Vitamin B-12 supplementation improves arterial function in vegetarians with subnormal vitamin B-12 status
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Vegetarians are more vascular-healthy but those with subnormal vitamin B-12 status have impaired arterial endothelial function and increased intima-media thickness. We aimed to study the impact of vitamin B-12 supplementation on these markers, in the vegetarians.
Double-blind, placebo controlled, randomised crossover study.
Community dwelling vegetarians.
Fifty healthy vegetarians (vegetarian diet for at least 6 years) were recruited. Intervention: Vitamin B-12 (500µg/day) or identical placebo were given for 12 weeks with 10 weeks of placebo-washout before crossover (n=43), and then open label vitamin B-12 for additional 24 weeks (n=41).
How-mediated dilation of brachial artery (FMD) and intima-media thickness (IMT) of carotid artery were measured by ultrasound.
The mean age of the subjects was 45+9 years and 22 (44%) were male. Thirty-five subjects (70%) had serum B-12 levels <150pmol/l. Vitamin B-12 supplementation significantly increased serum vitamin B-12 levels (p<0.0001) and lowered plasma homocysteine (p<0.05). After vitamin B-12 supplementation but not placebo, significant improvement of brachial FMD (6.3±1.8% to 6.9±1.9%; p<0.0001) and in carotid IMT (0.69±0.09mm to 0.67±0.09 mm, p<0.05) were found, with further improvement in FMD (to 7.4±1.7%; p<0.0001) and IMT (to 0.65±0.09mm; p<0.001) after 24 weeks open label vitamin B-12. There were no significant changes in blood pressures or lipid profiles. On multivariate analysis, changes in B-12 (β=0.25; p=0.02) but not homocysteine were related to changes in FMD, (R=0.32; F value=3.19; p=0.028).
Vitamin B-12 supplementation improved arterial function in vegetarians with subnormal vitamin B-12 levels, proposing a novel strategy for atherosclerosis prevention.
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- Vitamin B-12 supplementation improves arterial function in vegetarians with subnormal vitamin B-12 status
The journal of nutrition, health & aging
Volume 16, Issue 6 , pp 569-573
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- vitamin B-12
- endothelial function
- intima-media thickening
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- Author Affiliations
- 1. Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, China
- 2. School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China
- 3. Department of Diagnostic Radiology and Organ Imaging, The Chinese University of Hong Kong, Hong Kong, China
- 4. Department of Cardiology, The University of Sydney, Sydney, Australia
- 5. Room 191, Science Centre South Block, Biochemistry Programme, School of Life Sciences, The Chinese University of Hong Kong, Shatin NT, Hong Kong SAR, China