Researchers say B vitamins could be worth studying for hard-to-manage blood pressure

Researchers say B vitamins may deserve closer study as a possible add-on for people whose blood pressure is difficult to bring under control. Their idea focuses on reducing homocysteine, a compound involved in normal metabolism that can build up when certain vitamin-dependent pathways are not working well.

That issue is especially relevant for patients whose blood pressure stays high even after taking several medications. While another treatment option would be welcome, the evidence discussed here does not show that a standard B-complex supplement can reliably treat resistant hypertension.

The potential appeal is a low-cost approach that might help some patients alongside standard care. But that should not be confused with a proven recommendation to replace blood pressure medicine with vitamins or to start high-dose supplements without medical supervision.

University of Maine researcher Merrill Elias and University of Arkansas for Medical Sciences collaborator Craig Brown reviewed the evidence in an editorial for the American Journal of Hypertension. The piece did not report a new randomized trial; it examined earlier studies published online in 2021.

Homocysteine is formed as the body breaks down amino acids, which are the building blocks of proteins. Vitamins such as riboflavin, or B2, B6, folate and B12 help support the pathways that process it, and genetic differences can also affect its level.

Elevated homocysteine has been linked to problems with blood vessels and cardiovascular disease. One possible explanation involves nitric oxide, a substance that helps blood vessels relax, although an observed association does not by itself prove that lowering homocysteine will improve every related health outcome.

The authors said earlier criticism of homocysteine-lowering treatment may have been too quick. They pointed to research suggesting that proper vitamin therapy could reduce blood pressure by as much as six to 13 millimeters of mercury in some settings.

Those numbers should not be read as the average result from a single large trial in patients with resistant hypertension. The editorial brought together different findings and interpretations, leaving open questions about which patients may benefit, which formulations matter and how consistent the improvement would be.

The authors also raised concerns about how laboratories define a normal homocysteine range. Their case for lower reference values is part of an ongoing scientific discussion, not a reason for readers to interpret a lab result or choose treatment on their own.

Safety is also important. Vitamin B6 supplements can damage nerves, and using multiple products can raise total intake; large amounts of supplemental folate can also hide blood changes linked to vitamin B12 deficiency while neurological harm continues.

For someone having trouble controlling blood pressure, the best next step is a careful review of readings, medications and possible contributing conditions. A clinician can decide whether nutritional evaluation or additional testing is needed, while vitamin-based strategies remain a matter for individualized care and stronger evidence.

If you are interested in this topic, please read articles about Too much vitamin B6 can be toxic. 3 symptoms to watch out for, and The DASH diet is a simple way to lower high blood pressure.

For more information, please see articles about Here’s what you need to know about vitamin D, and What should know about high blood pressure drugs and their side effects.

Source: University of Maine; University of Arkansas for Medical Sciences.