B12 Weight Loss Shots: Boost Your Metabolism

B12 Weight Loss Shots

Losing weight can be a challenging task, with healthy food options often overshadowed by tempting high-fat, high-calorie foods. Increasing physical activity can also be a struggle due to a lack of time or energy. However, some individuals believe that vitamin B12 shots may provide a solution for weight loss.

In this article, we will explore the impact of vitamin B12 on weight loss and examine the effectiveness of B12 shots based on scientific research. Additionally, we will compare B12 injections with lipotropic injections to understand the differences between the two.

We will also discuss who should consider getting a B12 shot and who should avoid it. Furthermore, we will delve into the benefits of increasing B12 levels through diet and compare it to injection. For fitness trainers, we will provide insight on how to give clients the best nutritional advice related to vitamin B12 and weight loss.

What are B12 weight loss shots?

B12 weight loss shots are injections of high doses of vitamin B12. Vitamin B12 is an essential nutrient that plays a crucial role in many body functions, including the production of red blood cells, DNA synthesis, and nerve function. B12 shots are commonly used to treat vitamin B12 deficiency, anemia, and other conditions that affect the body’s ability to absorb vitamin B12.

In recent years, B12 shots have gained popularity as an alternative weight loss method. Some weight loss clinics and medical professionals claim that B12 shots can boost metabolism, increase energy levels, and promote weight loss.

How do B12 shots help with weight loss?

The B vitamins, particularly vitamins B6 and B12, are known to boost energy levels. Vitamin B6 also called pyridoxine, regulates glycogen, which directly affects energy levels, as well as appetite. On the other hand, vitamin B12, also known as cobalamin, plays a crucial role in cell metabolism, which ultimately impacts how energized or fatigued one feels.

Increased energy is often touted as one of the primary benefits of B12. This heightened energy can make it easier to exercise, enabling individuals to work out harder without feeling fatigued. However, the question remains whether B12 injections can truly promote weight loss.

Effectiveness of Vitamin B12 for Losing Weight

Most of the research on the relationship between vitamin B12 and weight loss involves individuals who have undergone weight loss surgery. B12 shots are often used in these cases to correct or prevent B12 deficiency. Studies have also evaluated the use of B12 shots to combat deficiency due to other causes.

However, there is a lack of research assessing the impact of B12 injections on weight loss efforts in humans. While some studies involving animals have been conducted, no human trials have been carried out in this regard. Nonetheless, research suggests that individuals who are overweight are typically deficient in vitamin B12.

For instance, a 2020 review published in the journal Nutrients linked vitamin B12 deficiency to increased body weight in both children and adults (1). The review also found that as B12 deficiency increased, so did insulin resistance, indicating that low vitamin B12 levels may contribute to obesity.

Similarly, a 2014 study involving 976 participants reported that individuals with low vitamin D levels were more likely to be overweight, with higher body mass indexes (2). Those with metabolic syndrome, which involves having multiple health conditions such as high blood pressure, high cholesterol, and high blood sugar, also tended to have lower vitamin D levels. Metabolic syndrome increases the risk of developing major medical conditions such as heart disease and type 2 diabetes.

Overall, while research suggests a link between low vitamin B12 and increased weight, it remains unclear whether B12 injections can actually promote weight loss in humans.

Benefits of B12 shots for weight loss

B12 shots have been associated with a number of potential benefits for weight loss. These include:

  • Increase in energy levels, which helps to fight off fatigue and lethargy
  • B12 shots can help to improve your metabolism, which can in turn assist with weight loss efforts.
  • B12 shots are that they can help to balance sleeping patterns, which can be important for maintaining overall health and well-being.
  • B12 shots have also been linked to an increase in concentration and mood, which can be particularly helpful for those who are trying to lose weight.
  • Furthermore, B12 shots have been shown to boost hair growth, which can be an added bonus for those who are struggling with hair loss or thinning.

Overall, there are a number of potential benefits associated with B12 shots for weight loss, and these should be considered by anyone who is looking to improve their health and well-being.

