Lipo-C (MIC)
Also known as: Lipo-C · MIC blend · Lipotropic Injection
A vitamin-and-amino-acid injection blend - methionine, inositol, choline, B12, sometimes more. It is not a peptide and it is not a fat-burner. It is an old-school clinic adjunct with decades of use and almost no RCT support.
Overview
Lipo-C, also called a MIC injection or a lipotropic shot, has been a fixture of weight-loss clinics in the United States since the 1960s. The formula varies by compounder, but the core is methionine (a methyl donor), inositol (lipid-signalling cofactor), choline (phosphatidylcholine precursor), and B12 (energy and methylation cofactor). The honest framing: these are nutrients your body uses in fat metabolism. Injecting them bypasses the gut and gives you a clean serum spike. Whether that spike does anything meaningful for fat loss in someone already eating a normal diet is the question fifty years of clinic use has not answered with a single solid randomised trial. People who feel better on it usually attribute the benefit to the B12, which is fair.
Evidence quality
Six decades of clinic use and zero high-quality RCTs comparing MIC injections against placebo for weight loss. The individual components have evidence bases of their own - B12 for fatigue in deficiency, choline for hepatic fat metabolism in deficient states - but the blend as marketed for fat loss has not been studied as a unit. Treat it as a nutrition adjunct with a long safety track record, not as a fat-loss intervention.
Benefits & timeline
Benefits
- Reliable energy bump in the day or two after the shot - largely a B12 effect, more pronounced if the user was subclinically deficient
- Methyl-donor support for users with MTHFR variants or low choline intake (vegetarians and vegans, primarily)
- Cheap, widely compounded, and well tolerated - low barrier to trying it as an adjunct to a real weight-loss programme
- No systemic peptide-class risks; no growth-factor signalling to worry about
Timeline
Week 1
Energy and mood lift within 24-48 hours of the first shot. Most prominent in users with low B12 baseline.
Week 2-4
Subjective energy steadies into a new baseline. No measurable scale change from the injection itself.
Week 4-8
Body composition changes track the diet and training programme, not the injection.
Week 12
End of standard cycle. The injection can be continued indefinitely - these are vitamins - but the marginal value falls once baseline B12 and choline are normalised.
Dosage protocols
Advanced
2 mg
three times weekly
Beginner
1 mg
twice weekly
1 ml of blended formula per injection.
Standard
1 mg
three times weekly
Titration & adjustment
No titration needed — start at full 1 ml IM 2–3× weekly. Adjust frequency, not dose, if you find the injection schedule inconvenient. Stop at any time.
Injection timing
IM injection 2–3× weekly, ideally on training days, 30–60 minutes pre-workout. Rotate sites (glute, deltoid). Avoid same-site repeat injection within a week.
Side effects & contraindications
- mildInjection-site irritation - the blend is intramuscular and can sting.
- mildVitamin-smelling urine for a few hours after the shot. Normal.
- mildSome users report a fishy body odor at higher methionine doses or with carnitine-augmented formulas.
- moderateVery rare allergic reactions to one of the compounded components - usually the preservative, not the active vitamins.
Contraindications
- Known allergy to any component (B12, methionine, inositol, choline, or the preservative in the compound)
- Pregnancy and breastfeeding - dose is unlikely to be harmful but compounded blends are not standardised, so the safe answer is no
- Severe kidney disease - methionine load is not trivial in someone with poor clearance
- Trimethylaminuria (fish-odor syndrome) - the choline and methionine load will make symptoms worse
Reconstitution & injection
Comes pre-mixed in a 10 ml or 30 ml multi-dose vial from the compounding pharmacy. Standard dose is 1 ml intramuscular into glute or deltoid, 2-3 times weekly. No reconstitution math because there is no powder. Rotate sites - the blend can leave a small bump or tender spot at the same injection point if you do not move it around.
Open calculator pre-filledStorage after reconstitution
Pre-mixed multi-dose vial from the compounding pharmacy — no reconstitution math. Refrigerate at 2–8 °C once opened, light-protected (B12 is photosensitive — the bright pink colour fades when exposed to light). Use within 28 days of first puncture, or by the pharmacy expiry date, whichever is earlier. Do not freeze. Inspect: the solution should retain its bright pink/red colour. A pale or amber tint signals B12 photo-degradation — still safe to inject but reduced potency.
Common mistakes
Calling it a peptide.
Better approach: It is not. It is a B-vitamin and amino-acid blend. The honest framing matters because it sets the right expectation. You are not buying a growth-factor signal or a receptor agonist; you are buying a nutrient infusion.
Expecting the shot to drive weight loss without a deficit.
Better approach: The injection does not change calorie balance. It can support energy and methylation, which makes it easier to stick to a deficit, but you have to bring the deficit. If your diet is not in order, no shot will compensate.
Hopping between compounders for the cheapest source.
Better approach: Formulas vary. One compounder's Lipo-C is 10 mg methionine per ml, another's is 25. Pick a compounder, learn how you respond to their formula, and stay with them. Switching mid-cycle introduces a variable you cannot control.
Daily injections.
Better approach: 2-3 times weekly is the historical convention and it is enough. Daily dosing builds up injection-site irritation without improving outcome. Methionine and choline have long enough half-lives that twice weekly is sufficient.
Real-world tips
- Get a serum B12 and folate before starting. If you are deficient, the shot will feel transformative. If you are replete, it will feel like nothing.
- Rotate injection sites - upper outer glute, deltoid, vastus lateralis. Same-site injections leave a tender bump that can last a week.
- Use a 1 inch 25-gauge needle for IM injection in the glute. The 5/8 inch needles some compounders ship with do not reach muscle in larger users.
- If the blend includes carnitine and you notice fishy body odor, drop frequency to twice weekly and see if it resolves.
- Track energy on a 1-10 scale weekly. If you cannot show yourself a real lift after a month, the injection is not adding to your programme.
When something else is the better tool
Oral B12 plus dietary choline
Use instead when: You are replete and want the methyl-donor support without the cost or hassle of injections. Sublingual B12 at 1000 mcg and 3 eggs a day for choline covers most of what the shot delivers, for the cost of the eggs.
Semaglutide or Tirzepatide
Use instead when: Your actual goal is weight loss. Lipo-C is an adjunct at best; the GLP-1 incretins are the tool. If a clinic is selling MIC as a weight-loss treatment without mentioning the incretin options, you are getting a worse intervention than the standard of care.
Doing nothing extra and fixing the diet
Use instead when: You have not yet tightened the food log. The injection cannot compensate for an unmeasured deficit and rough sleep. Build the foundation, then add the adjunct - not the other way around.
- Is this really a peptide?
- No. It is a compounded vitamin-and-amino-acid injection. It gets shelved with peptides because clinics that prescribe peptides usually also offer it.
- Will it actually help me lose weight?
- Not directly. It can support energy and methylation, which can support adherence to a diet, which is where the weight loss actually comes from. The shot is one step removed from the outcome.
- Why am I peeing bright yellow?
- The B-complex in the blend. Normal, expected, harmless.
- Can I run it forever?
- There is no acute reason not to, but the marginal benefit drops once your serum B12 and choline are normalised. After 8-12 weeks, drop to once weekly or stop entirely and use the savings for groceries and a coach.
- Lipo-C versus Fat Blaster - which is better?
- They are very close cousins. Fat Blaster usually adds L-carnitine, which can help training-day energy more than baseline mood. If you do most of your work fasted and lift heavy, Fat Blaster has a slight edge. If you are after general energy and methylation support, Lipo-C is the cleaner pick.