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Little Vitamin D does not reduce risk of CVD – RCT meta-analysis Dec 2023

Vitamin D Supplementation and Cardiovascular Disease Risks in More Than 134 000 Individuals in 29 Randomized Clinical Trials and 157 000 Individuals in 30 Prospective Cohort Studies: An Updated Systematic Review and Meta­analysis

Res Health Sci. 2023; 23(4):e00594. doi:10.34172/jrhs.2023.129
Mohammad Aziz Rasouli (MSc)1,2|S, Shahram Darvishzadehdaledari (MSc)3, Zeynab Alizadeh (Ph. D)4, Ghobad Moradi (MD, Ph. D)1,2, Fatemeh Gholami (Ph. D)2,4* , Ako Mahmoudian (MD)5 department of Epidemiology and Biostatistics, Faculty of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran
2 Social Determinants of Health Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran department of Health Sciences, University of York, Heslington, York, YO 10 DD, United Kingdom department of Epidemiology, School of Public Health, Iran University of Medical Sciences, Tehran, Iran 5 Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran

Only 1 RCT used more than 3,300 IU of Vitamin D3 daily
Background: According to the findings from observational studies and clinical trials assessing the effect of vitamin D supplements on cardiovascular diseases (CVDs), there are still contradictory results. This systematic review aimed to assess the effect of vitamin D supplements on CVDs considering cohort studies and clinical trials.

Study Design: A systematic review.

Methods: MEDLINE/PubMed, Science Direct, Embase, and Cochrane Library databases were reviewed by two reviewers independently until 2022. The study effect is risk ratio (RR) and 95% confidence interval (CI) according to Mantel Haenszel's random-effects model. Then, Stata version 14 was used for statistical analysis.

Results: In clinical trial studies, the incidence of CVDs among the vitamin D-consuming group was not significantly different from that in the placebo group (RR: 0.99, 95% CI: 0.95-1.03; P = 0.77; I2 = 0%). CVD mortality was also not significantly different between the two groups (RR: 0.97, 95% CI: 0.90-1.05; P = 0.72; I2 = 0%). In cohort studies, circulating 25 (OH) D increased the risk of CVD incidence by 31% (RR: 1.31, 95% CI: 1.19-1.45) and CVD mortality by 37% (RR: 1.37, 95% CI: 1.17-1.61).

Conclusion: According to current evidence from clinical trials, vitamin D supplementation should not be recommended for CVD prevention. However, there is a direct association between vitamin D deficiency and the incidence of CVDs as well as its mortality. According to the results of clinical trial studies carrying higher levels of scientific evidence, it can be concluded that vitamin D supplementation does not exert a significant effect on the incidence, mortality, and reduction of CVDs.
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Attached files

ID Name Comment Uploaded Size Downloads
20773 CVD RTC.png admin 08 Feb, 2024 287.37 Kb 29
20772 CVD meta_CompressPdf.pdf admin 08 Feb, 2024 378.97 Kb 6