Vitamin B12 shots for weight loss treatment - all you need to know

B12 vitamin is beneficial for many processes in our body. Some researches show that it can even help with weight loss indirectly. If you are thinking taking the shots, here is what you need to know.

Dr.med. Viktor Simunović

28 Dec 2023.

In the health and fitness world, there's always a buzz around new trends and treatments that promise to help us achieve our wellness goals. Vitamin B12 shots have emerged as a popular option for those looking to enhance their weight loss journey. But what exactly are Vitamin B12 injections, and how do they contribute to weight loss?

Does B12 help with weight loss?

The short answer is yes. It can help with weight loss but is not a magical solution. You won't lose fat overnight or without proven methods like healthy food and physical activity.

Vitamin B12 plays a crucial role in the body's metabolism. It helps in the conversion of food into energy, which can have an indirect effect on weight management. Also, studies on animals showed that a deficiency of B12 can lead to a significant increase in body fat percentage.

A study shows that people with a B12 deficiency might experience fatigue and low energy, which can hinder physical activity and increase the chance of gaining weight.

Vitamin B12 injections dosage and frequency for weight loss

The frequency and dosage of Vitamin B12 injections for weight loss are not precisely established, as there is a lack of scientific studies providing definitive guidelines.

Typically, the dosage and frequency of these injections are determined based on individual health needs and under medical supervision, especially since Vitamin B12 is more commonly used to treat deficiencies rather than for weight loss. However, there are some recommendations.

The National Institutes of Health recommends a daily dose of 2.4 mcg for adults. Most people receive this amount of intake if they follow a healthy diet.

Older studies recommend 1000 mcg per injection twice a week for three weeks to fight vitamin deficiency. After that, one injection per month should suffice to maintain normal levels of B12.

As said, there is no complete and thorough research regarding the role of vitamin B12 in weight loss and what dosage and frequency is required to achieve results. Consult EUDoctor first; our experts will assess your condition and provide advice or prescription if needed.

Side effects of taking B12 injections for weight loss

Using vitamin B12 specifically for weight loss is less conventional. It can lead to side effects, especially if administered improperly or excessively. The side effects of B12 injections can include:

Local reactions at the injection site: this can include redness, pain, swelling, or itching of the skin where the injection was given.
Allergic reactions (anaphylaxis): In rare cases, individuals might experience symptoms that may include rashness, itching, swelling, dizziness, fast heartbeat, and difficulty breathing.
Increased risk of acne
Mild diarrhea
Headache and dizziness

B12 oral supplements

B12 vitamins can be taken in the form of pills. However, the dosage in supplements can be much higher, ranging from 500 to 2,000 micrograms. This is because only a small percentage of B12 is absorbed in the digestive tract.

In contrast, B12 injections, usually cyanocobalamin or hydroxocobalamin, are administered in 100 to 1,000 micrograms. Since injections bypass the digestive system, more B12 is directly available to the body.

Should you use vitamin B12 shots if you are overweight?

B12 can help boost your metabolism and increase energy levels if you are overweight. The problem is that metabolism burns calories faster, so you will feel hungry more often. That is the first obstacle you need to cross: control food intake.

Of course, B12 vitamin shots can't replace physical activity and a healthy diet. If you consider B12 shots, book a consultation with our physician and decide the best course of action together.

We love to share our knowledge