Blood pressure
Beetroot juice and blood pressure: the effect vanishes when you stop measuring in a clinic
A 2024 meta-analysis of 11 trials and 349 people with hypertension found systolic blood pressure down 5.31 mmHg — and a certainty of evidence rated low. A 2017 analysis found the effect only in clinic measurements, with nothing in 24-hour ambulatory monitoring. That is the whole story in two papers.