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For research and educational purposes only. Not intended for human consumption.

L-Carnitine

Extensively Studied
Updated Dec 2025

Amino Acid Derivative | Energy & Fat Metabolism

InjectableOral
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500-2000mg
1-3x weekly
Injectable
IM: Gluteal
Ongoing or 8-12 weeks
Typical duration
Room
Storage

Overview

What is L-Carnitine?

L-Carnitine (levocarnitine) is a naturally occurring amino acid derivative essential for transporting long-chain fatty acids into mitochondria for energy production. Synthesized from lysine and methionine, it plays critical roles in energy metabolism. FDA-approved as Carnitor® for treating carnitine deficiency. Injectable form provides 100% bioavailability vs 14-18% oral.

Key Benefits

Maximum bioavailability (100% injectable), rapid onset, bypasses gut conversion to TMAO, supports fat metabolism and cardiovascular health, FDA-approved for deficiency.

Mechanism of Action

Injectable L-Carnitine delivers directly to circulation, providing immediate availability for fatty acid transport into mitochondria for beta-oxidation and ATP production.

Molecular Information

161.20 Da
Weight
0
amino acids
Amino acid derivative
Type
Amino Acid Sequence:
N/A - quaternary ammonium compound
* FDA-approved as Carnitor® for carnitine deficiency and dialysis patients

Pharmacokinetics

Peak
3.5 hours
Half-life
17 hours
Cleared
~3.5 days
100%50%0%0h6h12h18h24h
Peak
Half-life
Cleared
FDA Carnitor Label

Research Indications

Carnitine Deficiency

FDA-approved for primary and secondary carnitine deficiency.

Dialysis Support

FDA-approved for ESRD patients who lose carnitine during hemodialysis.

Fat Metabolism

Enhanced fatty acid oxidation and energy production.

Research Protocols

Disclaimer: Injectable L-Carnitine is FDA-approved for carnitine deficiency and dialysis patients.

GoalDoseFrequencyRoute
Carnitine Deficiency50 mg/kg/dayDivided dosesIV
Hemodialysis10-20 mg/kgPost-dialysisIV slow push
Fat Metabolism/Performance500-1500mg1-3x weeklyIM or SubQ

Timing: Can be administered any time. For exercise, some administer 1-2 hours before training.

Peptide Interactions

How to Reconstitute

Important: Always use bacteriostatic water (BAC). Sterile technique is essential.

1

L-Carnitine injectable comes pre-mixed

2

Check solution clarity - should be clear

3

For IV: May dilute in saline

4

For IM: Draw directly from vial

5

Clean injection site thoroughly

Dosing Calculator

Calculate your injection volume with visual dosing guide

FINAL CONCENTRATION
2.50mg/mL
Each milliliter contains 2.50 mg of peptide
VISUAL REFERENCE (RESEARCH USE ONLY)

To obtain 250 mcg from this solution:

Draw 0.10 mL=10 units

(1 mL = 100 units on any insulin syringe)

0102030405060708090100
00.10.20.30.40.50.60.70.80.91.0
0.10 mL
10 units

Draw to this mark for 250 mcg

This calculator is for research purposes only. Always verify calculations and consult protocols.

Quality Indicators

Clear, colorless solution

Clear to slightly yellow with no particles.

Proper pharmaceutical labeling

Lot number and expiration date.

Cloudy or particulate

Do not use if contaminated.

What to Expect

  • Days 1-7: Normalized carnitine levels, potential energy improvements
  • Weeks 2-4: Enhanced fat utilization during exercise
  • Weeks 4-8: Sustained metabolic benefits, body composition changes

Side Effects & Safety

Side Effects

  • FDA-approved - well-established safety profile
  • Injection site discomfort possible
  • High doses may cause fishy body odor
  • Use caution in hypothyroidism
  • Monitor if on anticoagulants

When to Stop

  • Unusual odor (high doses)
  • Injection site infection
  • As directed by provider

References

2 Studies

Weight Loss Meta-Analysis (2020)

37 RCTs | 2,292 participants | −1.21 kg body weight

Significant decreases in body weight, BMI (−0.24), and fat mass (−2.08 kg).

Cardiovascular Meta-Analysis (2013)

13 trials | 3,629 participants | 27% mortality reduction

27% all-cause mortality reduction post-MI, 65% reduction in arrhythmias.

Quick Start Guide

Typical Dose
500-1000mg
How Often
2-3x weekly
Where to Inject
IM: gluteal
Timing
Any time; before exercise for performance
Effects Timeline
Immediate availability; metabolic effects within days
Storage
Room temp unopened; refrigerate after opening
Cycle Length
Ongoing or 8-12 weeks
Break Between
Not typically required

Research Disclaimer

L-Carnitine is sold for laboratory research purposes only and is not intended for human or animal consumption. The information provided on this page is compiled from published research, veterinary studies, and anecdotal reports for educational purposes. This content does not constitute medical advice, diagnosis, or treatment recommendations. Any research involving L-Carnitine must comply with all applicable local, state, and federal regulations. BioInfinity Lab makes no claims regarding the safety or efficacy of L-Carnitine for any purpose. Consult qualified professionals for any research applications.