marginally significantP =0.076
When the RCTs were stratified according to the duration of supplementation, there was no significant effect in the subsets of studies lasting <8 weeks (WMD: −2.18 mm Hg, 95% CI: −5.00, 0.64, P =0.130), while a marginally significant reducing effect was observed in trials with ≥8 weeks of follow‐up (WMD: −3.57 mm Hg, 95% CI: −7.51, 0.37, P =0.076).