Folic acid and vitamin b6 supplementation
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Folic Acid and Vitamin B6 Supplementation: Effects on Homocysteine and Cardiovascular Health
Research shows that folic acid supplementation, either alone or combined with vitamin B6, can lower plasma homocysteine levels, which are linked to cardiovascular risk. In healthy young women, folic acid supplementation reduced homocysteine by 11.5%, and the combination with vitamin B6 led to a 17% reduction. However, vitamin B6 alone did not have a significant effect on homocysteine levels within the normal range .
Meta-analyses indicate that combined supplementation with folic acid, vitamin B6, and vitamin B12 can significantly reduce the risk of stroke, especially in areas without or with only partial folic acid fortification. The most effective dosages for stroke prevention appear to be folic acid ≤0.8 mg/day and vitamin B12 ≤0.4 mg/day. However, these combinations do not significantly reduce the risk of other cardiovascular events or myocardial infarction Zhang2024Lan2016. Some evidence suggests that moderate doses of vitamin B6 (5–10 mg/day) combined with folic acid may reduce the risk of coronary revascularization, but higher doses of folic acid do not provide additional benefit and may even increase risk .
Supplementation and Inflammation in Diabetic Neuropathy
In patients with diabetic neuropathy, co-supplementation of folic acid, vitamin B6, and vitamin B12 significantly decreased inflammation, as measured by serum Hs-CRP levels. This suggests a potential benefit for reducing inflammation in this population .
Effects on Pregnancy Outcomes
For women with a history of preeclampsia or fetal growth restriction and hyperhomocysteinemia, supplementation with folic acid and vitamin B6 normalized methionine metabolism and was associated with improved perinatal outcomes, including higher birth weights in subsequent pregnancies .
Cognitive Function and Depression
Multiple studies and systematic reviews have found that supplementation with folic acid and vitamin B6, alone or in combination with vitamin B12, does not improve cognitive function or reduce the risk of cognitive impairment or dementia in older adults Ford2010Balk2007. Similarly, long-term, high-dose supplementation did not reduce the risk of depression in older women, despite lowering homocysteine levels .
Bone Health and Fracture Risk
Long-term supplementation with folic acid, vitamin B6, and vitamin B12 does not reduce the risk of nonspine fractures or affect bone turnover markers in middle-aged and older women at high risk of cardiovascular disease .
Conclusion
Folic acid and vitamin B6 supplementation, especially when combined with vitamin B12, can lower homocysteine levels and reduce stroke risk, particularly in populations without widespread folic acid fortification. There is also evidence for reduced inflammation in diabetic neuropathy and improved pregnancy outcomes in women with certain risk factors. However, these supplements do not appear to benefit cognitive function, depression risk, or bone health in older adults. The most consistent benefits are seen in homocysteine reduction and stroke prevention, with optimal effects at moderate dosages.
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Most relevant research papers on this topic
Folic acid and Vitamin B6 supplementation and plasma homocysteine concentrations in healthy young women.
Low-dose vitamin supplementation with folic acid can lower homocysteine levels within the normal range in healthy young women, but vitamin B6 has no effect.
Effect of long-term supplementation with folic acid and B-vitamins on risk of depression in older women
Long-term, high-dose, daily supplementation with folic acid and vitamins B6 and B12 did not reduce overall depression risk in mid-life and older women.
Vitamins B12, B6, and folic acid for cognition in older men
Daily supplementation with vitamins B12, B6, and folic acid does not improve cognitive function or reduce the risk of cognitive impairment or dementia in hypertensive men aged 75 and older.
Vitamin B6, B12, and folic acid supplementation and cognitive function: a systematic review of randomized trials.
Vitamin B6, B12, and folic acid supplementation shows no significant effect on cognitive function in people with normal or impaired cognitive function.
Effect of Combination Folic Acid, Vitamin B6, and Vitamin B12 Supplementation on Fracture Risk in Women: A Randomized, Controlled Trial
Daily supplementation with folic acid, vitamin B6, and vitamin B12 does not significantly reduce fracture risk or bone metabolism in middle-aged and older women at high risk of cardiovascular disease.
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