NutriDex

The Supplement Research Compendium
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Calamansi

Citrus x microcarpa

Tiny Filipino lime with outsized citrus bioactives

Preliminary evidence 🍎Fruits

✚ Updated · How we grade evidence

Evidence tier
Preliminary
Research weight
Citations
9 verified / 9
Classification
Fruits
❝
What the evidence says. Early or small human trials; promising but not yet conclusive.

Nutrition per serving ~7 small fruits (100 g)

100gSERVING
  • Water 88 g89%
  • Sugars 1.7 g2%
  • Fibre 2.8 g3%
  • Other carbs 6 g6%
  • Protein 0.7 g1%
  • Fat 0.2 g0%
What's in one serving, by weight — average composition (USDA).
Vitamin C33%Fiber10%Potassium2%Calcium3%Folate2%Vitamin A0%
One serving as % of the adult daily requirement (FDA Daily Values). The bold outer ring = 100% of a day's needs.
30 kcal0.7 g protein2.8 g fiber0.2 g fat
NutrientPer serving% daily value
Vitamin C30 mg33%
Fiber2.8 g10%
Potassium102 mg2%
Calcium33 mg3%
Folate8 µg DFE2%
Vitamin A2 µg RAE0%
Iron0.6 mg3%
Magnesium6 mg1%

Composition data: USDA FoodData Central ↗

What is Calamansi?

Calamansi (Citrus x microcarpa) is a fruit used for good vitamin c source supporting antioxidant defense and normal immune function. NutriDex grades the human evidence as Preliminary. Calamansi (calamondin) is a small Southeast Asian citrus prized as an acidulant; its juice and especially its peel concentrate vitamin C, the polymethoxyflavones nobiletin and tangeretin, the flavanone hesperidin, and the dihydrochalcone DGPP. Chemical-marker analysis quantified DGPP at roughly 25 mg/100 mL and nobiletin at about 2.4 mg/100 mL in calamondin juice. Direct human clinical trials on calamansi itself are essentially absent, so claims rest on (1) preclinical calamondin studies and (2) extrapolation from well-studied isolated citrus constituents. In high-fat-diet mice, 1–5% dietary calamondin puree slowed non-alcoholic fatty-liver progression and improved glucose tolerance. For its individual flavonoids, randomized human trials of hesperidin show modest reductions in systolic blood pressure, LDL and triglycerides, citrus polymethoxyflavones lowered cholesterol substantially in hypercholesterolemic hamsters, and vitamin C reviews show small reductions in cold duration and severity—but these used purified compounds or other citrus, not calamansi. The fruit is genuinely nutrient-dense and a healthy low-calorie flavoring, yet the species-specific human evidence is preliminary. Treat cardiometabolic and antidiabetic claims as plausible-but-unproven in people.

Purported Benefits

✓Good vitamin C source supporting antioxidant defense and normal immune function
✓Contains polymethoxyflavones (nobiletin, tangeretin) and the flavanone hesperidin, citrus compounds with lipid-metabolism activity documented in animal and human-isolated-compound research
✓Anti-hyperglycemic and glucose-tolerance effects in preclinical (animal/in vitro) models
✓Slowed non-alcoholic fatty-liver progression in high-fat-diet mice fed calamondin puree
✓Antioxidant peel phenolics (DGPP, hesperidin) with in vitro free-radical scavenging activity
✓Low-calorie acidulant useful as an alternative to added salt or sugar in cooking

Dosing & Compounds

Typical Dose
2–4 fruits' juice (about 15–30 mL) as a souring agent, or ~100 g whole fruit (roughly 7 small fruits) per use; no established therapeutic dose in humans.
Active Compounds
Ascorbic acid (vitamin C)Polymethoxyflavones — nobiletin, tangeretin, sinensetinFlavanone glycosides — hesperidin, naringinC-glycosyl dihydrochalcone — 3',5'-di-C-β-glucopyranosylphloretin (DGPP)Flavones — diosmin, diosmetinMonoterpenes — D-limonene (dominant peel-oil component)Phenolic acids (e.g., gallic acid) and pectin

Safety & Cautions

Highly acidic—erosive to tooth enamel and may aggravate GERD, reflux or mouth ulcers; dilute the juice. True citrus allergy or oral-allergy syndrome is possible. Unlike grapefruit, calamansi/calamondin is not an established CYP3A4 furanocoumarin inhibitor, but data are limited—use caution and consult a clinician if on narrow-therapeutic-index drugs. Vitamin C from concentrated juice or supplements above ~2 g/day can cause GI upset and, in predisposed people, may raise kidney-stone (oxalate) risk. Peel/seed extracts used in studies are far more concentrated than culinary intake and are not standardized supplements. Educational only — always check with your doctor or pharmacist before combining Calamansi with any medicine.

