Folic acid supplementation benefits
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Folic Acid Supplementation and Cardiovascular Health
Folic acid supplementation has been shown to provide several cardiovascular benefits, particularly in reducing the risk of stroke. Large meta-analyses and systematic reviews consistently report that folic acid supplementation lowers the risk of stroke by about 10% in the general population, with even greater benefits observed in regions without grain fortification and among individuals without a history of stroke or myocardial infarction Zhang2024Li2016Martínez2024. Additionally, folic acid supplementation is associated with a modest reduction in overall cardiovascular disease risk, especially in people with lower baseline folate levels and those without preexisting cardiovascular disease . Some evidence also suggests a reduction in cardiovascular mortality among post-myocardial infarction patients . Folic acid’s cardiovascular benefits are largely attributed to its ability to lower homocysteine levels, a known risk factor for vascular disease . However, its effect on coronary heart disease and peripheral arterial disease appears limited Li2016Martínez2024Hashim2024.
Folic Acid and Glycemic Control
Folic acid supplementation has demonstrated small but significant improvements in glycemic control markers, including reductions in fasting blood glucose, fasting insulin, and insulin resistance (HOMA-IR) in adults . While these changes are statistically significant, their clinical impact for adults with type II diabetes may be limited. Animal studies further support these findings, showing that folic acid supplementation can improve insulin resistance, reduce fat mass, and induce beneficial changes in gene expression related to obesity and insulin secretion .
Cognitive Function and Inflammation in Older Adults
In elderly individuals with mild cognitive impairment, folic acid supplementation has been found to improve several aspects of cognitive function, such as full-scale IQ and specific cognitive tasks . It also appears to reduce inflammatory cytokines and blood biomarkers associated with Alzheimer’s disease, although more high-quality studies are needed to confirm these effects .
Antioxidant Effects of Folic Acid
Folic acid supplementation enhances the body’s antioxidative defense system by increasing serum concentrations of glutathione and total antioxidant capacity, while reducing levels of malondialdehyde, a marker of oxidative stress . These changes suggest that folic acid may help protect against oxidative damage, which is implicated in the development of various chronic diseases.
Lipid Profile and Atherosclerosis
Evidence suggests that folic acid supplementation may modestly improve plasma lipid levels and reduce lipid atherogenicity, potentially lowering the risk of early vascular damage and cerebrovascular disease . Given its low cost and high safety profile, long-term folic acid supplementation could be considered for patients with dyslipidemia as part of secondary prevention strategies for cardiovascular disease .
Homocysteine Reduction and Vascular Health
Folic acid is a key dietary factor in lowering homocysteine levels, which are linked to increased risk of coronary artery disease and other vascular conditions. Supplementation with 0.5–5.0 mg of folic acid daily can reduce plasma homocysteine by about 25%, and is recommended for individuals with elevated homocysteine to help prevent vascular disease and related complications .
Conclusion
Folic acid supplementation offers a range of health benefits, including reduced risk of stroke and cardiovascular mortality, improved glycemic control, enhanced cognitive function in older adults, and strengthened antioxidant defenses. Its ability to lower homocysteine and modestly improve lipid profiles further supports its role in cardiovascular and metabolic health. While the magnitude of some benefits may be modest, folic acid’s safety, affordability, and broad effects make it a valuable supplement, especially for individuals at higher risk of vascular disease or with low baseline folate levels.
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