Research review
Does forskolin help with weight loss? What the research does and doesn't show
The two existing placebo-controlled human trials on forskolin and body composition, both using the same extract and dose, disagreed with each other — favorable changes in men, no significant change in women. Two independent reviews of weight-loss supplements both described forskolin's evidence as thin or insufficient.
The evidence doesn't support forskolin as a reliable weight-loss aid. Only two placebo-controlled human trials on body composition exist, both using the same extract and dose — and they disagreed: one found favorable changes in men, the other found none in women. Two independent reviews of weight-loss and "fat burner" supplements both grouped forskolin among ingredients with thin or insufficient evidence.
What the evidence doesn't support
It doesn't support forskolin capsules as a dependable way to lose body fat or body weight — the two trials that exist didn't agree with each other. It doesn't support the "fat burner" framing forskolin is commonly marketed with: two independent reviews of the broader weight-loss supplement category both placed forskolin among ingredients with thin or insufficient evidence, not the small number reviewers consider well supported. And it doesn't support the idea that a higher dose would produce a more reliable result — no trial has tested more than one dose against another.
What the trials found
A 2005 randomized, double-blind, placebo-controlled trial gave 30 overweight or obese men either 250 mg of a 10%-standardized forskolin extract twice a day (500 mg of extract, about 50 mg of forskolin itself, per day) or a placebo, for 12 weeks. The forskolin group had a significantly greater decrease in body fat percentage and fat mass, measured by DXA scan, than the placebo group, and a significantly greater increase in bone mass. Lean body mass showed a trend toward increase that didn't reach statistical significance. Free testosterone rose significantly more in the forskolin group than placebo (PMID 16129715).
A separate 2005 trial, also randomized, double-blind and placebo-controlled, gave the identical extract and dose to mildly overweight women for the same 12 weeks. This time, there were no significant differences between the forskolin and placebo groups in body mass, fat mass, fat-free mass, or body fat percentage. The forskolin group did tend to gain less body mass over the study than the placebo group, and reported less hunger and fullness — subjective measures, not body-composition outcomes. The study's own conclusion was that forskolin didn't appear to promote weight loss, though it might help limit weight gain (PMID 18500958).
Two broader reviews add context rather than new trial data. A 2016 review of newer weight-loss dietary supplements — covering forskolin alongside about ten others, including Garcinia cambogia and bitter orange — concluded the evidence for this whole category was insufficient to recommend safe use for weight management (PMID 27053066). A 2011 review specifically of "fat burner" supplements singled out caffeine and green tea as the only two with data actually backing their fat-metabolism claims, placing forskolin among several others described as showing "some promise" but lacking the evidence to back it up (PMID 21951331).
| Trial | Population | Dose | Result |
|---|---|---|---|
| 2005 RCT | 30 overweight/obese men | 500 mg extract/day (10%), 12 weeks | Lower body fat %, fat mass; higher bone mass, free testosterone |
| 2005 RCT | 23 mildly overweight women | Identical extract and dose, 12 weeks | No significant body-composition change vs. placebo |
Questions people ask
Is forskolin good for weight loss?
The two trials that exist disagree: one found favorable body-composition changes in men, the other found no significant change in women using the identical extract and dose. Two broader reviews of weight-loss supplements both described the evidence for forskolin as thin. That's not a basis for expecting reliable weight loss from it.
How much forskolin should I take for weight loss?
Both body-composition trials used the same amount: 250 mg of a 10% extract, twice a day (500 mg extract/day, about 50 mg of forskolin itself). No trial has tested whether a different dose changes the result, and the trial results themselves were mixed at that dose. See how much forskolin should you take a day? for the fuller dosing picture.
How does forskolin help with weight loss, and when should I take it?
The proposed mechanism is that forskolin raises a signaling molecule called cAMP inside cells, which is involved in fat metabolism among other processes. Raising cAMP in a lab sense is a mechanism, not a guaranteed outcome — the men's trial found favorable body-composition changes, the women's trial using the identical dose did not. Neither trial tested a specific time of day, so there's no timing recommendation the research supports.
When to talk to a doctor
Forskolin is not a treatment for obesity, and nothing in the research above supports using it as a substitute for medical guidance on weight. If you're working on weight change, a doctor or registered dietitian can offer an approach based on your specific health history. If you take a prescription medication, check forskolin and medications: what to check before adding it.
Related reading: forskolin benefits: what the research does and doesn't show, how much forskolin should you take a day?, and forskolin side effects.
Sources
- Body composition and hormonal adaptations associated with forskolin consumption in overweight and obese men A 2005 trial in 30 overweight or obese men used 250 mg of a 10% forskolin extract, twice a day, for 12 weeks — the standardization and dose referenced elsewhere on this site.
- Effects of coleus forskohlii supplementation on body composition and hematological profiles in mildly overweight women A 2005 trial in mildly overweight women used the identical extract and dose as the men's trial: 250 mg of a 10% forskolin extract, twice a day, for 12 weeks.
- New Dietary Supplements for Obesity: What We Currently Know A 2016 review of newer weight-loss dietary supplements — forskolin among roughly ten others — concluded the evidence for this group overall was insufficient to recommend their safe use for weight management.
- Fat burners: nutrition supplements that increase fat metabolism A 2011 review of 'fat burner' supplements found caffeine and green tea were the only two with data backing their fat-metabolism claims; forskolin was grouped with several others as showing some promise but lacking sufficient evidence.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.