100% watermelon juice,
does it really help with Improved vascular function in healthy postmenopausal women?
research showsThe grade is D with 30 points. Twenty-one healthy postmenopausal women were randomized and 17 completed the crossover trial; some serum analyses included only 16. Drinking 720 mL of 100% watermelon juice daily for four weeks did not change flow-mediated dilation, pulse-wave velocity, ambulatory blood pressure, or pulse pressure. Between-treatment confidence intervals were not reported.
ads claimCitrulline's role in nitric-oxide production is established biochemistry. It did not translate into improved flow-mediated dilation or arterial stiffness in this trial.
Useful facts when choosing a product
- The daily 720-mL juice dose contained measured amounts of 14.4+/-0.34 mg lycopene, 1.15 g arginine, and 1.63 g citrulline.
- Citrulline contributes to nitric-oxide production through arginine metabolism. That biochemical role is separate from demonstrated vascular benefit.
- Watermelon originated in Africa and reached China between the Five Dynasties and Song periods. No classical source text was checked for this verdict.
Chamgap Semantic Classification Code
Candidate index · review held
F.100-percent-watermelon-juice.food.vascular-function.improve.placeboFoods and beverages > 100% watermelon juice > Food consumption > vascular function > Improvement claim > Placebo
An automated migration candidate, not an issued permanent code; exact claim scope remains under review. This machine-generated migration candidate helps retrieval but is not a permanent assignment. The original verdict ID and URL remain authoritative.
What the research actually shows
Twenty-one healthy postmenopausal women were randomized, 17 completed both four-week watermelon-juice and isocaloric-placebo periods separated by a two-week washout, and some serum analyses included 16. NCT03626168 listed serum lycopene, flow-mediated dilation, and pulse-wave velocity as main outcomes, matching the paper. Registration was retrospective, and the current record labels the study non-randomized, conflicting with the paper's randomized crossover design. American Heart Association and NIH-related grants funded the work. Frey Farms supplied juice but was not listed as a funding source.
Why this is classified as D (30)
Every vascular surrogate was null in one small short crossover trial, while missing confidence intervals prevent exclusion of meaningful benefit. This gives D with 30 points.
Counterpoint. Missing intervals leave some room for benefit, but the most direct trial was null across all vascular outcomes.
Rejudgment record. Cross-check applied — All vascular surrogates null in a 21-person four-week crossover trial with no between-treatment confidence intervals
| Endpoint | S | Surrogate marker - laboratory or imaging measures |
| Replication | R1 | Single confirmatory trial |
| Independence | I2 | Decisive evidence is publicly or non-profit funded |
| Effect size | E0 | Null |
| Precision | CX | No pooled confidence interval could be confirmed |
Stored derived and displayed grades match; this is not a current recalculation or validity check (D).
Sub-claim grades by effect
This ingredient is marketed for several effects. A single overall grade blends strong and weak claims together, so each effect is graded separately here. The overall grade reflects the strongest disconfirming or core claim.
| Effect (sub-claim) | Grade | Basis |
|---|---|---|
| Improved vascular function with 100% watermelon juice | D | All vascular outcomes were null in the four-week crossover trial. |
Cross-check — AI research and Codex final gate
Evidence Table
| Study | Design | Sample | Funding | Endpoint | Result | Weight |
|---|---|---|---|---|---|---|
| Ellis et al. 2021 | Double-blind randomized isocaloric-placebo four-week crossover trial | 21 healthy postmenopausal women randomized; 17 completed; some serum analyses included 16 | American Heart Association and NIH-related grants; juice supplied by Frey Farms | Flow-mediated dilation, pulse-wave velocity, ambulatory blood pressure, and pulse pressure | All null; between-treatment CIs not reported; fasting glucose rose modestly | All registered vascular outcomes null |
Receipt — 2 References
All 2 cited sources were verified for existence at the original page (as of 2026-08-02).
Final verification and publication gate: Codex · Evidence date: 2026-08-02 · Corrections: none
Cite this verdict
[Chamgap] 100% watermelon juice x vascular function in healthy postmenopausal women — Evidence Grade D·30. 2 cited sources checked. Source: https://chamgap.com/en/verdicts/heart/watermelon-juice-postmenopausal-vascular-function/ · CC BY 4.0CC BY 4.0 — free to use with attribution; do not distort grades, numbers, or verdict meaning.
What this document does and does not do
Chamgap is an information source. It reports what research has and has not confirmed; it does not tell readers what to take or buy. That decision belongs to readers and, when needed, medical or legal professionals. This verdict reflects literature available up to the search date and may change as new research appears. Nothing here is medical advice.