How many B12 injections do I need?

Before considering B12 injections, it is important to consult with a healthcare provider. The information provided here is for general knowledge and should not be taken as medical advice.

Is it safe to get a B12 shot every week?

Yes, getting a B12 shot weekly is often considered safe and common, especially for correcting a deficiency or for initial treatment, with providers often starting with weekly shots for several weeks before moving to less frequent maintenance doses (monthly/bi-weekly) for general wellness or weight loss, though it's crucial to consult a doctor to determine the right schedule for your specific needs, as vitamin B12 is water-soluble, so excess is usually flushed out. 

Is B12 safe during pregnancy?

Yes, Vitamin B12 is safe and crucial during pregnancy for the baby's brain and spinal cord development, helping prevent birth defects, and supporting maternal health, with supplements recommended if diet isn't enough, but always check with a doctor before starting any new supplement. Deficiency poses risks, while adequate intake, alongside folate, is vital for preventing neural tube defects, so get it from animal products, fortified foods, or prenatal vitamins, and consult your provider for personalized advice. 

How much B12 injection do I need?

Injectable hydroxocobalamin comes in a 30 mL vial that contains 1,000 mcg of vitamin B12 per mL. It must be injected into a muscle. The recommended hydroxocobalamin dosage for adults starts at 30 mcg (0.03 mL) injected daily for 5 to 10 days. You'll then inject 100 mcg to 200 mcg (0.1 mL to 0.2 mL) once a month.

Can B12 injections cause headaches?

Overview: Cyanocobalamin is a form of vitamin B12 that is used to increase vitamin B12 levels. It is available in a variety of forms over the counter as a supplement and by prescription as an injection or nasal spray. Some common side effects may include headache, feeling weak or tired, and nausea.

Vitamin B12 Injections - Everything you need to know with Dr Mandy

How do you feel when your B12 is low?

When your B12 is low, you might feel extremely tired, weak, or have a lack of energy, along with neurological issues like tingling/numbness (pins and needles) in your hands and feet, balance problems, and "brain fog" (memory/confusion). Other common signs include a sore, red tongue, pale skin, mood changes (depression/irritability), shortness of breath, and digestive issues. These symptoms can develop slowly and worsen over time, impacting both your body and mind. 

How soon do you feel less tired after a B12 injection?

You can often feel less tired within 24 to 72 hours after a B12 injection, with significant improvements in energy, mood, and focus usually felt in the first few days to a week, especially if you have a severe deficiency. However, full energy restoration and optimal benefits can take 1 to 3 weeks, as your body builds up its B12 reserves. 

Are B12 shots better than pills?

B12 shots are generally better for people with absorption issues (like digestive diseases, older adults, or certain meds) because they go straight to the bloodstream, offering faster, guaranteed delivery, while for most others without issues, high-dose oral pills (especially sublingual/under-the-tongue) can be just as effective and cheaper/more convenient, but shots are superior for rapid correction or severe deficiency. The best choice depends on your specific health needs, so consult a doctor.
 

How many B12 injections do you need to feel better?

Treating vitamin B12 deficiency anaemia

At first, you'll have these injections every other day for 2 weeks or until your symptoms have started improving. Your GP or nurse will give the injections.

What are the main causes of B12 deficiency?

B12 deficiency often stems from not getting enough in your diet (especially vegans/vegetarians), but the most common cause is poor absorption due to autoimmune conditions like pernicious anemia, digestive diseases (Crohn's, Celiac), stomach/intestinal surgery (gastric bypass), chronic use of antacids/metformin, and aging, which reduces stomach acid needed for B12 uptake.
 

Which trimester is B12 most important?

Two other studies found that low maternal vitamin B12 levels during the third trimester were associated with lower cognition [28,29] and social development [29] in offspring at two years of age.

What is cyanocobalamin?

Cyanocobalamin is a synthetic form of vitamin B12, a crucial water-soluble nutrient essential for making red blood cells, DNA, and maintaining healthy nerve function. Used to treat and prevent B12 deficiencies, it's available as tablets, injections, or nasal sprays, especially for those on vegan diets or with absorption issues like pernicious anemia. This cobalt-containing compound helps your body metabolize proteins, fats, and carbs, and ensures proper cell energy production.
 

Does vitamin B12 affect fertility?

Yes, Vitamin B12 significantly affects fertility in both women and men, as deficiencies can impair ovulation, egg/sperm quality, hormonal balance, and implantation, while adequate levels support reproductive health, DNA synthesis (for eggs and sperm), and reduce risks of complications like fetal loss, with studies showing higher B12 linked to better outcomes in fertility treatments. 

