Evidence tier
Moderate
Research weight
Citations
13 verified / 13
Classification
Fruits
❝
What the evidence says. Several controlled trials; effects real but modest or context-dependent.
Nutrition per serving 1 cup cubes (145 g)
- Water 128 g88%
- Sugars 11.3 g8%
- Fibre 2.5 g2%
- Other carbs 1.9 g1%
- Protein 0.7 g0%
- Fat 0.4 g0%
62 kcal0.68 g protein2.5 g fiber0.38 g fat
| Nutrient | Per serving | % daily value |
|---|---|---|
| Vitamin C | 88 mg | 98% |
| Folate | 54 mcg | 13% |
| Vitamin A (RAE) | 68 mcg | 8% |
| Potassium | 264 mg | 6% |
| Fibre | 2.5 g | 9% |
| Magnesium | 31 mg | 7% |
| Beta-carotene | 397 mcg | 0% |
| Vitamin E | 0.44 mg | 3% |
| Calcium | 29 mg | 2% |
Composition data: USDA FoodData Central ↗
What is Papaya?
Papaya (Carica papaya) is a fruit used for excellent vitamin c source supporting antioxidant defence and immune function. NutriDex grades the human evidence as Moderate. Direct human trials on papaya as a whole fruit are sparse; most evidence is indirect, drawn from its constituent nutrients. Large prospective cohorts and dose-response meta-analyses consistently link higher total fruit and vegetable intake, dietary vitamin C, and carotenoids (lycopene, lutein/zeaxanthin) with lower cardiovascular mortality, modestly reduced prostate-cancer risk, and higher macular pigment density. These associations are observational and reflect overall dietary patterns rather than papaya specifically, so causal attribution to papaya alone is not established. Small RCTs of fermented papaya preparations show modest improvements in oxidative-stress and metabolic markers, but these are proprietary processed extracts, not fresh fruit, and effects on hard clinical endpoints are unproven. Overall the weight of human evidence supporting papaya's benefits is moderate, grounded in nutrient-level cohort data rather than fruit-specific trials.
Purported Benefits
✓Excellent vitamin C source supporting antioxidant defence and immune function
✓Provides provitamin-A carotenoids (beta-carotene) and lycopene linked to cardiovascular and prostate-cancer risk reduction in cohorts
✓Supplies lutein and zeaxanthin relevant to macular pigment and eye health
✓Soluble and insoluble fibre supporting digestive regularity and satiety
✓Low energy density with high water content, useful for weight-conscious diets
✓Potassium contributes to healthy blood pressure as part of a fruit-rich diet
Dosing & Compounds
Typical Dose
A typical serving is 1 cup of cubes (about 145 g) or roughly half a small papaya, providing nearly a full day's vitamin C. Whole-diet patterns associate higher total fruit and vegetable intake (up to ~800 g/day) with lower cardiovascular and all-cause mortality; papaya counts toward this without a fruit-specific intake threshold.
Active Compounds
Safety & Cautions
Papaya can trigger allergy in latex-sensitised individuals (latex-fruit syndrome) via cross-reactive class-I chitinases; papain and chymopapain are also recognised allergens and occupational sensitisers. Unripe (green) papaya and high-dose papaya leaf/seed extracts contain papain and carpaine and are traditionally avoided in pregnancy because of theoretical uterotonic/abortifacient effects. The natural sugar load (~11 g per cup) is modest but counts for those managing blood glucose. Papain-containing supplements may theoretically potentiate anticoagulants such as warfarin. Fresh ripe papaya in normal culinary amounts is generally well tolerated. Educational only — always check with your doctor or pharmacist before combining Papaya with any medicine.
Key Studies ★ 13 studies
Systematic review
Wilson 2021
✓ PubMed
Systematic review/meta-analysis (46 studies, 3,189 participants): lutein/zeaxanthin intake of 5-20+ mg/day increases macular pigment optical density; doses below 5 mg/day showed no significant change.
Meta-analysis
Aune 2017
✓ PubMed
Dose-response meta-analysis (95 studies): higher fruit and vegetable intake associated with lower cardiovascular disease, cancer, and all-cause mortality (RR 0.90 per 200 g/day for all-cause mortality), with benefit up to ~800 g/day.
Meta-analysis
Jayedi 2019
✓ PubMed
Dietary vitamin C linked to 21% lower CVD mortality (RR 0.79) and higher circulating vitamin C to 40% lower (RR 0.60).
Meta-analysis
Wang 2015
✓ PubMed
Dietary and blood lycopene inversely associated with overall prostate cancer risk (RR 0.86 and 0.81; ~3% lower risk per 1 mg/day dietary lycopene), though no protection seen for advanced disease.
Meta-analysis
Rajapakse 2019 (meta-analysis)
✓ Full text
Systematic review/meta-analysis of 9 trials found C. papaya leaf extract associated with increased platelet count (mean difference 20.27, 95% CI 6.21-34.73; P=0.005), but judged evidence insufficient to recommend it for dengue given unclear clinical benefit.
RCT
J Frailty Aging 2018 (FPP RCT)
✓ PubMed
Randomized placebo-controlled crossover trial of Fermented Papaya Preparation in 29 adults aged 70-100 found no adverse changes in blood chemistries and no serious adverse effects, supporting safety/feasibility of FPP supplementation in older adults.
RCT
Somanah 2012
✓ PubMed
RCT in neo-diabetics: 6 g/day fermented papaya preparation for 14 weeks improved oxidative-stress and metabolic biomarkers (e.g., reduced CRP, improved LDL/HDL and uric acid).
Review
Sunday 2026
✓ PubMed
Systematic review of plant-based therapies for the management of sickle cell anaemia.
Review
Rick 2026
✓ PubMed
Allergens from plant-based food allergen sources and their clinical and diagnostic relevance
Review
Pathogens Glob Health 2025
✓ PubMed
2025 review of Carica papaya leaf extract for dengue thrombocytopenia concludes CPLE shows promising platelet-count increases and shorter hospital stays, but existing trials have methodological flaws preventing a firm clinical recommendation.
Review
Sharma 2023
✓ PubMed
Review of antiviral and platelet-protective properties of Carica papaya in dengue summarizes proposed mechanisms (platelet membrane stabilization, reduced platelet destruction, inhibition of viral assembly) underlying observed platelet recovery.
Observational
Nutrients 2024
✓ Full text
Preclinical (HepG2 cell) study showing Carica papaya leaf and root extracts promote glucose uptake and antioxidant defence under hyperglycaemic oxidative stress; mechanistic support but no human outcomes.
Review
Diaz-Perales 1999
✓ PubMed
Class-I chitinases identified as relevant cross-reactive allergens underlying latex-fruit syndrome, including papaya.