Risks and side effects of B12 shots

Like any medical treatment, B12 shots come with risks and side effects. Some of the potential risks and side effects of B12 shots include:

  • abdominal pain
  • chest pain
  • cough
  • dizziness
  • eye pain
  • irregular heartbeat
  • ringing in the ears
  • weight gain 

While some side effects of B12 injections may be uncomfortable, others may require medical attention. Clients who experience any adverse effects after receiving a B12 injection should consult their doctor to determine if this treatment option is suitable for them.

Who should consider B12 shots for weight loss?

Your doctor may recommend B12 shots if you have a vitamin B12 deficiency, anemia, or other conditions that affect your body’s ability to absorb vitamin B12. However, you should not use B12 shots as a substitute for a healthy diet and exercise, as they are not a magic weight loss solution.

B12 shots may also be beneficial for people who have trouble sticking to a healthy diet and exercise routine due to low energy levels or sluggish metabolism.

How often should you get B12 shots for weight loss?

The frequency of B12 shots for weight loss varies depending on the individual’s needs and goals. Some weight loss clinics may recommend weekly injections, while others may recommend monthly injections.

It’s essential to work with your doctor or weight loss professional to determine the frequency and dosage that is appropriate for you.

How to Increase Vitamin B12 Without an Injection

Clients can obtain enough vitamin B12 through their diet without the need for injections. There are various foods that are rich in vitamin B12, including:

  • fish (such as salmon, trout, tuna, and sardines),
  • Shellfish (clams)
  • organ meat (like liver and kidneys)
  • beef
  • Milk
  • Yogurt
  • Cheese
  • eggs
  • and fortified cereal.

By consuming a balanced diet that incorporates these foods, clients can ensure they receive the nutrients necessary to support their weight loss journey while avoiding unhealthy food choices that can lead to weight gain.


B12 weight loss shots can be an effective tool for individuals looking to lose weight. They work by boosting metabolism and energy levels, which can help with weight loss. It’s important to remember that you should use B12 shots in conjunction with a healthy diet and exercise plan. Furthermore, a licensed healthcare professional should only administer B12 shots, and if you have certain medical conditions, you should consult with a healthcare professional before getting the shots.

While B12 weight loss shots are generally safe, it’s important to note that they are not a standalone weight loss method. To achieve long-term weight loss goals, it’s important to adopt a healthy lifestyle that includes a nutritious diet and regular exercise.

Before trying B12 weight loss shots, it is crucial to seek advice from a healthcare professional to determine if they are a suitable choice for you. With the right diet and exercise plan, B12 shots can help you shed those extra pounds and achieve your weight loss goals.


How often should you get a B12 shot for weight loss?

If your weight loss plan involves these injections, your healthcare provider will give them to you on a weekly basis. Certain healthcare professionals may suggest B-12 shots up to twice a week to boost energy and aid in fat metabolism. In case of a general deficiency in this micronutrient, some doctors may advise B-12 injections.

How quickly does the B12 shot work?

Because B12 shots are administered directly into the muscle, bypassing the digestive system, they begin to take effect immediately. Typically, patients will experience beneficial effects within 24-72 hours after receiving the treatment.

Are B12 shots safe?

Vitamin B12 injections are generally deemed highly safe, with no significant side effects. Nonetheless, in extremely rare instances, certain individuals may encounter adverse effects arising from allergic reactions or sensitivity (29, 30). Should any side effects arise, it is recommended to consult with your physician.

How much does a B12 shot cost?

The cost of a vitamin B12 injection can vary depending on the clinic you go to and the dosage your body requires. It could range anywhere from $50 for a 10mg vial to $250 for a 50mg vial.

Is a B12 shot better than a pill?

In 2008, research showed that the body absorbs only around 1.3% of a 1,000 mcg B12 dose taken orally. However, when the same amount of B12 is administered through injections, absorption rates were found to be between 55% and 97%.

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