Vitamin B12 Shots for Weight Loss

Vitamin B12 shortage is common and the reasons for this vary. But it usually has to do with our lifestyle and diet.

We’re constantly exposed to pollutants, pesticides, and genetically modified foods in the animal products we eat.

Obtaining an adequate supply of vitamin B12 can be challenging, especially for vegans and vegetarians, since the nutrient is only found in animal-based foods.

B12 Shots for Weight Loss Near Me - for Signs of a Deficiency

Again, vitamin B12 is an essential vitamin that our body needs for many key functions. As a water-soluble vitamin, it helps with DNA synthesis, which is the production of new cells, and helps to produce red blood cells, which carry oxygen throughout the body.

It also plays a critical role in producing energy and maintaining proper neurological function, including the functioning of the central nervous system.

When there is a lack of vitamin B12 in the body, it can result in symptoms of deficiency:

Fatigue is a common symptom, and many people experience feelings of tiredness and low energy levels.

Brain fog and memory loss are also common, as well as neurological problems such as numbness and tingling in the limbs.

Heart palpitations and rapid heartbeat can also occur, as well as pale skin and complexion.

Muscle weakness is another symptom of vitamin B12 deficiency, and people may feel weaker than usual, especially during physical activity.

Mood changes and irritability can also occur, as well as loss of appetite and weight.

Digestive problems such as constipation can also be a symptom, and in severe cases, infertility and reproductive problems may occur.

It is important to note that these symptoms can also be caused by other health issues, and it is essential to speak with a doctor for an accurate diagnosis.

If you are experiencing any of these symptoms, your doctor may recommend a blood test to check your vitamin B12 levels.

Early detection and treatment can help prevent more significant health problems in the future.

How Long Does a B12 Shot Last?

The length of time that vitamin B12 stays in your body after an injection can vary greatly, and there are several factors that can influence this.

While it is not possible to determine an exact time frame, research suggests that if the body properly utilizes vitamin B12, it can remain in the system for up to five years. However, the actual injection will not stay in the body for that long, as the vitamin is rapidly absorbed into the bloodstream.

Depending on various individual factors such as dietary habits, medication use, age, medical disorders, and lifestyle choices, the length of time that vitamin B12 stays in the body can vary.

For those without a vitamin B12 deficiency, the majority of the vitamin B12 from an injection will be absorbed and quickly eliminated through urine. This accounts for the high percentage of vitamin B12 that was found in the urine 48 hours after administration in some research studies.

In contrast, those with a deficiency may store up to 50% of the vitamin in the liver, allowing them to feel the effects of the shot for up to a month.

Lifestyle choices such as alcohol consumption and medication use can also affect the longevity of vitamin B12 in the body. People with liver disorders or gastrointestinal problems may have difficulty storing the vitamin, leading to the need for more frequent injections. Additionally, as we age, our bodies may struggle to store vitamin B12, and additional injections may be necessary to maintain healthy levels in the body.

In conclusion, while the length of time that vitamin B12 stays in the body after an injection can vary, it is important to consider the individual factors that may influence this, including dietary habits, lifestyle choices, medical disorders, and age.

Regular injections of vitamin B12 can help maintain healthy levels of the nutrient in the body, leading to improved overall health and wellbeing.

How Often Can You Get a B12 Shot?

The frequency of B12 injections varies based on several individual factors, such as age, activity level, body-fat ratio, weight loss goals, metabolic rate, energy levels, and the ability to absorb B12.

These factors can influence how much and how often you need B12 treatment to boost your metabolism and increase fat burning.

It is common for patients to receive regular injections to maintain the desired results. If a patient is naturally deficient in B12, monthly injections may be the most effective.

On the other hand, some patients may only need injections every three to four months. The ideal frequency will be determined on a case-by-case basis to meet the specific goals of each patient.

