L-Carnitine
The file here is mostly preclinical work plus clinic and community practice, not registrational trials.
An amino acid derivative rather than a peptide. Injection site soreness is the most consistent complaint.
General profile
- Class
- Mitochondrial and metabolic
- Evidence
- Mixed or moderate evidence
- Studied dose range
- 200–500 mg
- Frequency in protocols
- 2–3× weekly
- Route
- Intramuscular or subcutaneous
- Half life
- ~15 hours
- Reconstitution
- Supplied as a solution
- Storage
- Room temperature, light-protected
Timing and cycling in the literature
Usually dosed in the morning window
Two to three times weekly
Usually placed before activity in the protocols. Injection site soreness is common, so rotating sites matters more than the hour.
Reported cycle: 8 weeks on, 4 weeks off
Carnitine stores load slowly, so protocols use multi-week blocks.
Watch for: Injection site pain, which is the most common complaint, and a fishy body odour at higher amounts.
What it conflicts with
Three separate questions, kept separate. A hard stop means the mechanisms must not run together at all and timing does not fix it. A syringe rule means the same day is fine but one barrel is not. Redundancy is not dangerous, it is paying twice to hit one target.
No named pair conflicts are on file for this compound. That is missing data, not clearance: with no compatibility data the default is separate syringes, and you still introduce one new compound at a time.
Most syringe compatibility claims here are practice and expert consensus, not peer reviewed mixing studies. A clear liquid after mixing does not prove the compounds are still active, and cloudiness, particles or gelling means discard. Active cancer, pregnancy, major cardiac care and heavy immunosuppression override every stack preference on this page.
See how L-Carnitine fits your week
The injection scheduler spaces doses using the clinical timing data, flags the pairs above before you draw them, and tells you why.
Model this in the injection schedulerThe studies
Human trials: No completed human efficacy trial that establishes a dose for the use people are chasing.
Open questions: Treat published dosing as observed practice, not a validated protocol.
Published papers
Indexed from Europe PMC and refreshed weekly. Each link opens the paper itself.
- Recent advances in the bioanalysis of acylcarnitines: Methodologies, challenges, and clinical perspectives
Pharm Sci Adv · 2026 · Review. Zheng J, Chen W, Qin F, Zhang P, Xu F.
- Guilu Erxian oral liquid alleviates oligoasthenospermia via the mitochondria-complement-NETs network
J Ethnopharmacol · 2026. Yue Q, Tong K, Feng Q, Chang H, Zhang Z, Xu X, Pan T, Xu Z, Chen L, Liu J, Liu Z.
- Cardiovascular-kidney-metabolic syndrome through the lens of gut‑derived uremic toxins
Gut Microbes · 2026 · Review. Xu C, Snelson M, Marques FZ.
- Recent advances and clinical relevance of microbiome dynamics in health and disease
Gut Microbes · 2026 · Review. Gavanji S, Suhail M, Bencurova E, Dandekar T, Othman EM.
- From gut microbiota metabolism to microvascular injury: Exploring the role and mechanisms of gut microbiota in obesity-induced coronary microcirculation dysfunction
Virulence · 2026 · Review. Liu Y, Wang Y, Teng H, Nie W, Qiao X, Shen Y, Wang Z, Yao X.
- Increasing plant protein sources in the diet modulates gut microbiota and tryptophan metabolism in men at cardiometabolic risk
Gut Microbes · 2026. Lépine G, Davila AM, Cueff G, Pickering G, Ichou F, Perreau C, Lefranc-Millot C, Gilles M, Thirion F, Mariotti F, Rémond D, Fouillet H, Polakof S.
- The gut-bone axis: microbial metabolism and nutritional interventions for bone health
Gut Microbes · 2026 · Review. Rodriguez-Bryant A, Papageorgiou M, Horcajada MN, Biver E, Ferrari S, Bonnet N.
- Peritoneal dialysis in lupus nephritis: comparative outcomes vs. hemodialysis, risk stratification, and modality selection framework
Ren Fail · 2026 · Review. Cheng S, Peng D, Wang X, Yu L, Ren G, Zhang Z, Liu Z.
- The plasma metabolome and clinical features of patients with coeliac disease in Northwest China
Ann Med · 2026. Zhang W, Wu X, Li Y, Huang Z, Hui W, Shi T, Lu W, Bai H, Wu Q, Wang M, Liu K, Xu L, Gao F, Wu J.
- Creatine monohydrate for lean mass, strength, and bone density in postmenopausal women: a systematic review and meta-analysis
J Int Soc Sports Nutr · 2026 · Review. Naddafha S, Antonio J, Kreider RB, Stout JR.
Search the full literature
- PubMed: all indexed papers
Every indexed paper, newest first. Filter to Clinical Trial or Review in the sidebar.
- PubMed: human clinical trials only
The honest test of an evidence claim. An empty result is itself an answer.
- ClinicalTrials.gov registrations
Registered, ongoing and completed trials, including ones that never published.
- Europe PMC full text
Often surfaces open-access full text that PubMed only abstracts.