Guide
Who should not take forskolin (Coleus forskohlii)?
Forskolin lacks safety research in pregnancy, breastfeeding, children, and most medication combinations. A pharmacology review separately flags blood-thinning medication, low blood pressure, and stomach ulcers as mechanism-based reasons for caution.
Forskolin hasn't been studied for safety in pregnancy, in children, or against most prescription medications, so the honest default for those groups is to ask a doctor rather than rely on a general guide. A pharmacology review also raises specific, mechanism-based concerns for anyone on blood-thinning medication, anyone with already-low blood pressure, and anyone with a history of stomach ulcers.
| Situation | Why it matters |
|---|---|
| Pregnant or breastfeeding | No published safety data exists in this population |
| Children | No dosing or safety research exists for children |
| Taking blood-thinning medication | A pharmacology review notes forskolin may interact with it, based on its mechanism |
| Already-low blood pressure, or taking blood pressure medication | Forskolin's mechanism is linked to blood-vessel relaxation, a reason to check with a doctor |
| History of stomach ulcers | A pharmacology review describes forskolin as potentially raising stomach acid |
| Reduced kidney or liver function | No dedicated research exists either way |
| Scheduled for surgery | Ask a doctor about stopping any supplement beforehand, forskolin included |
Pregnancy and breastfeeding
No published human safety data exists on forskolin in pregnant or breastfeeding people, or their infants. That's an absence of research, not a safety finding in either direction — ask a doctor before use in either situation.
Children
No dosing or safety research exists for forskolin in children, so there's no dose or use guidance to offer for that age group. Ask a doctor or pediatrician before giving a child any forskolin product.
Blood-thinning medication
A 2012 pharmacology review of forskolin's research and mechanism notes that forskolin may interact with blood-thinning medication, potentially adding to its effect, based on forskolin's pharmacological profile rather than a dedicated interaction trial (PMID 23023353). If you take a blood thinner, ask a doctor before adding forskolin. More in forskolin and medications: what to check.
Low blood pressure, or blood pressure medication
Forskolin's underlying mechanism — raising cAMP and relaxing blood vessels — is the basis for a caution around already-low blood pressure or a medication that also lowers it. If your blood pressure runs low, or you take medication for it, ask a doctor before adding forskolin, since this hasn't been tested directly in either group.
History of stomach ulcers
The same pharmacology review describes forskolin as potentially increasing stomach acid, and flags a caution around combining it with ulcer medications (PMID 23023353). If you have a history of ulcers or acid reflux, ask a doctor before trying it.
Reduced kidney or liver function
No dedicated research has tested forskolin specifically in people with reduced kidney or liver function. That's an absence of evidence, not evidence of safety — ask a doctor before adding it if either applies to you.
Before surgery
If forskolin is part of your regular routine and you have surgery scheduled, tell your surgical team. Its blood-pressure-lowering mechanism is a reasonable thing to flag before any procedure, even without a specific trial testing that scenario.
Who this doesn't apply to
The two existing human trials on the oral capsule only enrolled adults who were overweight or mildly overweight, so even outside the groups above, nobody outside that population has actually been studied (PMID 16129715, PMID 18500958). That's a narrow evidence base, not a documented reason for concern in a healthy adult — but it also doesn't establish that forskolin reliably does anything, covered in forskolin benefits: what the research does and doesn't show.
Questions people ask
Who should not take forskolin?
People who are pregnant or breastfeeding, children, anyone taking blood-thinning medication or blood pressure medication, anyone with a history of stomach ulcers, and anyone with reduced kidney or liver function should check with a doctor first — none of those groups has dedicated research to rely on instead.
Is forskolin safe for kidneys?
No dedicated research has tested that directly, in either direction. If you have reduced kidney function, ask a doctor before adding forskolin.
Does forskolin affect blood pressure?
Its mechanism is linked to relaxing blood vessels, which is why a pharmacology review raises it as a caution for people with already-low blood pressure or on blood pressure medication. Neither existing human trial found a significant change in blood pressure versus placebo, though blood pressure wasn't the focus of either one.
What should you not take with forskolin?
See forskolin and medications: what to check for the specific categories — blood-thinning medication, stimulant decongestants, and ulcer medications are the ones with a documented, mechanism-based reason for caution.
Related reading: forskolin side effects, forskolin and medications: what to check, and forskolin benefits: what the research does and doesn't show.
Sources
- Forskolin: upcoming antiglaucoma molecule A 2012 review of forskolin as a glaucoma research candidate describes its cAMP-based mechanism for lowering eye pressure, tested topically as drops rather than as an oral supplement.
- 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.
*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.