L-Carnitine
Also known as: Levocarnitine, L-Carnitine Injectable, Carnitine
Amino Acid Derivative | Fatty Acid Transporter
Overview
L-Carnitine is an amino acid derivative naturally produced in the body and essential for transporting long-chain fatty acids into mitochondria for energy production. Injectable forms bypass digestive absorption limitations of oral supplements.
Key benefits
- Enhanced fatty acid transport to mitochondria
- Improved energy production from fats
- Better bioavailability than oral forms
- Support for exercise recovery
- Potential cognitive benefits
Mechanism of action
Acts as a carrier molecule, shuttling long-chain fatty acids across the inner mitochondrial membrane via the carnitine palmitoyltransferase (CPT) system. This is the rate-limiting step in fatty acid oxidation for energy production.
Molecular data
- Type
- Quaternary ammonium compound
- Half-life
- ~2-3 hours (injectable)
Indications
What the research community uses this compound for, with self-reported effectiveness.
Metabolic
Performance
Clinical Uses
Dosing protocols
Common protocols by delivery method. Adjust the curve below to model accumulation in your own cycle.
Delivery method
| Protocol | Dose | Frequency | Duration |
|---|---|---|---|
| — | 50-100mg | Daily | — |
| — | 100-200mg | Daily | — |
| — | 100-200mg | 30-60 min before exercise | — |
Safety
Reported adverse effects, contraindications, and what to monitor on cycle.
Common side effects
- Injection site reactions
- Mild nausea
- Body odor (fishy smell at high doses)
Contraindications
- Seizure disorders (may lower seizure threshold)
- Hypothyroidism (may affect thyroid function)
- Allergy to carnitine products
Monitoring
- Generally well-tolerated with established safety profile
- FDA-approved for carnitine deficiency
- Monitor thyroid function if on thyroid medication