A lipotropic injection is a clinic-made shot of nutrients — usually methionine, inositol and choline, often with vitamin B12 — sold as a fat-burner, and the record behind that claim is empty. No FDA-approved product contains the three main ingredients. The one approved ingredient, B12, is approved for B12 deficiency. And a search of PubMed and ClinicalTrials.gov, set out below so anyone can repeat it, finds no human trial testing the injections for weight loss.
The short answers, census re-run on 10 November 2026. Do fat-burning, MIC or "lipo" shots work? No human trial shows that they do: 44 PubMed records and 1 ClinicalTrials.gov study, and none of them tests an injection for weight loss. How much weight can you lose with lipotropic shots? No trial has measured it, so there is no figure to quote. Are they approved? Drugs@FDA lists no approved application for methionine, inositol or choline chloride, and the approved B12 injection is for B12 deficiency only. The injections that do hold a weight approval are listed, with dates, in the weight-loss injections register.
This page documents what can be checked on 28 October 2026: what goes into the shots, their regulatory status, where the word "lipotropic" comes from, and the census. It reports what clinics claim; it does not endorse the product. The medicines that do have weight-loss trials behind them are on GLP-1 alternatives.
What is in the shot
Clinic menus use several names for the same family of injections — "lipo shots", "lipotropic injections", "MIC", "MIC-B12", "lipo-B" or "skinny shots". The letters stand for the core three:
| Ingredient | What it is | Approved as a drug in the US? |
|---|---|---|
| Methionine | an essential amino acid, eaten in protein | no approved application (Drugs@FDA) |
| Inositol | a sugar alcohol the body makes; studied as a supplement in PCOS | no approved application |
| Choline (as choline chloride) | a nutrient involved in fat transport from the liver | no approved application |
| Cyanocobalamin (vitamin B12), often added | a vitamin | yes — injection approved for B12 deficiency due to malabsorption |
The Drugs@FDA searches were run against FDA's openFDA application data on 28 October 2026, by active-ingredient name; methionine, inositol and choline chloride each returned zero approved applications. Cyanocobalamin returned 62, including injections; the current label we read (Meitheal, effective 12 June 2025) lists pernicious anaemia, gastrointestinal disease or surgery, fish tapeworm, pancreatic or bowel cancer and folic acid deficiency as the conditions behind the deficiency it treats.
Because no approved combination product exists, an injection containing these ingredients is a compounded or otherwise unapproved preparation. Compounded drugs are not reviewed by the FDA for safety, effectiveness or manufacturing quality before they are sold, and the amounts in each vial depend on the pharmacy that made it. Clinic versions sometimes add L-carnitine, other B vitamins or amino acids; the formula a given clinic uses is on its own vial label, not in any public register.
Where "lipotropic" comes from
"Lipotropic" is a term from mid-20th-century nutrition research for substances that prevent fat accumulating in the liver of animals fed a deficient diet. Choline was the classic example, and methionine and B12 were studied for the same effect. One of the oldest records in the census below, a 1965 paper in Toxicology and Applied Pharmacology titled "Lipotropic activity of choline, vitamins B12 and B-126, folic acid, and citrovorum factor", uses the word in exactly that sense. The term describes liver fat in deficiency states, not body fat, and not weight. The marketing use carries the old word into a claim it never made.
The census
Every count below can be re-run. All searches were made on 28 October 2026 and re-run on 10 November 2026 with the same results (PubMed 44; ClinicalTrials.gov 1 and 0).
| Database | Query | Records | Human trials of a lipotropic injection for weight loss |
|---|---|---|---|
| PubMed | (lipotropic[tiab] OR "methionine inositol choline"[tiab] OR "MIC injection"[tiab] OR "lipo injection"[tiab]) AND (weight[tiab] OR obesity[tiab] OR "fat loss"[tiab]) |
44 | 0 |
| PubMed | "vitamin B12"[tiab] AND (injection*[tiab] OR intramuscular[tiab]) AND "weight loss"[tiab] AND randomized controlled trial[pt] |
1 | 0 (a 1997 review of jejunoileal bypass surgery) |
| ClinicalTrials.gov | lipotropic |
1 | 0 (a study of liver disease in intravenous nutrition) |
| ClinicalTrials.gov | methionine inositol choline |
0 | 0 |
What the 44 PubMed records are. Read by title and, where relevant, abstract: most are animal or livestock studies (choline or methionine in hens, ducks, cattle, kittens, broiler chickens and rats), liver-fat biochemistry, or unrelated uses of "lipotropin", a pituitary hormone. The human records are a 2022 narrative review of weight-management supplements, a 2025 umbrella meta-analysis of L-carnitine supplementation, and one 1998 trial of an oral supplement (chromium picolinate, inulin, capsicum, L-phenylalanine "and other lipotropic nutrients") over four weeks of diet and exercise, which found no significant difference in body weight between groups. None tests an injection.
