Further studies are needed to confirm these results. In conclusion, folic acid might have a favourable effect on endothelial function but may not affect arterial stiffness. There were significant differences between the effect of folic acid and placebo on flow-mediated dilation (random-effects model, standardized mean differences (SMD): 0.888, 95% confidence interval (CI): 0.447, 1.329, p < 0.001) and monocyte chemotactic protein 1 (random-effects model, SMD: −1.364, 95% CI: −2.164, −0.563, p < 0.001), but there was no significant difference in the central pulse wave velocity (fixed-effects model, SMD: −0.069, 95% CI: −0.264, 0.125, p = 0.485) and peripheral pulse wave velocity (fixed-effects model, SMD: −0.093, 95% CI: −0.263, 0.077, p = 0.284). The PubMed, Web of Sciences, Cochrane and Scopus databases were searched to identify English-language randomised controlled trials of the effect of folate supplementation on arterial stiffness and endothelial function markers in adults. The study protocol was registered with the PROSPERO database (CRD42021290195). This systematic review evaluated the effect of folic acid supplementation on endothelial parameters and arterial stiffness in adults. Folic acid might improve endothelial function, but the results are inconclusive.
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