L-Carnitine
Once to twice weekly intramuscular protocol for metabolic and weight-management research.
L-Carnitine is an amino acid derivative that shuttles fatty acids into mitochondria for oxidation, with decades of clinical use behind the injectable form. The protocol below uses pre-mixed solution intramuscularly on training or fasted-cardio days.
Quick answer: L-Carnitine is typically run at 500 mg IM, once to twice weekly intramuscular, as a pre-mixed solution.
Get L-Carnitine → code PEPDOSE
Protocol overview
Dosing & reconstitution
Frequency: Once to twice weekly intramuscular
Typical duration: 8-12 weeks
This compound typically ships as a pre-mixed solution and does not require reconstitution.
| Phase | Dose | Units per injection |
|---|---|---|
| Weeks 1-12 | 500 mg IM | 1 mL of 500 mg/mL pre-mixed solution |
Units = (dose ÷ concentration) × 100 on a U-100 syringe. Change the vial size or water volume and the calculator redoes all of this for you.
Track this protocol → Free account · log doses, rotate sites, never lose your history
L-Carnitine dosing schedule
From the approved levocarnitine label. Read the indication carefully — this is deficiency replacement, and the trials behind it studied deficient patients. It is not a body-composition protocol.
| Phase | Amount | Frequency | Notes |
|---|---|---|---|
| Approved IV use | 50 mg/kg | Loading, then divided doses | From the label for acute and chronic carnitine deficiency. |
| Approved oral use | 990 mg | Two to three times daily | Tablet strength and frequency from the same label. |
Study length: Ongoing replacement in the deficiency indication rather than a fixed cycle.
Reconstitution and measurement
This part is arithmetic and does not depend on the evidence level. Concentration is vial size divided by the bacteriostatic water you add. Draw volume is your target amount divided by that concentration. Units are draw volume times 100, because a U-100 syringe reads 100 units per millilitre. Common vials for L-Carnitine: 5000 mg.
- Wipe the stoppers of both vials with an alcohol swab and let them dry.
- Draw the bacteriostatic water with a sterile syringe and inject it slowly down the inside wall of the peptide vial — never straight onto the powder.
- Swirl gently until the solution is clear. Do not shake; foaming and agitation damage peptides.
- Label the vial with the date and concentration, and refrigerate at 2–8 °C protected from light.
Worked example at the calculator defaults: 5000 mg + 25 mL of bacteriostatic water = 200 mg/mL, so on a U-100 insulin syringe 1 unit = 2 mg of L-Carnitine. Change either input and the calculator redoes this for you.
Storage and stability
Supplies math
Whatever amounts your research uses, the planning arithmetic is the same. The calculator runs all of this per compound.
Important notes
Practical considerations for consistency and safety.
- Use a new sterile insulin syringe for each injection and dispose in a proper sharps container.
- Rotate intramuscular injection sites (deltoid, vastus lateralis, gluteus medius) and use the appropriate needle gauge for the muscle.
- Inject slowly and steadily; wait a few seconds before withdrawing the needle to ensure complete delivery.
- Administer on the same day each week for consistency. If a dose is missed, administer as soon as possible within a few days.
How L-Carnitine works
Transports long-chain fatty acids across the inner mitochondrial membrane for beta-oxidation. Levocarnitine is an approved drug for primary and secondary carnitine deficiency.
Benefits & side effects
Potential benefits
- Approved for carnitine deficiency replacement
- Supports fatty acid transport into mitochondria
- Well-established safety profile
- Available in oral and injectable forms
Possible side effects
- GI effects and body odour at higher doses (from label)
- Injection site reactions with IM administration
- Trimethylamine production in some individuals
- Generally well tolerated at standard doses
This list reflects published literature and community reports. Individual responses vary. Not medical advice.
Bloodwork worth tracking
The community-standard practice is a baseline panel before starting, a recheck 8 to 12 weeks in, and another after time off. For L-Carnitine, the markers most worth watching:
CMPCBCcarnitine levels
Typical time off: No fixed time off
Lab panels are how a research protocol stays honest: numbers move before symptoms do. Interpretation belongs with a clinician. Not medical advice.
Lifestyle factors
None of the literature above was run on a background of poor sleep and no protein. These variables move outcomes more reliably than any compound on this site.
- Protein in the 1.6 to 2.2 g/kg range preserves lean mass through any body-composition phase.
- Resistance training 2 to 4 days per week plus 150+ minutes of weekly aerobic work reinforces whatever the protocol is doing.
- Sleep is the recovery window: 7 to 9 hours at consistent times.
- Hydration matters more than usual on compounds with GI or flushing effects: 2 to 3 liters daily.
- Track the variables that matter: weigh-ins, measurements, photos, and labs at sensible intervals.
Subcutaneous technique and practical notes
General best practice from clinical injection guidance — the same fundamentals nurses are taught, none of it specific to any compound.
References
Quick answers
Does L-Carnitine have human trial data?
Yes. The dosing on this page is anchored to published human research (Levocarnitine prescribing information, carnitine deficiency indication).
How does L-Carnitine work?
Transports long-chain fatty acids across the inner mitochondrial membrane for beta-oxidation. Levocarnitine is an approved drug for primary and secondary carnitine deficiency.
Sourcing L-Carnitine
Whatever you are working with, the documentation matters more than the price. Ask for a batch certificate of analysis whose lot number matches the vial you actually receive — a COA for a different batch tells you nothing about yours.
L-Carnitine at Summit Research Supply → Grade a COA first
Summit is the supplier we feature and an affiliate link. Our COA checklist applies the same way to any vendor.
