner that combines Capsimax (concentrated capsaicin from cayenne pepper), green tea extract (EGCG), caffeine, and B vitamins for metabolism support and energy. Capsimax is a patented form of capsaicin that provides the thermogenic benefits of hot peppers without the stomach burn, thanks to its OmniBead beadlet technology. The formula also includes Advantra Z (bitter orange extract) and TeaCrine (theacrine) for sustained energy without the crash. Force Factor is one of GNC's best-selling brands and LeanFire has been a consistent top seller in the fat burner category.
Key Ingredients
| Ingredient | Amount |
|---|---|
| Capsimax (Cayenne Pepper Extract) | Included |
| Green Tea Extract (EGCG) | Included |
| Caffeine | ~200 mg |
| Advantra Z (Bitter Orange) | Included |
| TeaCrine (Theacrine) | Included |
Pros & Cons
What We Like
- Patented Capsimax (no stomach burn)
- TeaCrine for sustained energy
- GNC best-seller
- Multiple thermogenic pathways
- 8,000+ Amazon reviews
What Could Be Better
- Proprietary blend (doses undisclosed)
- Contains bitter orange (controversial)
- Stimulant-heavy formula
- Weight loss effects are modest
Who Is This For?
Best For
- Those wanting thermogenic metabolism boost
- GNC shoppers
- Energy + fat burning combo seekers
- Those who tolerate stimulants well
Not Ideal For
- Stimulant-sensitive individuals
- Those with heart conditions
- Those wanting transparent dosing
- Pregnant or nursing women
Our Verdict
Force Factor LeanFire UC is a well-formulated thermogenic with patented Capsimax and sustained-energy TeaCrine. The proprietary blend is the main drawback — we'd prefer transparent dosing. For those who respond well to stimulant-based fat burners, it provides noticeable energy and thermogenesis.