Goal guide
Fat loss support
Compare fat-loss supplement claims conservatively, with stimulant load, blood pressure, appetite context, and evidence limits kept visible.
Quick picks
Match your situation
Caffeine-based thermogenic support
Caffeine
Metabolic marker support
Berberine
Appetite and fiber support
Psyllium
Options compared
Sorted by how people usually approach this goal. “Why people stop” is included because the reason a supplement gets abandoned is usually more useful than its best-case claim.
| Option | Best for | Onset | Evidence | Risk | Why people stop |
|---|---|---|---|---|---|
| Caffeine | Short-term alertness and thermogenic context | 15 to 60 minutes | Strong for alertness, modest for energy expenditure | Moderate | Jitters, tolerance, sleep disruption |
| Green Tea Extract | Catechin and caffeine-adjacent metabolic support | Days to weeks | Limited to moderate with modest effect sizes | Moderate | GI upset or concern about concentrated extracts |
| Berberine | Metabolic marker support rather than direct fat loss | 2 to 8 weeks | Moderate for glucose and lipid markers in select populations | Moderate | GI side effects or medication-interaction concerns |
| Psyllium | Satiety, fiber intake, and lipid-adjacent support | Days to weeks | Moderate to strong for fiber-related endpoints | Low to moderate | Texture, bloating, or routine friction |
Caffeine
Avoid if: Panic tendency, uncontrolled hypertension, arrhythmia, or late-day use
Form: Measured caffeine from coffee, tea, or capsules
Green Tea Extract
Avoid if: Liver concerns or high-dose concentrated extract use without review
Form: Moderate-dose EGCG-containing green tea extract
Berberine
Avoid if: Pregnancy, breastfeeding, diabetes medications, or complex medication use without clinician review
Form: Berberine capsules with meal timing context
Psyllium
Avoid if: Medication timing conflicts or inadequate fluid intake
Form: Psyllium husk powder with water
Related goals
Safety first · Harm reduction
This information is educational and not medical advice. Start low, avoid risky combinations, and consult a licensed clinician before making health decisions—especially if you use medications, have diagnosed conditions, or are pregnant/breastfeeding.
Learn how we evaluate confidence, safety, and intensity on the methodology page.