Summary and Conclusion: Vitamin B6
- The primary physician should screen patients at risk for hyperhomocysteinemia (high homocysteine level) by sending a blood test for homocysteine level. A meta-analysis by Herrmann W, et al found that lowering homocysteine with folic acid, vitamin B6, and vitamin B12 showed a tendency toward lowering the risk of stroke (1).
- A prevention evaluation by Saposnik G, et al in the HOPE-2 trail demonstrated that 2.5 mg. of folic acid (vitamin B9), 50 mg vitamin B6 and 1mg of vitamin B12 daily for 5 years reduced the risk of stroke by 25%. Interestingly, no noticeable effect was observed during the first 3 years of the supplements. The risk of stroke was lower in those who followed the vitamin regimen. Those who benefited the most included: younger than age 69, patients with higher cholesterol and homocysteine levels at the start of the study, those from areas where folic acid-fortified food isn’t available, and those who weren’t receiving anti-platelet drugs or cholesterol-lowering drugs. (2)
- Vitamin B6 is useful for treating sideroblastic anemia (4).
- Mintzer S, et al found that 48% of subjects taking antiepileptic drugs were vitamin B6 deficient (5).
- Patients with lower B12 levels and higher homocysteine levels had more severe depression than those with normal levels. (6)
- Ensure adequate intake of vitamin B6 in pregnancy. Vitamin B6 deficiency has been associated with early gestational diabetes, neurologic disease in babies, pre-eclampsia, and hyperemesis gravidarum (7).
- To enhance vitamin B6 intake from foods, see the following links: Nutritive Value of Foods, United States Department of Agriculture, Agricultural Research Service, Home and Garden Bulletin Number 72. May be accessed at: https://www.ars.usda.gov/SP2UserFiles/Place/12354500/Data/SR25/nutrlist/sr25w415.pdf and http://www.nal.usda.gov/fnic/foodcomp/Data/HG72/hg72_2002.pdf