Red spinach extract and endurance
What 2 graded rows on red spinach extract agree on for endurance, and where they differ. Counted side by side, never averaged.
Consensus finder Rows from the Red spinach extract page, reviewed Oct 21, 2026 How it decides
What the rows agree on
Each block and row is one graded row from the Red spinach extract page, with its PubMed record.
Your question
Red spinach extract and endurance
2 rows · 32 peopleSplit. 1 row found an improvement and 1 had mixed results.
- DGrade D× 2
- Rows
- 2
- Trials
- 2
- People
- 32
What the rows share
From the rowsThe best-graded row, grade D, is a randomized trial of 17 people (2021) and found an improvement.
The rows run from 15 to 17 people, published from 2017 to 2021: 2 single studies.
The rows
1 improved · 1 mixed- DGrade D4-km cycling time trial · Improved
RCT · n 17 · 2021 · Recreationally active men and women (9 men, 8 women; USA)
1 g/day · 7 days
The 4-km time trial was completed faster (404.6 vs 410.6 seconds, p=0.013) with higher average power (p=0.022) than with placebo; perceived exertion and muscle fatigue did not differ.
Row on the Red spinach extract page · PubMed 31136549 (opens PubMed)
- DGrade DOxygen uptake at ventilatory threshold during a graded exercise test · Mixed
Crossover RCT · n 15 · 2017 · Recreationally active young adults (USA)
1,000 mg once, about 70 minutes before testing · Single dose
Oxygen uptake at the ventilatory threshold was 6.1% higher than placebo, but time to exhaustion and peak oxygen uptake did not improve (both slightly lower, not significant).
Row on the Red spinach extract page · PubMed 29910440 (opens PubMed)