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The Supplement Research Compendium
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Dragon Fruit (Pitaya)

Hylocereus undatus / H. polyrhizus

Betalain-rich cactus fruit for vascular health

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 1 medium (227 g)

227gSERVING
  • Water 190.7 g83%
  • Sugars 22.1 g10%
  • Fibre 7 g3%
  • Other carbs 5.4 g2%
  • Protein 2.5 g1%
  • Fat 0.8 g0%
What's in one serving, by weight — average composition (USDA).
Fiber25%Vitamin C11%Magnesium4%Iron2%Potassium6%Calcium2%
One serving as % of the adult daily requirement (FDA Daily Values). The bold outer ring = 100% of a day's needs.
129 kcal2.5 g protein7 g fiber0.8 g fat
NutrientPer serving% daily value
Fiber7 g25%
Vitamin C9.8 mg11%
Magnesium16 mg4%
Iron0.41 mg2%
Potassium263 mg6%
Calcium20 mg2%
Phosphorus27 mg2%
Sugars22 g0%

Composition data: USDA FoodData Central ↗

What is Dragon Fruit (Pitaya)?

Dragon Fruit (Pitaya) (Hylocereus undatus / H. polyrhizus) is a fruit used for improved endothelial/vascular function (flow-mediated dilation, pulse-wave velocity, arterial stiffness) in a single small controlled human crossover trial using betalain-rich fruit powder. NutriDex grades the human evidence as Preliminary. Dragon fruit is a low-calorie, fiber- and vitamin-C-containing cactus fruit whose red-fleshed varieties are notably rich in betalain pigments and phenolic acids with strong in-vitro antioxidant activity. The strongest human data come from a single double-blind randomized crossover trial (n=18) in which 24 g betalain-rich dragon fruit powder (~33 mg betalains) daily for 14 days improved flow-mediated dilation, acutely reduced pulse-wave velocity, and improved augmentation index, suggesting a real but modest vascular benefit. A 2017 meta-analysis of four small RCTs found a significant fasting-glucose reduction in prediabetes (−15.1 mg/dL) but no significant effect in established type 2 diabetes. Dragon fruit oligosaccharides showed prebiotic and immune (IgA) effects in a rat study and a small human trial, and small trials/reviews hint at favorable lipid changes. However, the overall human evidence base is thin: trials are few, small, short, mostly from a handful of research groups, and heterogeneous in form (fresh fruit vs. powder vs. isolated oligosaccharides). Long-term outcomes and effects from realistic dietary portions of whole fruit remain largely unproven, so claims should be considered preliminary.

Purported Benefits

✓Improved endothelial/vascular function (flow-mediated dilation, pulse-wave velocity, arterial stiffness) in a single small controlled human crossover trial using betalain-rich fruit powder
✓May lower fasting glucose in prediabetes (small meta-analysis); effect in established type 2 diabetes not significant
✓Prebiotic oligosaccharides increased Bifidobacterium and boosted IgA (rat study and a small human trial)
✓High in-vitro antioxidant capacity from betalains and phenolic acids (cell/chemical assays, not human outcomes)
✓Possible favorable lipid changes (LDL/total cholesterol, HDL) suggested by small trials and reviews
✓Modest dietary fiber and vitamin C contribution to digestive and immune support

Dosing & Compounds

Typical Dose
1 medium fruit (~200-230 g) fresh pulp daily; the vascular trial used ~24 g whole-fruit powder (~33 mg betalains)
Active Compounds
Betacyanins (betanin, phyllocactin/6'-O-malonylbetanin, isophyllocactin) — red-flesh pigmentsPhenolic acids (p-coumaric, vanillic, gallic, ferulic acid)Flavonoids (kaempferol, quercetin glycosides)Vitamin C (ascorbic acid)Soluble & insoluble dietary fiberPrebiotic oligosaccharides (dragon fruit oligosaccharides, DFO)Minerals (magnesium, potassium, iron)Betaxanthins (yellow-orange pigments)

Safety & Cautions

Generally safe as a food. Harmless red/pink discoloration of urine and stool (pseudohematuria, beeturia-like) can occur after eating red-fleshed pitaya and may be mistaken for blood. Rare IgE-mediated allergic reactions, including anaphylaxis, have been reported. Large amounts of the prebiotic oligosaccharides or high fiber intake may cause bloating, gas, or loose stools. Theoretical additive effect with glucose-lowering or blood-pressure medications—monitor if consuming large or supplemental quantities. Seeds are eaten whole and pass undigested. Educational only — always check with your doctor or pharmacist before combining Dragon Fruit (Pitaya) with any medicine.

