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Vitamin B12 Deficiency Side Effects: How Low B12 Levels Can Damage Your Heart, And Increase Stroke Risk

Low on Vitamin B12? Then this might be the cause behind your low energy levels and you need to watch out for it .These are some signs your body might give you. Scroll down to know in detail.

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Written By: Bhavya Gulati | Published : September 7, 2025 7:00 PM IST

Vitamin B12 plays several vital roles that many people are unaware of like it helps producing red blood cells, supports nerve function and helps your body build DNA, Deoxyryibonucleic Acid . It also keeps a naturally occurring amino acid in check and when vitamin B12 is low, it sometimes can increase your chance of high blood pressure, stroke and even a heart attack and if you are low on B12, you need to take care of it.

Vitamin B12 Deficiency: How It Damages Your Heart

When your body does not get enough 12, it struggles to break down amino acids that occur naturally and increase in these assets become really damaging stiffening. Blood vessels, triggering inflammation, and harming the inner lining of arteries. Over the time, you might also notice plaque built-up and the increase in the risk of clot, which can block arteries and lead to heart attacks, and strokes. If you have a deficiency in B12, there is a high risk of pressing your blood vessels and raising blood pressure.

Health impacts of vitamin B12 deficiency

  • Nervous system and blood pressure: a lack of B12 can damage your nerves that regulate your heartbeat, potentially causing fluctuations in blood pressure, even constant high blood pressure.
  • Anaemia and increased heart workload: severe B12 deficiency can cause which means red blood cells become abnormally large, and ineffective at carrying oxygen. You will see increased levels of high blood pressure over time.

What's normal and what to do?

  • Blood levels: if you have blood levels between 200 to 900, then it can be considered normal, and if you have below it, that means you have a deficiency.
  • Sources of vitamin B12: B12 is found in animal-based foods like eggs, dairy, poultry, fish, and meat. If you are a vegetarian, then you should rely on supplements of vitamin B12.

Vitamin B12 Deficiency-Induced Heart Problems: Who Is At Risk?

If you have Gastrointestinal issues and are uncertain about medications like for me, you may struggle to absorb B12. For such people, they might need to consume oral supplements or an occasional vitamin B12 dose under the supervision of a Doctor.

You should monitor your levels regularly. Blood testing can help with it, and if you are deficient, then making early detection is essential for prevention.

You might be surprised to know that vitamin B12 deficiency can increase the risk of cardiovascular disease, and if you are low on Vitamin B12, it can damage your arteries, raise a lot of risk and contribute to hypertension. If you can control this, then the risks can be managed through proper diet, food supplements, and even targeted medical testing when necessary. If you want to take care of your cardiovascular health, you should start prioritising vitamin B12.

It does not matter if you are young age, vegetarian or not, but you should take a little time to check your levels. It's one of the simplest things you can do for your heart, and without it, the system runs silently until something breaks. If in case you are not sure about it, then you must always consult a doctor.

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