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Noni (Morinda citrifolia)
A traditional Polynesian fruit juice marketed for 'immune support' and general wellness. The efficacy evidence is thin (mostly industry-funded antioxidant studies), and it carries real safety flags: published case reports of liver injury and a high potassium content that is hazardous in kidney disease.
What the evidence says
Most Noni studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality randomised trials published 2004–2026 with a typical study size of 81 participants.
Based on 17 studies · 9 RCTs · 369 total participants
Confidence
Moderate confidenceBy outcome
Earns only an Emerging 2 because the single human efficacy trial was industry-funded and measured surrogate antioxidant markers, while independent case reports document liver injury and high potassium content poses real risk.
1 trial ongoing or recruiting · 7 completed on ClinicalTrials.gov
Registered trials show research momentum for Noni, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Sep 2026
Noni (Morinda citrifolia) is a tropical fruit traditionally consumed in Polynesia and now sold worldwide as a wellness juice, often with sweeping 'immune-boosting' claims.
The honest reality is that high-quality efficacy evidence is essentially absent: the most-cited human trial — an antioxidant study in heavy smokers — was conducted and funded by a noni-juice manufacturer and measured only surrogate oxidative-stress markers, not clinical outcomes.
There is no convincing evidence that noni supports immunity, fights disease, or improves any hard health endpoint. More importantly, noni carries genuine safety concerns.
Multiple independent case reports describe acute hepatitis and even sub-acute liver failure (one requiring transplantation) temporally linked to noni-juice consumption, with anthraquinones the suspected hepatotoxins.
Noni juice is also high in potassium — comparable to orange or tomato juice — which can be dangerous for people with chronic kidney disease or those on potassium-affecting medications.
This is a supplement where the marketing dramatically outruns the evidence, and where the safety profile, not the efficacy, is the headline.
Noni juice lowered plasma superoxide anion radicals and lipid hydroperoxides in a smoker trial — surrogate oxidative-stress markers, not clinical outcomes.
Noni contains anthraquinones, the compounds suspected in reported cases of noni-associated liver injury.
How Noni works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Avoid — the high potassium content can cause dangerous hyperkalemia.
Avoid — multiple case reports of noni-associated liver injury.
Avoid — historically used as an emmenagogue/abortifacient and not adequately studied.
Noni juice is high in potassium; combining with potassium-retaining medications can raise the risk of dangerous hyperkalemia, especially in kidney disease.
Noni has case-reported hepatotoxicity; combining with other liver-stressing agents may compound risk.
High vitamin K and potassium content of noni products may affect anticoagulation control.
Tip: Discontinue immediately and seek care if jaundice, dark urine, or right-upper-quadrant pain occur; avoid in liver disease
Tip: Avoid in kidney disease and with potassium-retaining drugs
Tip: Reduce dose; take with food
The current evidence for Noni is insufficient to assign an evidence score, based on 15 indexed studies. A traditional Polynesian fruit juice marketed for 'immune support' and general wellness. The efficacy evidence is thin (mostly industry-funded antioxidant studies), and it carries real safety flags: published case reports of liver injury and a high potassium content that is hazardous in kidney disease. Representative study: PMID 19807926.
The commonly studied dose of Noni is No established efficacy dose. Trials used ~30-118 mL/day of juice. Given the safety profile, no dose can be recommended for general use.. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Noni is with meals. Take it with food. If used at all, taken with meals; there is no efficacy-validated dose and there are documented hepatic risks.
Noni should be used with caution — talk to a healthcare provider before taking it. Reported side effects are uncommon and include hyperkalemia, GI upset / diarrhea, liver injury / hepatitis. Use caution if any of these apply to you: Chronic kidney disease (high potassium content — risk of hyperkalemia); Pre-existing liver disease or elevated liver enzymes; Concurrent hepatotoxic medications.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 17 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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