Side Effects of Vitamin B12 Supplements and Injections: Everything You Need to Know


Vitamin B12 is a water-soluble vitamin that is required for the proper function and development of several body organs, including the brain, nerves, and blood cells. It can be found in a variety of foods, including meat, fish, eggs, and milk. Supplements, on the other hand, are a convenient and rapid way to obtain Vitamin B12.

Supplements may be a convenient way to receive Vitamin B12, but it’s always a good idea to check a doctor before relying on such unnatural sources. It’s critical to understand the proper supplement dosages to consume based on your body’s needs. Supplements for Vitamin B12 should only be used by patients who do not consume dairy products, shellfish, or fortified cereals.

Overdosing on Vitamin B12, according to experts, is extremely unusual, but it can have serious consequences. Those who receive B12 injections are more likely to experience side effects. These injections are considered to have a faster rate of absorption than oral supplements, which is why they can have negative consequences. As a result, only a doctor’s prescription is required for the shots.


Excessive Vitamin B12 consumption can cause diarrhoea, dizziness, skin rash, lethargy, and swelling, to name a few negative effects. An overdose of Vitamin B12 in the body can also cause anaphylaxis, a rare but life-threatening allergic reaction.

According to studies, B12 deficiency is more common in adults, but if there is a requirement for people under the age of 18, here is the recommended dosage to take.

It is suggested that people over the age of 14 take 2.4 micrograms of B12 every day. Breastfeeding mothers should take only 2.8 micrograms, while pregnant women should take 2.6 micrograms. Finally, specialists say that 25 to 100 micrograms of B12 is sufficient for people aged 50 and up.