Key Studies

Systematic review Nishikito 2023 ✓ Full text
PRISMA systematic review identifying 5 human trials (all H. polyrhizus) reporting improved glycemia, lipid profile, antioxidant status, and vascular function; concludes human evidence is promising but limited.
Systematic review & meta-analysis Poolsup 2017 ✓ Full text
Systematic review/meta-analysis of 4 RCTs (36 prediabetes, 109 T2DM): significant fasting-glucose reduction in prediabetes (MD -15.1 mg/dL, P=0.0006) but no significant effect in established T2DM (MD -26.5 mg/dL, P=0.26).
Randomized controlled trial Pansai 2023 ✓ Full text
Randomized double-blind placebo-controlled trial in healthy adults: dragon fruit oligosaccharides increased plasma IgA and promoted Bifidobacterium growth, supporting prebiotic and immune effects.
Randomized controlled trial Cheok 2022 ✓ PubMed
Double-blind RCT crossover (n=18): 24 g betalain-rich dragon fruit powder/day (~33 mg betalains) x14 days improved flow-mediated dilation, acutely reduced pulse-wave velocity, and improved augmentation index after 14 days; no change in blood pressure.
Review Bishoyi 2024 ✓ Source
Comprehensive review of H. undatus nutritional composition and phytochemical profile detailing betalains, phenolic acids, flavonoids, fiber, and reported antioxidant, antidiabetic, anti-obesity and lipid-lowering activities.
Review Huang 2021 ✓ Full text
Review of red pitaya maturation, nutritional profile and bioactivities documenting rising betalain, phenolic and flavonoid content with ripening and associated antioxidant and metabolic (glycemic, anti-fatty-liver) effects.
Animal study Pansai 2020 ✓ Source
Prebiotic activity of dragon fruit oligosaccharides demonstrated in rats: selectively increased faecal bifidobacteria and lactobacilli while decreasing bacteroides and clostridia, with immune (IgA/IgG) boosting.
In vitro study Tang 2022 ✓ Full text
Betacyanins/anthocyanins from red pitaya (H. polyrhizus cv. Jindu) pulp and peel inhibited H2O2-induced oxidative stress, reduced lipid accumulation in adipocytes, and showed cytotoxic effects in cell models; peel had higher antioxidant capacity than pulp.
Analytical/metabolomic study Hua 2018 ✓ Source
Metabolite profiling (UPLC-QTOF-MS) of red vs. white pitayas identified phyllocactin (6'-O-malonylbetanin) and related betacyanins in red pitaya, correlating with higher antioxidant activity vs. white pitaya.
9 sources cited · 9 verified Search all studies on PubMed ↗

Common questions about Dragon Fruit (Pitaya)

What is Dragon Fruit (Pitaya) used for?

Dragon Fruit (Pitaya) is most often taken for Improved endothelial/vascular function (flow-mediated dilation, pulse-wave velocity, arterial stiffness) in a single small controlled human crossover trial using betalain-rich fruit powder, May lower fasting glucose in prediabetes (small meta-analysis); effect in established type 2 diabetes not significant, Prebiotic oligosaccharides increased Bifidobacterium and boosted IgA (rat study and a small human trial), High in-vitro antioxidant capacity from betalains and phenolic acids (cell/chemical assays, not human outcomes). Betalain-rich cactus fruit for vascular health

Does Dragon Fruit (Pitaya) work — what does the evidence say?

Preliminary evidence. Early or small human trials; promising but not yet conclusive. Dragon fruit is a low-calorie, fiber- and vitamin-C-containing cactus fruit whose red-fleshed varieties are notably rich in betalain pigments and phenolic acids with strong in-vitro antioxidant activity. The strongest human data come from a single double-blind randomized crossover trial (n=18) in which 24 g betalain-rich dragon fruit powder (~33 mg betalains) daily for 14 days improved flow-mediated dilation, acutely reduced pulse-wave velocity, and improved augmentation index, suggesting a real but modest vascular benefit. A 2017 meta-analysis of four small RCTs found a significant fasting-glucose reduction in prediabetes (−15.1 mg/dL) but no significant effect in established type 2 diabetes. Dragon fruit oligosaccharides showed prebiotic and immune (IgA) effects in a rat study and a small human trial, and small trials/reviews hint at favorable lipid changes. However, the overall human evidence base is thin: trials are few, small, short, mostly from a handful of research groups, and heterogeneous in form (fresh fruit vs. powder vs. isolated oligosaccharides). Long-term outcomes and effects from realistic dietary portions of whole fruit remain largely unproven, so claims should be considered preliminary.

What is the typical dose of Dragon Fruit (Pitaya)?

1 medium fruit (~200-230 g) fresh pulp daily; the vascular trial used ~24 g whole-fruit powder (~33 mg betalains)

Is Dragon Fruit (Pitaya) safe? Any cautions or side effects?

Generally safe as a food. Harmless red/pink discoloration of urine and stool (pseudohematuria, beeturia-like) can occur after eating red-fleshed pitaya and may be mistaken for blood. Rare IgE-mediated allergic reactions, including anaphylaxis, have been reported. Large amounts of the prebiotic oligosaccharides or high fiber intake may cause bloating, gas, or loose stools. Theoretical additive effect with glucose-lowering or blood-pressure medications—monitor if consuming large or supplemental quantities. Seeds are eaten whole and pass undigested.

How many studies support Dragon Fruit (Pitaya)?

NutriDex cites 9 sources for Dragon Fruit (Pitaya), graded "Preliminary".

Cite this page
APA

Peh, D. (2026). Dragon Fruit (Pitaya) (Hylocereus undatus / H. polyrhizus): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/dragon-fruit-pitaya

BibTeX
@misc{nutridex_dragon_fruit_pitaya,
  author       = {Peh, Daryl},
  title        = {Dragon Fruit (Pitaya) (Hylocereus undatus / H. polyrhizus): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/dragon-fruit-pitaya},
  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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