MIC B12 is the shot sold next to Ozempic. You'll find it on medspa menus, weight-loss clinic price lists and telehealth sites, usually promising more energy and faster fat loss. MIC B12 combines three "lipotropic" nutrients (methionine, inositol and choline) with a large dose of vitamin B12, injected once a week.
🔑 Key Takeaways
- Only one of the four ingredients is dosed high enough to do anything on its own
- There's a group of people who really do feel better on these shots, and it isn't defined by weight
- No trial has tested the shot for weight loss, so the before-and-after photos come from something else
- Two common warnings on clinic pages are wrong, and one real one is missing
- The price gap between routes is 30-fold, and the cheapest route has a catch
If you're trying to lose weight, you've probably already been offered one. The pitch is easy to like: a quick weekly shot that helps your liver burn fat and gives you more energy. Most people who get them say they feel something. This guide walks through what's actually in the vial, how much of each ingredient you get, what the evidence supports and what a fair price looks like.
What Is MIC B12?
It's a vitamin shot with three passengers. "MIC" stands for methionine, inositol and choline. Together they're called lipotropics, an old term for nutrients the liver needs to process and move fat. Vitamin B12 is added to almost every version, which is why you'll see it sold as MIC B12, MIC+B12, B12/MIC, Lipo-B or "skinny shots".
Three facts frame everything else:
- It isn't a peptide. It's one amino acid plus a vitamin and two small molecules, none of them bonded together.
- It has no FDA approval. Compounding pharmacies mix it to a prescriber's order. The only FDA-approved part is B12 injection, and only for B12 deficiency.
- There's no standard formula. Each pharmacy sets its own amounts, and some versions drop inositol entirely.
What's in a MIC B12 Injection
Each letter does a real job in your body. Empower Pharmacy's Lipo-B, a common compounded version, contains about 25 mg methionine, 50 mg choline chloride and 1 mg cyanocobalamin per mL. Eden lists 15 mg methionine, 50 mg inositol, 100 mg choline and 1,000 mcg B12 per dose.
Every one of these is a real nutrient your liver uses. The question is whether a weekly shot gives you enough of each to matter.
The Dose Problem Nobody Mentions
The amounts are tiny. We added up what a week of each nutrient looks like, using official intake figures and the doses used in trials, and compared it with one shot.
Three of the four ingredients come in at under 4% of what your body handles in a week. A single egg has about 147 mg of choline, more than a typical MIC shot. Inositol trials gave people 2 to 4 grams a day by mouth, so one shot holds roughly what you'd get from those trials in about half an hour.
B12 is the opposite. A 1,000 mcg shot is about 60 times the weekly recommended intake. Much of it leaves in your urine within a day or two, but enough stays to refill your stores if they're low. That's why the B12 is the part of the shot that can make you feel different.
MIC B12 Benefits: What's Proven and What Isn't
Every claimed benefit traces back to one ingredient. Here's the strongest human evidence behind each.
The pattern is clear. Each ingredient matters when you don't have enough of it. Topping up someone who already does hasn't been shown to burn fat, speed metabolism or add energy.
Do MIC B12 Injections Work for Weight Loss?
Not on their own, as far as anyone has measured. We found no randomized trial of MIC or lipotropic injections for weight loss on PubMed. Healthline's review reaches the same conclusion: whatever weight comes off is most likely from the diet and exercise that come with the shots.
That doesn't mean people on MIC programs don't lose weight. Many do. Clinics usually pair weekly shots with a calorie target, weekly weigh-ins and sometimes a prescription appetite drug like phentermine or a GLP-1. The shot is the visible, weekly part of a program that works for other reasons.
If you're on a GLP-1 such as semaglutide or tirzepatide, MIC B12 won't add meaningful fat loss. The B12 can help if you're eating much less than before, a topic our guide to tirzepatide with B12 covers in detail.
MIC B12 Injections Before and After: What to Expect
Your starting B12 level decides the story. The same shot can feel life-changing to one person and do nothing for the next.
The fastest way to know which column you're in is a blood test for B12 before you start. It's cheap, and it tells you whether the shot can do much for you.
Who Actually Benefits From MIC B12
You might, if your B12 is low and you don't know it. Low B12 is more common than most people think, and it causes exactly the tiredness and brain fog people hope the shot will fix. You're more likely to be low if you:
- Take metformin. In the Diabetes Prevention Program, 19.1% of people on metformin had low or borderline-low B12 after 5 years, versus 9.5% on placebo (Aroda 2016).
- Eat a vegan diet. B12 comes almost only from animal foods.
- Are over 50. Stomach acid falls with age, and you absorb less B12 from food.
- Take acid reducers for a long time, like omeprazole or famotidine.
- Had weight-loss surgery, especially gastric bypass.
- Eat far less on a GLP-1 drug and have cut back on meat, eggs and dairy.
If none of these fits you and your B12 test is normal, a MIC shot is mostly a pricey way to take a vitamin you already have enough of.