B12 Shot Benefits

When people struggle to maintain sufficient Vitamin B12 levels due to an absorption problem or a vegan or vegetarian diet, B12 supplements often come to their rescue.

Unlike Vitamin B12 tablets that must go through our stomach before reaching the bloodstream, reducing our body’s absorption rate, a Vitamin B12 injection directly delivers the much-needed nutrient into our blood. With this direct delivery, the following benefits can be seen:

  • Balanced Metabolism
  • Increased Energy Levels
  • Improved Cognitive Function
  • Better Sleep
  • Improved Bone Density
  • Better Mood
  • Weight Loss

In addition, regular Vitamin B12 injections may also lower the risk of several medical conditions such as:

  • Stroke
  • Heart Disease
  • Dementia
  • Osteoporosis
  • Age-related Macular Degeneration
  • Anemia
  • Vision Loss
  • Neural Tube Defects

Vitamin B12 injections are considered safe and come with no major side effects. The effects of a Vitamin B12 shot usually last between 48 and 72 hours after the injection, but since every body is unique, the duration may vary.

Depending on the patient’s Vitamin B12 deficiency, the doctor may prescribe between five to seven injections in the first week of treatment.

Side Effects of B12 Shot

B12 shots can cause some side effects, which can include:

  1. Injection Site Reactions: Pain, redness, swelling, and irritation at the injection site may occur shortly after the shot. There is also a risk of infection, so be sure to follow the doctor’s orders for wound care.
  2. Gastrointestinal Effects: B12 shots can cause negative side effects in the gastrointestinal tract such as nausea, upset stomach, vomiting, mild diarrhea, and indigestion. These effects typically last for a week after the shot, but it’s important to contact your doctor if you experience them in an extreme manner.
  3. Skin Reactions: The B12 shot can cause negative side effects on or around the skin. A rash may develop around the injection site that could spread. In the case of difficulty breathing, contact your local emergency room physician immediately, as this could be a sign of a dangerous allergic reaction. Itching of the skin in the area of the injection is another possible side effect.
  4. Internal Effects: The injection of additional B12 can cause some internal side effects, such as headaches, dizziness, weakness, numbness and tingling, joint pain, and a low-grade fever. If the fever persists, contact your doctor.
  5. More Serious Effects: B12 shots may contribute to low potassium levels in the body, which is a rare but potentially dangerous side effect. This can cause muscle cramping, extreme fatigue, and an irregular heartbeat. If you experience any of these symptoms, it’s important to contact your doctor immediately.

How Quickly Does B12 Shot Work?

The onset of action and the effectiveness of B12 shots can vary from person to person. In general, B12 shots start to work within a few hours of being administered.

However, the time it takes for the body to absorb the vitamin B12 and for its effects to become noticeable can range from a few days to several weeks, depending on several factors, such as the individual’s nutritional status, the dose of B12 received, and the underlying cause of the B12 deficiency.

It’s also important to note that the full effects of a B12 shot may not be seen for several weeks or months, as the body slowly builds up its stores of this important nutrient.

Additionally, the frequency and number of B12 shots needed to maintain optimal levels of B12 can vary, and the treatment plan will be determined by the individual’s physician based on their specific needs and health status.

B12 Energy Shot: Where Can I Get a B12 Shot?

B12 shots can be obtained from various sources, including at a weight loss clinic! THE GLENMORE CLINIC offers B12 injections as part of their weight loss programs.

Be sure to discuss your medical history and any current medications you are taking with the clinic before getting a B12 shot, as some health conditions may contraindicate its use.


In conclusion, vitamin B12 is an essential nutrient for the proper functioning of our body.

A deficiency in vitamin B12 can result in a wide range of symptoms, including fatigue, brain fog, memory loss, heart palpitations, pale skin, muscle weakness, mood changes, appetite loss, constipation, and infertility.

If you are experiencing any of these symptoms, it is important to talk to a doctor for an accurate diagnosis and treatment plan.