How long do B12 shots last?

B12 shots can last from a few days to several weeks, typically providing benefits for 1 to 2 weeks, but this varies greatly by individual, with some feeling effects for up to a month or more, depending on the severity of deficiency, metabolism, underlying health, and lifestyle. Initially, people with significant deficiencies might need weekly shots to build stores, eventually moving to monthly or less frequent maintenance as levels stabilize, with different B12 forms (like hydroxocobalamin vs. cyanocobalamin) also affecting duration. 

Why are doctors stopping B12 injections?

Coronavirus has made it necessary to move patients on B12 injections to oral treatment. Reason: RISK REDUCTION in terms of limiting your movement outside your home and contact with our staff and nurses. Nationally all NHS organisations will be stopping injections during this difficult time.

What foods are high in B12?

Foods high in vitamin B12 are primarily animal products like clams, liver, fish (salmon, tuna, sardines), meat, poultry, eggs, and dairy, while vegans and vegetarians can get it from fortified sources like breakfast cereals, nutritional yeast, and fortified plant milks. Clams and liver are exceptionally rich, but dairy and fortified cereals are also excellent, easily accessible options.
 

What are the mental symptoms of B12 deficiency?

Vitamin B12 deficiency can cause significant mental and psychiatric issues, including depression, anxiety, irritability, confusion, memory loss, and difficulty concentrating, ranging from mild to severe. More serious symptoms can involve psychosis, hallucinations, delusions, delirium, apathy, and even dementia-like states, affecting mood, cognition, and perception. These neuropsychiatric symptoms can sometimes appear before or without typical physical signs like anemia. 

How much do B12 injections typically cost?

Vitamin B12 injections typically cost $20 to $80 per shot at clinics, but prices vary based on location, provider (doctor vs. spa), dosage, and if you buy packages. While professional injections are pricier, you can save significantly by getting a prescription and using coupons for the medication itself, sometimes for just a few dollars, with pharmacies like GoodRx offering discounts on generic vials. 

How do I know if B12 injections are working?

To see how well it's working, your doctor will ask you about your symptoms such as tiredness and lack of energy. They will also give you regular blood tests to monitor the vitamin B12 levels in your blood.

Is there a downside to B12 shots?

While B12 shots are generally safe, cons include minor injection site pain/swelling, headaches, dizziness, nausea, diarrhea, and rare but serious allergic reactions (hives, swelling, breathing issues) or electrolyte imbalances (low potassium). They offer little benefit if you're not deficient and might not work for weight loss, requiring a doctor's oversight for proper diagnosis and to check for drug interactions. 

Where is the best place to inject B12 shots?

The best places for B12 shots are areas with muscle or fatty tissue, such as the thigh (mid-outer quadrant), upper arm (deltoid), buttocks (upper outer area), or lower abdomen, with rotation between sites to prevent irritation, but always follow your doctor's advice, as the abdomen (for subcutaneous) or thigh/arm (for intramuscular) are common choices for self-injection due to accessibility. 

What happens to your weight when you take vitamin B12?

Taking B12 doesn't directly cause weight loss or gain in healthy people; instead, it supports metabolism and energy, so if you're deficient, correcting it can boost energy, potentially helping you be more active and lose weight, but it's not a fat-burning supplement on its own. Deficiency might be linked to weight issues, but supplementation only helps if you're lacking B12, with benefits coming from better energy for exercise rather than direct fat loss. 

What should you not do after a B12 shot?

After a B12 injection, you should avoid rubbing the site, taking hot baths/saunas, and heavy exercise for 24-48 hours to prevent irritation and infection; also, limit alcohol as it hinders absorption, and drink plenty of water to help your body use the vitamin. For best results, stay hydrated, rest, and contact your provider if you have severe reactions like rash or difficulty breathing, which could signal an allergic reaction.
 

What does B12 fatigue feel like?

B12 fatigue feels like extreme, persistent tiredness and weakness, a lack of energy even after rest, and "brain fog," often accompanied by shortness of breath, pale skin, pins and needles, and a sore tongue, because your body can't produce enough healthy red blood cells to carry oxygen. It's a drained feeling where simple tasks are hard, and it can also impact mood and memory.
 

What is the best shot for fatigue?

If you deal with fatigue all the time and you're experiencing many of the other symptoms listed, a B12 shot may be what you need. To find out if you have a vitamin B12 deficiency or some other condition that's causing your fatigue, make an appointment with Dr.