B12 and lipotropic shots: what the injection is approved to do
The B12 shot is real medicine with a narrow job. Cyanocobalamin injection is approved for vitamin B12 deficiency caused by malabsorption — pernicious anemia, gut surgery, a few other conditions — and its own label says that when your requirement is simply higher than usual, oral supplementation will usually cover it. Nothing in that approval is about weight.
What this comes down to
- Cyanocobalamin injection at 1 mg/mL is an approved prescription drug. Its indication is B12 deficiency due to malabsorption, not fatigue and not weight loss.
- The label says requirements above normal can usually be met with oral supplementation, and tells prescribers to avoid the intravenous route because most of the dose is lost in urine.
- No randomized trial supports a B12 injection for weight loss. Four randomized trials touch lipotropic ingredients at all, and none of them tests a MIC injection.
- Where a shot is sold at an introductory rate, the renewal is what recurs. Two of the lines we have priced advertise one figure and bill another.
What a B12 injection is approved to treat
Cyanocobalamin injection is indicated for vitamin B12 deficiencies due to malabsorption: pernicious anemia, gut disease or surgery including gastrectomy, fish tapeworm infestation, pancreatic or bowel cancer, and folic acid deficiency[1]. For pernicious anemia the label prescribes 100 mcg daily for six or seven days, then a maintenance dose monthly for life.
“Requirements of vitamin B 12 in excess of normal (due to pregnancy, thyrotoxicosis, hemolytic anemia, hemorrhage, malignancy, hepatic and renal disease) can usually be met with oral supplementation.”
[1]
The injection exists because some people can't absorb B12 through the gut. If you can, the label's position is that a tablet does the job. Blood work is what separates those two situations, and it's worth asking whether yours was drawn before the shot was recommended.
The weight-loss claim, and the search behind it
B12 is a well-studied vitamin: 665 randomized trials in humans through a standard trial filter. Add an injection term and a weight term to the same query and the count drops to one, and that one paper is a review of jejunoileal bypass surgery from 1997 — a false hit, not a trial of a B12 shot.
PubMed, via the E-utilities API
("vitamin B12"[tiab] OR cyanocobalamin[tiab]) AND (injection*[tiab] OR intramuscular[tiab] OR "shot"[tiab]) AND ("weight loss"[tiab] OR obesity[tiab]) AND "randomized controlled trial"[pt] AND "humans"[mh]Returned 1. Positive control — vitamin B12 overall, identical trial filter — returned 665 through the identical filter in the same session.
The single hit is a 1997 review of twenty years of jejunoileal bypass surgery, in a gastroenterology journal. It is a surgical review, not a trial of a B12 shot for weight loss. Counting it would be generous; the honest number is zero.
MIC, MICC and lipotropic shots
MIC stands for methionine, inositol and choline, usually mixed with B12 and sometimes with other ingredients. Searched together through the same trial filter, those three return four randomized trials in the whole of PubMed. Read by title, none of them tests a MIC injection for weight.
PubMed, via the E-utilities API
(lipotropic[tiab] OR ("methionine"[tiab] AND "inositol"[tiab] AND "choline"[tiab])) AND "randomized controlled trial"[pt] AND "humans"[mh]Returned 4. Positive control — choline alone, identical filter — returned 458 through the identical filter in the same session.
The four, by title: a 1998 four-week dietary supplement study of body composition, a 1997 trial of choline in asthma, a 1983 Italian study of a lipotropic preparation, and a 1969 trial of lipotropic enzymes in dementia. The control shows the filter finds choline trials by the hundred, so the number four is about the topic and not the ruler.
There's a regulatory difference buried in that list as well. Cyanocobalamin is the active ingredient of approved products, which satisfies the second of the three conditions a 503A pharmacy needs[4], while no approved product combines methionine, inositol and choline as an injection at all[2]. A MIC shot is compounded, and compounded drugs aren't reviewed by the FDA for safety, effectiveness or quality before they're sold[3].
This is not a safety warning. Cyanocobalamin injection is an approved product with a long-established use, and the question here is what your money buys, not whether the shot will hurt you.
What these shots cost
Seven lines on our roster are a B12 or lipotropic injection, from $69 to $200 a month. Two of them advertise a lower first-month rate than the one that recurs — NiceRx's MIC and B12 injection is advertised at $65 and renews at $115. That pattern has its own article.
| Seller | What it is called | A month |
|---|---|---|
| Green Cap Health | MICC injection | $69 |
| WePeptideRx | vitamin B12 injection | $99 |
| NiceRx | MIC and B12 injection | $115 |
| NiceRx | B12 injection | $119 |
| Invyncible | glutathione and methylcobalamin | $126 |
| Unique Physique | Super Lipo-B and lidocaine injection | $200 |
| Unique Physique | Lipo-Mino injection | $200 |
B12 and lipotropic injection prices on the sellers we have read first-hand
A shot billed monthly is a recurring charge whether or not it's called a membership, and it stacks on top of whatever the medication costs. The calculator keeps those separate, because the sellers' own pages usually don't.
Questions people actually ask
Do B12 shots help you lose weight?
No randomized trial has shown that. PubMed returns 665 randomized trials of vitamin B12 in humans; narrowed to injections and weight, it returns a single paper, and that paper is a 1997 review of bypass surgery rather than a trial of a B12 shot.
What is a MIC or lipotropic injection?
Methionine, inositol and choline, usually combined with vitamin B12. Those three ingredients together return four randomized trials in the whole of PubMed, and none of the four tests an injection of that mixture for weight, while choline alone returns 458 trials through the same filter.
Is a B12 injection better than a B12 pill?
It's when you can't absorb B12 through the gut, which is what the injection is approved for. The approved label's own position is that requirements higher than normal for other reasons can usually be met with oral supplementation. A blood test is what tells those two situations apart.
Are B12 injections safe?
B12 is water-soluble with a wide safety margin, and these are among the lower-risk items on a telehealth menu. The approved label does say to avoid the intravenous route, because almost all of an intravenous dose is lost in the urine rather than used.
Sources
Every source here was fetched and read for this article, with the identifier taken off the record that came back and the claim it supports written down beside it. All of it was read in September 2026, the same session the rest of this page draws on.
- Cyanocobalamin injection, USP — FDA prescribing information. U.S. Food and Drug Administration, Structured Product Labeling, 2025. Source · Document dated June 2025The approved indication — vitamin B12 deficiency due to malabsorption, with the listed conditions; the verbatim sentence that requirements above normal can usually be met with oral supplementation; the pernicious anemia dosing schedule; and the instruction to avoid the intravenous route.
- Drugs@FDA: FDA-Approved Drugs, queried through the openFDA API. U.S. Food and Drug Administration, 2026. Source · Cyanocobalamin resolves to 62 applications. The currently marketed single-ingredient injections are 1 mg/mL products; there is no approved cyanocobalamin product indicated for weight loss, and no approved product combining methionine, inositol and choline as an injection.
- Compounding and the FDA: Questions and Answers. U.S. Food and Drug Administration, 2025. Source · Document dated September 2025Compounded drugs are not FDA approved, and consumers buying through telehealth platforms may not know the identity of the compounder that produced the drug.
- Bulk Drug Substances Used in Compounding Under Section 503A of the FD&C Act. U.S. Food and Drug Administration, 2026. Source · Document dated May 2026The three conditions a bulk substance must meet under section 503A, of which cyanocobalamin meets the second: it is a component of FDA-approved drug products.