MIC B12 Dosage and How Often
Most people get 1 mL a week. AgelessRx, one of the larger telehealth providers, says weekly 1 mL is its most common prescription, with 2 mL a week or 1 mL twice weekly only after talking to a provider.
Always go by your vial's label. Because formulas differ, 1 mL from one pharmacy is not the same dose as 1 mL from another.
MIC B12 Side Effects and Who Should Skip It
Side effects are usually mild. The ones clinics report most often are:
- Soreness, redness or a small lump where you injected
- Mild nausea, stomach upset or loose stools
- Headache or lightheadedness
- Acne flares. High-dose B12 has been linked to acne-like breakouts in case reports (Bahbouhi 2023), and they usually clear after stopping.
Rarely, B12 injections cause allergic reactions, including to cobalt, which sits at the center of the B12 molecule. Get urgent help for hives, swelling of the face or throat, or trouble breathing.
Skip it or ask your doctor first if you
- Have Leber's hereditary optic neuropathy. Cyanocobalamin can worsen it.
- Have severe liver disease or metabolic acidosis. Methionine can make acidosis worse.
- Are pregnant or breastfeeding. There is no safety data for the combined shot.
- Are allergic to cobalt or to any ingredient.
Some clinic pages warn people with a sulfa allergy away from MIC because methionine contains sulfur. Sulfa drug allergies are to sulfonamides, a specific chemical structure methionine doesn't have. Mention the allergy to your prescriber anyway, but it isn't a reason on its own to rule MIC out.
MIC B12 vs Lipo-C vs Plain B12
The names overlap, and so do the ingredients. Here's how the three most common "skinny shots" differ.
If your goal is energy and you're low on B12, a plain B12 shot does the job that matters, often for less. If you want the full lipotropic blend, our Lipo-C guide breaks down the carnitine version.
How Much Do MIC B12 Injections Cost?
Where you buy decides the price. The same weekly shot can cost $2 or $75.
Insurance rarely pays for MIC. It may cover a plain B12 shot if a blood test shows you're deficient, which is another reason to test first.
Where to Buy MIC B12
There are two routes, and they aren't equal.
With a prescription. A clinic or telehealth service prescribes it, and a compounding pharmacy makes it. You get a label with the amount of each ingredient per mL, a pharmacy license behind the vial, and a prescriber who can check your B12 first. It costs more, but every number on this page can be checked against your label.
From a direct vendor. Our partner Nura Peptide sells AdrenaLean (MIC B12), a 30 mL vial of methionine, inositol, choline and cyanocobalamin, for $78. Code PEPTIDEDECK15 takes 15% off, bringing it to $66.30. At 1 mL a week, one vial lasts 30 weeks if you can keep it sterile that long, which works out to $2.21 a shot. (We earn a commission if you buy through this link. It doesn't change the price you pay.)
The honest limits of the direct route
- No amounts per mL. Nura lists the four ingredients but not how much of each, so you can't match a dose to the tables above.
- No current batch certificate yet. The listing says the current lot's certificate of analysis isn't published. Ask for it before you inject.
- No prescription and no label for people. Nura sells it for laboratory use, not as a medicine, so nobody checks whether it suits you.
If you want the cheapest vial and you're comfortable with those gaps, AdrenaLean is the lowest price we've found. If you need stated amounts or have any condition in the list above, use the prescription route.
Frequently Asked Questions
Sources
- Fischer LM, daCosta KA, Kwock L, et al. Sex and menopausal status influence human dietary requirements for the nutrient choline. Am J Clin Nutr. 2007;85(5):1275-85. PMID 17490963.
- Zarezadeh M, Dehghani A, Faghfouri AH, et al. Inositol supplementation and body mass index: a systematic review and meta-analysis of randomized clinical trials. Obes Sci Pract. 2022;8(3):387-397. PMID 35664247.
- Fitz V, Graca S, Mahalingaiah S, et al. Inositol for polycystic ovary syndrome: a systematic review and meta-analysis to inform the 2023 international PCOS guidelines. J Clin Endocrinol Metab. 2024;109(6):1630-1655. PMID 38163998.
- Aroda VR, Edelstein SL, Goldberg RB, et al. Long-term metformin use and vitamin B12 deficiency in the Diabetes Prevention Program Outcomes Study. J Clin Endocrinol Metab. 2016;101(4):1754-61. PMID 26900641.
- Bahbouhi I, et al. Vitamin B12 induced acneiform eruption. Heliyon. 2023. PMID 37305488.
- NIH Office of Dietary Supplements. Vitamin B12 fact sheet for health professionals and Choline fact sheet for health professionals.
- Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. National Academies Press, 2005 (methionine + cysteine requirement, 19 mg/kg/day).
- Empower Pharmacy. Lipo-B (MIC) injection: formulation, route and contraindications.
- AgelessRx. How to dose with B12/MIC.
- Healthline. Lipotropic injections: benefits, side effects, dosage and cost.
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. MIC B12 injections have no FDA approval, and compounded formulas vary. Get your B12 level checked and talk to a doctor before starting injections, especially if you take metformin, are pregnant or have liver disease.