Wellness4 min readUpdated
B12 Shots: Benefits, Side Effects and How Often to Get Them
What B12 shots do, the real benefits, who is most likely to be low in B12, side effects, how often people get them and what they cost in Carlsbad.
How we write and check our articles
If you only read one thing
B12 shots inject vitamin B12 into a muscle so it bypasses the gut. They are FDA-approved for B12 deficiency and, in people who are low, relieve tiredness, weakness, brain fog, tingling and low mood. People over 50, vegans, those taking metformin or acid reducers, and people after weight-loss surgery are most likely to be low. Research shows little energy benefit in people with normal levels. Side effects are usually just a sore spot at the injection site.
- B12 keeps blood and nerve cells healthy.
- B12 shots are FDA-approved for deficiency.
- They relieve fatigue, brain fog and tingling caused by low B12.
- Older adults, vegans and people on metformin or acid reducers are at higher risk.
- The NIH says B12 does not boost energy if your levels are already normal.
- Side effects are usually mild soreness at the injection site.
- A blood test can confirm a deficiency.
On this page 8 sections
A vitamin B12 shot is an injection of vitamin B12 into a muscle, so it is absorbed directly instead of through the gut. B12 keeps your blood and nerve cells healthy and helps your body make energy from food. B12 injections are FDA-approved for treating B12 deficiency, and for people who are low, they can relieve tiredness, weakness, brain fog, tingling and low mood. Many people also have them as a wellness boost and report feeling more energetic, though research shows the clearest benefits in people who are low or at risk. Side effects are usually limited to a sore spot or small bruise at the injection site.
This guide explains what B12 does, the benefits of B12 shots, who is most likely to benefit, side effects, how often people get them and what they cost in Carlsbad.
What does vitamin B12 do?
Vitamin B12 helps your body make healthy red blood cells, keeps nerves working and helps make DNA. Without enough, red blood cells become large and do not carry oxygen well (megaloblastic anemia), which makes you tired and weak, and nerves can be damaged. Your body stores a lot of B12, so a deficiency can take years to show. B12 is found naturally only in animal foods such as meat, fish, eggs and dairy, plus fortified foods.
Benefits of B12 shots
- Correcting a deficiencyInjections raise B12 levels quickly and reliably, including in people who cannot absorb it from food.
- More energyIf tiredness comes from low B12, restoring it improves fatigue and weakness.
- Clearer thinking and moodLow B12 can cause brain fog, poor memory and low mood, which improve as levels recover.
- Healthy nervesTreating low B12 early helps prevent or improve numbness and tingling in the hands and feet.
- Skipping the gutAn injection bypasses absorption problems caused by age, low stomach acid, some medicines or gut surgery.
An honest note: the National Institutes of Health says B12 does not boost energy or endurance in people who already get enough from their diet. Many people still enjoy B12 shots as part of a wellness routine, but if you feel tired all the time, it is worth finding out why. See do B12 shots help with weight loss?
Who is most likely to benefit?
| Group | Why B12 can run low |
|---|---|
| Adults over 50 | Less stomach acid means less B12 is absorbed from food |
| Vegans and vegetarians | B12 is found naturally only in animal foods |
| People taking metformin | It can lower B12 absorption and levels |
| People taking acid reducers | Medicines such as omeprazole reduce B12 absorption from food |
| After weight-loss or stomach surgery | The parts of the gut that absorb B12 may be bypassed |
| Pernicious anemia, celiac or Crohn’s disease | The body cannot absorb B12 properly |
Signs of low B12 include tiredness, weakness, pale skin, a sore tongue, numbness or tingling, balance problems, poor memory and low mood. A blood test from your doctor can confirm a deficiency, and some conditions, such as pernicious anemia, need ongoing medical care.
Side effects of B12 shots
B12 shots are very well tolerated. B12 is water soluble, so your body passes out what it does not need, and the NIH notes it has not been shown to cause harm even at high doses. Possible side effects include:
- Soreness, redness or a small bruise where the needle went in
- Mild diarrhea or itching, uncommon
- Rarely, an allergic reaction; seek help straight away for hives, swelling or trouble breathing
Tell us about your medical conditions and medicines before your first injection, especially if you have kidney disease, a cobalt allergy or Leber’s disease, an inherited eye condition.
How often should you get a B12 shot?
It depends on why you are having them. For a diagnosed deficiency, your doctor sets the schedule, which often starts with frequent injections and moves to regular maintenance. For wellness, many people have a short series and then top up every few weeks. Our packages of four and six injections make a regular routine simpler.
B12 shot cost in Carlsbad
Single
1 injection$35
4 shots
Package$100
6 shots
Package$160
Each injection takes a few minutes and is given by our medical team, with no downtime. Some people have a B12 shot as a quick boost between IV drips; see IV therapy benefits.
B12 injections in Carlsbad
Learn more about vitamin B12 injections, read what a medical spa is, or book at our studio on El Camino Real in South Carlsbad.
Frequently asked questions
What are the benefits of B12 shots?
For people low in B12, more energy, clearer thinking, better mood and healthy nerves.
Do B12 shots give you energy?
Yes if you are low in B12; the NIH says they do not boost energy if your levels are normal.
Who should get B12 shots?
People with a B12 deficiency or at risk, such as adults over 50, vegans, and people on metformin or acid reducers.
What are the side effects of B12 shots?
Usually soreness or a small bruise at the injection site; allergic reactions are rare.
How often should you get a B12 shot?
For deficiency, as your doctor advises; for wellness, many people have a series and then top up every few weeks.
How much is a B12 shot?
$35 at Glow Theory, or $100 for four.
Sources
Insiyah Darugar
Insiyah Darugar, MSN, FNP is the founder and CEO of Glow Theory Aesthetic & Dermatology Studio in Carlsbad. She brings more than 15 years of hands-on experience in dermatology and aesthetics and completed the Dermatology Nurse Practitioner Fellowship at Lahey Hospital & Medical Center, a…
