Vitamin B12 Shows Mixed Results for Heart Health
A new review in Nutrition Journal finds B12 supplements do not consistently prevent major cardiovascular events, though stroke prevention shows the strongest signal.
Updated on Nov. 2, 2026 in Nutrition
Live Poll
Do you take a vitamin B12 supplement for your heart health?
A new review published in Nutrition Journal found that vitamin B12 supplementation does not consistently prevent major cardiovascular events. The strongest evidence of potential clinical benefit was found in stroke prevention.
Why it matters
Cardiovascular disease is the leading cause of death worldwide, and many people take vitamin supplements in hopes of protecting their heart. The findings suggest B12 should not be assumed to broadly reduce heart disease risk.
The review synthesizes existing evidence rather than presenting a single new trial, with its conclusions drawn from prior research on B12 and cardiovascular outcomes. Specific effect sizes and participant numbers were not included in the source extraction, leaving the strength of the stroke-prevention signal unquantified.
The players
Nutrition Journal
A peer-reviewed scientific journal that publishes research on nutrition science and its relationship to human health.
The details
Researchers reviewed existing evidence on vitamin B12 supplementation and cardiovascular outcomes, following earlier work on vitamin C, E, D, and B12 and heart disease risk. The review found B12 may affect heart health in certain ways, but the benefit was not consistent across major cardiovascular events.
Timeline
Medical News Today published an article on the vitamin B12 review on November 2, 2026.
Big Picture
Earlier studies on vitamin C, vitamin E, vitamin D, and vitamin B12 explored whether these nutrients could lower heart disease risk, and this review narrows that question to B12. Its mixed results add to a body of research that has repeatedly failed to show broad cardiovascular protection from individual vitamin supplements.
Readers taking B12 supplements for heart protection should not assume the supplement reliably prevents major cardiovascular events. The strongest signal was for stroke prevention, so the benefit may be narrower than commonly expected.
The takeaway
Supplements are not a substitute for established heart-health measures, and any decision about B12 should be discussed with a clinician. The evidence points to stroke as the most promising area rather than broad heart protection.
Further reading
Explore more on Nutrition to see how supplements and diet relate to heart health.
Source note: This article includes information reported by Medicalnewstoday.
Live Poll
Do you take a vitamin B12 supplement for your heart health?
