Association between Serum Vitamin C and the Blood Pressure: A Systematic Review and Meta-Analysis of Observational Studies.

Background: Hypertension is regarded as a major and independent risk factor of cardiovascular diseases, and numerous studies observed an inverse correlation between vitamin C intake and blood pressure.
Aim: Our aim is to investigate the relationship between serum vitamin C and blood pressure, including the concentration differences and the correlation strength.
Method: Two independent researchers searched and screened articles from the National Library of Medicine, Cochrane Library, Web of Science, China National Knowledge Infrastructure, VIP databases, and WANFANG databases. A total of 18 eligible studies were analyzed in the Reviewer Manager 5.3 software, including 14 English articles and 4 Chinese articles.
Results: In the evaluation of serum vitamin C levels, the concentration in hypertensive subjects is 15.13  μ mol/L lower than the normotensive ones (mean difference = -15.13, 95% CI [-24.19, -6.06], and P = 0.001). Serum vitamin C has a significant inverse relation with both systolic blood pressure (Fisher's  Z = -0.17, 95% CI [-0.20, -0.15], P < 0.00001) and diastolic blood pressure (Fisher's  Z = -0.15, 95% CI [-0.20, -0.10], P < 0.00001).
Conclusions: People with hypertension have a relatively low serum vitamin C, and vitamin C is inversely associated with both systolic blood pressure and diastolic blood pressure.
Competing Interests: The authors declare that there are no conflicts of interests regarding the publication of this paper.
(Copyright © 2020 Li Ran et al.)