Key Studies

Meta-analysis of RCTs Khorasanian 2023 ✓ Source
Dose–response meta-analysis (13 RCTs, 705 adults): hesperidin lowered SBP −1.37 mmHg (95% CI −2.73 to −0.02), LDL −5.29 mg/dL (−9.63 to −0.95), triglycerides −13.85 mg/dL (−27.21 to −0.49) and TNF-α −2.74 pg/mL (−4.89 to −0.60).
Meta-analysis Hemilä 2023 ✓ Full text
Meta-analysis (10 trials, 15 comparisons): regular prophylactic vitamin C (≥1 g/day) reduced common-cold severity by ~15% (95% CI 9–21%), with a larger effect on severe symptoms.
Cochrane systematic review Hemilä 2013 ✓ PubMed
Cochrane review (29 comparisons, ~11,306 participants): regular vitamin C ≥0.2 g/day shortened cold duration ~8% in adults and ~14% in children but did not reduce incidence in the general population.
Narrative review Venkatachalam 2023 ✓ Full text
Comprehensive review of calamondin (Citrofortunella microcarpa) phytochemicals and bioactivities (antioxidant, anti-inflammatory, anti-diabetic, anti-angiogenic, antimicrobial); evidence derives from in vitro and animal models, with no human clinical trials.
Animal study (mouse) Shimizu 2021 ✓ PubMed
In C57BL/6 mice on a high-fat diet, 1–5% dietary calamondin puree reduced hepatic lipid accumulation and hepatocyte ballooning, improved glucose tolerance, and lowered serum Ccl2, slowing NAFLD progression.
Analytical/in vitro study Lou 2014 ✓ PubMed
HPLC of calamondin extracts identified DGPP as the dominant flavonoid, plus naringin, hesperidin, nobiletin, tangeretin and diosmin; hot-water peel extract at 90°C gave the highest total flavonoids/DGPP and antioxidant (DPPH) activity.
Analytical study Manthey 2012 ✓ PubMed
Calamondin chemical-marker study quantified polymethoxyflavones (nobiletin ~2.4 mg/100 mL) and the dihydrochalcone glucoside DGPP (~25.5 mg/100 mL) in calamondin juice by HPLC, used to detect adulteration of shiikuwasha juice.
In vitro study Lou 2014b ✓ PubMed
Soluble and insoluble phenolics of immature calamondin and their antioxidant activity varied with solvent and heat treatment; hot-water peel extract had high total phenolics correlating with DPPH scavenging potency.
Animal study (hamster) Kurowska 2004 ✓ PubMed
Diets with 1% citrus polymethoxylated flavones (mainly tangeretin/nobiletin) cut serum total cholesterol 19–27% and VLDL+LDL 32–40% in hamsters with diet-induced hypercholesterolemia.
9 sources cited · 9 verified Search all studies on PubMed ↗

Common questions about Calamansi

What is Calamansi used for?

Calamansi is most often taken for Good vitamin C source supporting antioxidant defense and normal immune function, Contains polymethoxyflavones (nobiletin, tangeretin) and the flavanone hesperidin, citrus compounds with lipid-metabolism activity documented in animal and human-isolated-compound research, Anti-hyperglycemic and glucose-tolerance effects in preclinical (animal/in vitro) models, Slowed non-alcoholic fatty-liver progression in high-fat-diet mice fed calamondin puree. Tiny Filipino lime with outsized citrus bioactives

Does Calamansi work — what does the evidence say?

Preliminary evidence. Early or small human trials; promising but not yet conclusive. Calamansi (calamondin) is a small Southeast Asian citrus prized as an acidulant; its juice and especially its peel concentrate vitamin C, the polymethoxyflavones nobiletin and tangeretin, the flavanone hesperidin, and the dihydrochalcone DGPP. Chemical-marker analysis quantified DGPP at roughly 25 mg/100 mL and nobiletin at about 2.4 mg/100 mL in calamondin juice. Direct human clinical trials on calamansi itself are essentially absent, so claims rest on (1) preclinical calamondin studies and (2) extrapolation from well-studied isolated citrus constituents. In high-fat-diet mice, 1–5% dietary calamondin puree slowed non-alcoholic fatty-liver progression and improved glucose tolerance. For its individual flavonoids, randomized human trials of hesperidin show modest reductions in systolic blood pressure, LDL and triglycerides, citrus polymethoxyflavones lowered cholesterol substantially in hypercholesterolemic hamsters, and vitamin C reviews show small reductions in cold duration and severity—but these used purified compounds or other citrus, not calamansi. The fruit is genuinely nutrient-dense and a healthy low-calorie flavoring, yet the species-specific human evidence is preliminary. Treat cardiometabolic and antidiabetic claims as plausible-but-unproven in people.

What is the typical dose of Calamansi?

2–4 fruits' juice (about 15–30 mL) as a souring agent, or ~100 g whole fruit (roughly 7 small fruits) per use; no established therapeutic dose in humans.

Is Calamansi safe? Any cautions or side effects?

Highly acidic—erosive to tooth enamel and may aggravate GERD, reflux or mouth ulcers; dilute the juice. True citrus allergy or oral-allergy syndrome is possible. Unlike grapefruit, calamansi/calamondin is not an established CYP3A4 furanocoumarin inhibitor, but data are limited—use caution and consult a clinician if on narrow-therapeutic-index drugs. Vitamin C from concentrated juice or supplements above ~2 g/day can cause GI upset and, in predisposed people, may raise kidney-stone (oxalate) risk. Peel/seed extracts used in studies are far more concentrated than culinary intake and are not standardized supplements.

How many studies support Calamansi?

NutriDex cites 9 sources for Calamansi, graded "Preliminary".

Cite this page
APA

Peh, D. (2026). Calamansi (Citrus x microcarpa): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/calamansi

BibTeX
@misc{nutridex_calamansi,
  author       = {Peh, Daryl},
  title        = {Calamansi (Citrus x microcarpa): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/calamansi},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-06-26}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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