L-Carnitine

L-Carnitine is an amino acid derivative that transports fatty acids into mitochondria for energy production, commonly used via injection for fat loss and exercise recovery. People typically run community dosing ranging from 200 mg to 900 mg per day, with frequent mentions of 500 mg and 600 mg doses, predominantly via intramuscular injection. Injection-site reactions, edema or fluid retention, and nausea or GI discomfort have each been reported once among users.

Half-life~17.4 h

Data last updated

ClinicalResearchDepthClinicalResearchEfficacyClinicalResearchSideEffectsAnecdotalEfficacyAnecdotalSideEffectsPrice3.53.81.73.63.25.0

Research Evidence

Evidence shape

L-Carnitine has moderate human evidence across multiple indications, with the strongest support coming from blinded trials in septic shock, spinal muscular atrophy, and prematurity. Despite 140 registered trials and testing in 111 indications, only three have posted results, reflecting a long-tail of single-trial or exploratory studies without broader replication. The absence of published human studies for many listed indications, including several serious conditions, means much of the cited research remains preliminary or unreported.

Depthhow much
141 registered trials
77 completed · 11 with posted results · 19 recruiting / active · combined n=738
Breadthhow many areas
114 indications mapped
3 with results · 101 thin / exploratory · 1 animal-only · 97 single-trial long-tail
Qualityhow rigorous
Highest tier: Phase 3
8 blinded with results · 54 distinct sponsors · AE rows aggregated from 7 trials · 26 linked publications on registered trials
Breadth and depth191 rows captured
Human
direct clinical signal
173
Animal
translational support
12
In vitro
mechanistic support
6
HighMediumLow

Anecdotal efficacy

L-Carnitine side effects

Clinical research side effects

Anecdotal side effects

Price

Full buying guide →
1
Alpha Omega Peptide
USA
5000 mg
$60.00
$0.01/mg
2
Biopeptidex
--
5000 mg
$75.00
$0.01/mg
3
Chameleon Peptides
--
6000 mg
$39.50
$0.01/mg
4
Mrbeetoe
--
6000 mg
$55.00
$0.01/mg
5
Simple Peptide
unknown
5000 mg
$60.00
$0.01/mg
6
Novavitality
GB
1200 mg
$14.76
$0.013/mg

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L-Carnitine dosing & protocol

How L-Carnitine is dosed across research, clinician, and community sources — each evidence tier kept separate so the dose range, frequency, timing, and cycling stay visible without flattening different levels of evidence.

Research trials
Published clinical-trial protocols · n = 106
Typical dose
500 mg100 mg – 2970 mg
typical
0
1000 mg
2000 mg
3000 mg
distribution of 32 reported doses · darker = more
Frequency
daily
Route
oral

In research trials, L‑carnitine was administered orally at doses ranging from 100 mg to 2 970 mg per day, with a frequent regimen of 500 mg daily or weight‑based dosing of 1–500 mg/kg each day.

106 sources
Clinician practice
Doctor & published-protocol guidance
Typical dose
0
typical
0
1000 mg
2000 mg
3000 mg
single reported dose

No structured protocol details captured for this tier yet.

In the clinician practice tier, the reported typical dose of L‑carnitine is 0 mcg, with a dose range of 0 mcg to 0 mcg.

Anecdotal
Community-reported real-world use
Typical dose
—
0
1000 mg
2000 mg
3000 mg
no dose captured for this tier yet
Frequency
unspecified
Route
IM

According to community anecdotal data, dosing typically falls between 200 mg and 900 mg per day administered intramuscularly, with frequent reference to 500 mg or 600 mg amounts.

Regulatory safety notes

Contraindications
  • • CONTRAINDICATIONS None known.
Drug interactions
  • • Drug Interactions Reports of INR increase with the use of warfarin have been observed. It is recommended that INR levels be monitored in patients on warfarin therapy after the initiation of treatment with levocarnitine or after dose adjustments.

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