5 Side Effects of Vitamin B12 Supplements That You Should Not Ignore

Here are some lesser known side effects of Vitamin B12 supplements which you should not ignore.


Vitamin B12, a crucial nutrient for various bodily functions, is generally considered safe when taken as a supplement. However, like any dietary supplement, it may induce certain side effects in some individuals. Understanding these potential side effects is essential for those considering or currently taking Vitamin B12 supplements. This article covers some of the most common Vitamin B12 supplements that you should not ignore if you are considering to take Vitamin B12 supplements.

5 Side Effects of Vitamin B12 Supplements

1- Diarrhoea

One common side effect is gastrointestinal disturbance, often manifesting as diarrhoea. This is typically a result of the body’s reaction to an excess of Vitamin B12. While it may not affect everyone, those experiencing persistent digestive issues after supplementing should consult a healthcare professional.

2- Skin Reactions

Skin-related side effects are another consideration. Some individuals may develop itching or a rash as a response to Vitamin B12 supplementation. These dermatological reactions, although not widespread, can be bothersome for those affected. Monitoring any changes in the skin and seeking advice from a healthcare provider is recommended if such symptoms arise.

3- Dizziness

Dizziness is a less common side effect associated with high doses of Vitamin B12. This typically occurs when individuals exceed the recommended dosage, and the body reacts adversely. While not a prevalent issue, anyone experiencing persistent dizziness after taking Vitamin B12 supplements should seek medical guidance.

Also read: 7 Side Effects of Vitamin D Tablets That You Did Not Know About 

4- Allergic Response

In rare cases, an allergic reaction to Vitamin B12 supplements may occur. Symptoms of an allergic response can range from mild to severe and may include itching, swelling, or difficulty breathing. Immediate medical attention is crucial if an allergic reaction is suspected.

5- Overdose Risk

While not a direct side effect, it’s important to note the potential for interactions with medications or other supplements. Additionally, excessive intake of Vitamin B12 beyond recommended levels can lead to adverse effects. To avoid these risks, consulting with a healthcare professional before starting a supplement regimen is essential.

5 Side Effects of Vitamin B12 Supplements That You Should Not Ignore

What to do Before Incorporating Vitamin B12 Supplements in Your Diet?

Before embarking on a Vitamin B12 supplement regimen, it is essential to consult with a healthcare professional. This is particularly important for individuals with pre-existing health conditions or those taking other medications, as interactions can occur. A healthcare provider can assess individual health needs and determine an appropriate dosage to avoid potential side effects.

In summary, while Vitamin B12 supplements offer numerous health benefits, users should be aware of potential side effects. Monitoring one’s body for any adverse reactions, consulting with a healthcare professional, and sticking to recommended dosages are key practices to ensure the safe and effective use of Vitamin B12 supplements.


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