The census has limits: PubMed indexes most but not all journals, a trial could be published under different words, and a search cannot see unpublished clinic data. Its result is narrow and checkable — no indexed human trial of an injected lipotropic product for weight loss — not a claim that no data exists anywhere.
What clinics say, and what can be checked
Clinic and med-spa pages returned by a web search on 28 October 2026 describe lipotropic shots in terms such as burning fat, supporting metabolism or raising energy, and often sell them inside a weight-loss programme with a diet plan or regular visits. Each of those claims is the clinic's own. Two things about them can be stated as fact:
- A diet sold with the shot confounds any result. Where a clinic's programme combines injections with a calorie target, the weight change cannot be attributed to the injection — the same problem the GLP-1 trials solve with a placebo arm, as our page on the diet in the GLP-1 trials shows.
- "Energy" from B12 is established only for deficiency. The approved B12 label treats deficiency. People who are deficient may feel better when it is corrected; the census found no trial of B12 injections for weight loss in people who are not.
Where a clinic sells a blend that also contains compounded semaglutide or tirzepatide, the GLP-1 ingredient is the one with trial evidence for weight loss, and the compounded product itself is not FDA-approved; the legal position of compounded GLP-1s since the shortages ended is on compounded semaglutide and compounded tirzepatide vs Zepbound.
Who should think about B12
B12 deficiency is real and testable, and one group is directly relevant here: long-term metformin users. The American Diabetes Association's 2026 Standards of Care say metformin "is also associated with increased risk of vitamin B12 deficiency and worsening of symptoms of neuropathy" and suggest periodic testing of B12 levels. The 2025 joint nutrition advisory on GLP-1 therapy lists B12 among nutrients that "can be proactively considered" for people eating much less; that advisory is summarised on our page on what to eat on a GLP-1. Diagnosis is a blood test ordered by a clinician; the approved B12 injection exists for people whose test shows a deficiency. Metformin's own weight record is on does metformin help weight loss.
What this page cannot tell you
- Whether any individual has lost weight with these shots. Anecdotes and before-and-after photos are not in a trial; none could be found that is.
- What is in a particular vial. Compounded formulas vary by pharmacy and are not published in a register.
- Safety in any detail. With no trials there are no adverse-event rates; FDA's adverse-event system records reports, not rates, and we did not run a FAERS search for this page.
Anyone considering injections, or wondering about a B12 deficiency, is best served by a clinician who can test and prescribe.
Sources
- FDA, Drugs@FDA application data via openFDA (
drug/drugsfda), searched by active ingredient (methionine, inositol, choline chloride, cyanocobalamin), 28 October 2026. - Cyanocobalamin injection, US prescribing information (Meitheal Pharmaceuticals), effective 12 June 2025, set ID 064c6841-3ed2-417f-a77c-a730785b6036, openFDA label record, read 28 October 2026.
- PubMed (NCBI E-utilities), the queries in the census table, run 28 October 2026; records cited: Laird RD et al., Toxicol Appl Pharmacol 1965, PMID 14298016; Hoeger WW et al., Adv Ther 1998, PMID 10345151.
- ClinicalTrials.gov API v2, queries
lipotropicandmethionine inositol choline, 28 October 2026. - American Diabetes Association. "9. Pharmacologic Approaches to Glycemic Treatment: Standards of Care in Diabetes—2026." Diabetes Care 2026;49(Suppl 1), doi:10.2337/dc26-S009.
- Mozaffarian D et al. "Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory…" Am J Clin Nutr 2025;122(1):344–367, PMID 40450457.