Herb Profile
Grapefruit
Botanical profile with evidence, safety, and practical fit.
Last reviewed:
C PreliminaryUse extra caution — Major food drug interaction risk: can raise exposure of statins, calcium channel blockers, immunosuppressants, antiarrhythmics, and other CYP3A4/OATP substrates. Details
- Evidence
- Strong Human Evidence
- Typical onset
- Varies by prep
- Safety rating
- High caution
- Best for
- Digestive, Metabolic health
- Avoid / review if
- Avoid Or Medically Supervise With Drugs Labeled For Grapefruit Interaction, Narrow Therapeutic Index Drugs, And Complex Cardiovascular/Transplant Regimens.
Monograph visual
Grapefruit
Generated profile category visual
Where to go next — guides & comparisons
Continue reading
- If you want to browse more herbs → All herbs
Safety & Cautions
Major food drug interaction risk: can raise exposure of statins, calcium channel blockers, immunosuppressants, antiarrhythmics, and other CYP3A4/OATP substrates.
28%
High caution — review carefully
Detailed safety fields
Pregnancy, breastfeeding, and contraindications
- - Avoid Or Medically Supervise With Drugs Labeled For Grapefruit Interaction
- - Narrow Therapeutic Index Drugs
- - And Complex Cardiovascular/Transplant Regimens.
- - CYP3A4
- - P Gp
- - And OATP Mediated Interactions
- - Effects May Persist Beyond A Single Serving.
Safety classifications
- - Interaction-Aware: Medication or interaction context is explicitly noted.
Full safety note
- - Major food drug interaction risk: can raise exposure of statins, calcium channel blockers, immunosuppressants, antiarrhythmics, and other CYP3A4/OATP substrates.
Safety labels
- - Interaction-Aware
Evidence Summary
Evidence lens
Most useful for practical interpretation when safety context also fits.
StrongStrong Human Evidence
Human clinical evidence: Present in source signals
Mechanistic / preclinical: Mechanism mapped — Metabolic Regulation
Research maturity: Preliminary or mixed — Long Term Human Evidence May Be Limited.
Safety boundary: Safety note available — Major food drug interaction risk: can raise exposure of statins, calcium channel blockers, immunosuppressants, antiarrhythmics, and other CYP3A4/OATP substrates.
How evidence grades work
Each grade reflects the strength and consistency of published human evidence — not marketing claims. Grades are based on study count, design quality, effect size, consistency, and recency.
A
Strong
Multiple RCTs, consistent direction, adequate effect size
B
Moderate
Some RCTs or consistent observational data in humans
C
Preliminary / Mixed
Animal or in-vitro only, or conflicting human data
D
Traditional / Theoretical
Traditional use only; no controlled human trials
Dosing & Timing
Dose guidance
Preparation specific; use standardized product label for Interaction risk varies by whole fruit and require source backed dosage review before therapeutic claims.
How Grapefruit Works
Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.
Mechanism Pathway — How Grapefruit Works
CompoundTarget / ReceptorMechanismEffect / Outcome
Mechanisms & Biological Pathways
Preclinical pathways
Proposed mechanisms from in vitro and animal research; these do not confirm clinical outcomes in humans.
Metabolic Regulation
Active Compounds
Key constituents studied in Grapefruit, with full pharmacology and safety profiles.
Condition guides
Compare & Sourcing
Compare side-by-side tradeoffs or verify active marker guidelines.
Review available sources for Grapefruit
Independent database mapping — evaluated separately from safety and efficacy scores.
Affiliate Disclosure: Shopping links may earn this site a commission at no cost to you. Links are chosen on quality and availability, never commission tiers; safety warnings and evidence ratings stay independent.
Compare herbs
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.
Editorial Review
Checked against primary sources, cited evidence, and contraindication language before publication. Evidence claims, safety language, and affiliate modules are reviewed independently. Not personal medical advice.
Free safety checklist
Get the Grapefruit research notes
Evidence summaries, dosing context, and safety updates for this herb — straight to your inbox.
We use your email to send the checklist and occasional evidence-first supplement updates. Unsubscribe anytime. Privacy policy.
Botanical profile context
How to interpret Grapefruit
Grapefruit dosage ranges, effects, drug interactions, and harm-reduction safety guide for digestive. Strong Human Evidence research evidence. Use this herb profile as a starting point for evidence review, not as a recommendation to start a new supplement. Botanical products can vary by plant part, extract ratio, standardization, dose, and contaminant testing, so two labels with the same common name may not behave the same way.
When reviewing Grapefruit, compare the traditional-use context against the human evidence, mechanism notes, and safety cautions. Pay special attention to pregnancy, breastfeeding, liver or kidney disease, blood-pressure effects, sedation, stimulation, anticoagulant use, antidepressants, and any prescription medication overlap.
For product decisions, prefer transparent labels, named extracts, clear serving sizes, and third-party quality testing. Avoid treating a long list of possible mechanisms as proof that an herb will solve a specific condition.