L-Carnitine Injection: FDA-Approved Use vs Off-Label Fat Loss

Injectable levocarnitine, the active form of carnitine. FDA approved it as CARNITOR to treat diagnosed carnitine deficiency, including in dialysis patients. Weight-loss and aesthetic clinics also sell it off-label, alone or in a "LIPO-C" blend with methionine, inositol and choline, as a fat-burning shot for people without deficiency.

It depends on the use. For the approved deficiency treatment, the label sets a weight-based intravenous dose. For off-label fat loss, clinic sources describe 200-2,000 mg per injection, 1-3 times a week, which is common practice, not FDA-reviewed. The dosing page covers both separately.

FDA's label for the approved use warns of serious allergic reactions (anaphylaxis, laryngeal edema, bronchospasm), some within minutes of an IV dose, and postmarketing reports of seizures. Those warnings come from the approved use. The off-label fat-loss use has no comparable FDA-reviewed safety record.

Not established for the injection. The clearest human evidence is a meta-analysis of 37 randomised trials of oral L-carnitine, which found modest drops in body weight and fat mass; in the high-quality trials only the body-weight effect held. That is real trial evidence, but for capsules. I found no comparable trial of the off-label injection.

Levocarnitine carries long-chain fatty acids into mitochondria so they can be burned for energy. In some inherited metabolic disorders it also helps clear toxic compounds. The approved injection restores carnitine in people with diagnosed deficiency. Whether extra carnitine speeds fat loss when levels are already normal is a much less established claim.

Not on the evidence available. The meta-analysis of 37 randomised trials of oral L-carnitine found no significant effect on waist circumference or body fat percentage. The modest effect was on body weight and fat mass, and only body weight held in the high-quality trials. I found no trial of the injection for belly fat.

No. Ozempic is semaglutide, an FDA-approved GLP-1 receptor agonist. L-carnitine is an amino-acid derivative, not a peptide, and its only approved use is treating carnitine deficiency. Its weight-loss evidence is a modest effect from oral supplements, and I found no trial comparing the two. See the [semaglutide page](/semaglutide/) for what that drug's label covers.

Not in the off-label fat-loss protocols clinics describe. Those give 200-2,000 mg into muscle or under the skin 1-3 times a week, which is common practice, not FDA-reviewed. The approved deficiency treatment is a different, weight-based IV regimen set by a prescriber. See the [dosing page](/l-carnitine-dosage/) for both.

I found no trial that answers that for the injection. The best human evidence, a meta-analysis of 37 randomised trials of oral L-carnitine, found average drops of about 1.21 kg in body weight and 2.08 kg in fat mass. Only the body-weight result held in the high-quality trials.

Levocarnitine is sold under the brand names Carnitor and Carnitor SF, made by Leadiant Biosciences. Carnitor is approved for injection: secondary carnitine deficiency caused by an inherited metabolic disorder, and preventing and treating carnitine deficiency in people with end-stage kidney disease on dialysis; tablets and oral solution: primary systemic carnitine deficiency and secondary carnitine deficiency caused by an inherited metabolic disorder. Carnitor SF is approved for primary systemic carnitine deficiency, and secondary carnitine deficiency caused by an inherited metabolic disorder.

The generic name for Carnitor is levocarnitine. Carnitor is Leadiant Biosciences's brand, approved for injection: secondary carnitine deficiency caused by an inherited metabolic disorder, and preventing and treating carnitine deficiency in people with end-stage kidney disease on dialysis; tablets and oral solution: primary systemic carnitine deficiency and secondary carnitine deficiency caused by an inherited metabolic disorder.

The generic name for Carnitor SF is levocarnitine. Carnitor SF is Leadiant Biosciences's brand, approved for primary systemic carnitine deficiency, and secondary carnitine deficiency caused by an inherited metabolic disorder.

Yes. Carnitor is a brand of levocarnitine, made by Leadiant Biosciences: the active ingredient is levocarnitine. It comes as a intravenous injection (1 g/5 mL vial), 330 mg tablet, or oral solution (1 g/10 mL), dosed at injection: 50 mg/kg for metabolic disorders, or 10 to 20 mg/kg after each dialysis session; tablets: 990 mg two or three times a day in adults. Compounded or research-vial levocarnitine is not Carnitor and has not been through its FDA review.

Yes. Carnitor SF is a brand of levocarnitine, made by Leadiant Biosciences: the active ingredient is levocarnitine. It comes as a sugar-free oral solution (1 g/10 mL), dosed at adults: 1 to 3 g a day, starting at 1 g a day; children: 50 to 100 mg/kg a day. Compounded or research-vial levocarnitine is not Carnitor SF and has not been through its FDA review.

Carnitor and Carnitor SF contain the same active ingredient, levocarnitine, and both are made by Leadiant Biosciences. They are approved for different uses and doses: Carnitor for injection: secondary carnitine deficiency caused by an inherited metabolic disorder, and preventing and treating carnitine deficiency in people with end-stage kidney disease on dialysis; tablets and oral solution: primary systemic carnitine deficiency and secondary carnitine deficiency caused by an inherited metabolic disorder (injection: 50 mg/kg for metabolic disorders, or 10 to 20 mg/kg after each dialysis session; tablets: 990 mg two or three times a day in adults); Carnitor SF for primary systemic carnitine deficiency, and secondary carnitine deficiency caused by an inherited metabolic disorder (adults: 1 to 3 g a day, starting at 1 g a day; children: 50 to 100 mg/kg a day).