What the evidence says. Early or small human trials; promising but not yet conclusive.
Nutrition per serving 5 fruit (100 g)
Water78 g78%
Sugars20 g20%
Fibre0.9 g1%
Protein0.7 g1%
Fat0.2 g0%
What's in one serving, by weight — average composition (USDA).One serving as % of the adult daily requirement (FDA Daily Values). The bold outer ring = 100% of a day's needs.
Rambutan (Nephelium lappaceum) is a fruit used for modest vitamin c contribution supporting collagen synthesis and normal immune function. NutriDex grades the human evidence as Preliminary. Rambutan flesh is a low-fat tropical fruit whose best-documented nutritional role is as a modest source of vitamin C, fiber, copper and manganese. The great majority of its purported health effects (antioxidant, antidiabetic, antimicrobial, antiviral, anti-aging) come from polyphenol-rich peel and seed extracts studied in vitro and in rodent models, not from eating the fruit. For example, rambutan peel phenolic extract lowered fasting glucose, cholesterol and triglycerides in streptozotocin/high-fat-diet diabetic mice, and geraniin isolated from the rind inhibited dengue virus type-2 (IC about 1.75 microM) in Vero cell culture. There are essentially no randomized controlled trials or prospective cohorts evaluating rambutan fruit consumption and human disease outcomes, so causal claims for humans are unsupported. The concentrations of bioactives used in lab studies far exceed what edible flesh delivers, and peel/seed are not customary foods. Note also that the only USDA reference value for rambutan is for the fruit canned in syrup, which is substantially higher in sugar than fresh flesh. Overall the human weight of evidence is preliminary: rambutan is a healthful, vitamin-C-containing fruit, but specific therapeutic benefits remain unproven in people.
Purported Benefits
✓Modest vitamin C contribution supporting collagen synthesis and normal immune function
✓Antioxidant capacity from peel/seed polyphenols (geraniin, ellagitannins) demonstrated in vitro and in animal models
✓Antidiabetic / glycemic-lowering signals from peel phenolic extracts in diabetic rodents (not from eating the flesh)
✓Antimicrobial activity of peel extracts against foodborne and Gram-negative bacteria in vitro
✓Antiviral activity of geraniin from the rind against dengue virus type-2 in cell culture
✓Provides small amounts of dietary fiber, copper and manganese
Dosing & Compounds
Typical Dose
About 5-6 fresh fruit (~100 g edible flesh); flesh eaten raw, seed and peel not normally consumed.
Active Compounds
Hydrolyzable tannins / ellagitannins (geraniin, corilagin)Phenolic acids (ellagic acid, gallic acid)Flavonoids (quercetin, rutin, kaempferol glycosides)Vitamin C (L-ascorbic acid)Proanthocyanidins / condensed tanninsMinerals (potassium, copper, manganese, iron)Dietary fiber (soluble and insoluble)Seed lipids (oleic and arachidic acid in seed fat)
Safety & Cautions
⚠
Generally safe as food. The seed is reported to be mildly toxic when raw (contains saponin-like and possibly other antinutrient compounds) and should not be eaten unroasted. Peel and seed extracts used in research are not validated as supplements and lack human safety data. Canned rambutan is packed in sugar syrup; people with diabetes should account for the added carbohydrate. Allergy is uncommon but possible. No well-characterized drug interactions for the flesh, though concentrated polyphenol extracts could theoretically affect glucose-lowering or anticoagulant therapy. Educational only — always check with your doctor or pharmacist before combining Rambutan with any medicine.
Rambutan is most often taken for Modest vitamin C contribution supporting collagen synthesis and normal immune function, Antioxidant capacity from peel/seed polyphenols (geraniin, ellagitannins) demonstrated in vitro and in animal models, Antidiabetic / glycemic-lowering signals from peel phenolic extracts in diabetic rodents (not from eating the flesh), Antimicrobial activity of peel extracts against foodborne and Gram-negative bacteria in vitro. Hairy tropical fruit with modest vitamin C and polyphenol-rich peel
Does Rambutan work — what does the evidence say?
Preliminary evidence. Early or small human trials; promising but not yet conclusive. Rambutan flesh is a low-fat tropical fruit whose best-documented nutritional role is as a modest source of vitamin C, fiber, copper and manganese. The great majority of its purported health effects (antioxidant, antidiabetic, antimicrobial, antiviral, anti-aging) come from polyphenol-rich peel and seed extracts studied in vitro and in rodent models, not from eating the fruit. For example, rambutan peel phenolic extract lowered fasting glucose, cholesterol and triglycerides in streptozotocin/high-fat-diet diabetic mice, and geraniin isolated from the rind inhibited dengue virus type-2 (IC about 1.75 microM) in Vero cell culture. There are essentially no randomized controlled trials or prospective cohorts evaluating rambutan fruit consumption and human disease outcomes, so causal claims for humans are unsupported. The concentrations of bioactives used in lab studies far exceed what edible flesh delivers, and peel/seed are not customary foods. Note also that the only USDA reference value for rambutan is for the fruit canned in syrup, which is substantially higher in sugar than fresh flesh. Overall the human weight of evidence is preliminary: rambutan is a healthful, vitamin-C-containing fruit, but specific therapeutic benefits remain unproven in people.
What is the typical dose of Rambutan?
About 5-6 fresh fruit (~100 g edible flesh); flesh eaten raw, seed and peel not normally consumed.
Is Rambutan safe? Any cautions or side effects?
Generally safe as food. The seed is reported to be mildly toxic when raw (contains saponin-like and possibly other antinutrient compounds) and should not be eaten unroasted. Peel and seed extracts used in research are not validated as supplements and lack human safety data. Canned rambutan is packed in sugar syrup; people with diabetes should account for the added carbohydrate. Allergy is uncommon but possible. No well-characterized drug interactions for the flesh, though concentrated polyphenol extracts could theoretically affect glucose-lowering or anticoagulant therapy.
How many studies support Rambutan?
NutriDex cites 10 sources for Rambutan, graded "Preliminary".
Cite this page
APA
Peh, D. (2026). Rambutan (Nephelium lappaceum): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 16 Sept 2026, from https://nutridex.info/s/rambutan
BibTeX
@misc{nutridex_rambutan,
author = {Peh, Daryl},
title = {Rambutan (Nephelium lappaceum): Benefits, Dosage, Side Effects \& Evidence},
year = {2026},
howpublished = {NutriDex --- The Supplement Research Compendium},
url = {https://nutridex.info/s/rambutan},
note = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-09-16}
}
For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.