L-Carnitine and Cardiovascular Outcomes: Meta-Analysis
Mayo Clinic Proceedings (2013)
L-carnitine supplementation after MI reduced all-cause mortality by 27%, ventricular arrhythmias by 65%, and angina by 40%.
How it works
Marek's Guided Optimization® Program combines advanced lab testing, a dedicated health coach and medical provider, and a personalized treatment plan, all built around your data.
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The process
1
Start your assessment
Complete your 45-min intake assessment
2
Get your labs drawn
4,000 partnered lab locations nationwide
3
Review with your coach
Screen-by-screen lab review
4
Receive your protocol
Treatment delivered to your door
Why Marek
The only program pairing you with a dedicated health coach and medical provider, built on precision diagnostics, with no subscription required.
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Meet our co-founder
Derek
Co-Founder · MPMD Podcast
"Over time, I found it incredibly difficult to get medical oversight for myself and my family that reflected the latest research, and that was preventative. That's why I started Marek Health."
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What we test
Every client's lab panel is hand-selected from 1,000+ available biomarkers, built around their specific goals.
Panel categories
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Treatments
700+ medical provider-prescribed therapies built from your labs. Browse by category or explore the full formulary.
L-Carnitine (Injectable)
Injectable vial (500mg/mL), Oral capsule (800mg Acetyl L-Carnitine)Available in all 50 statesMarketing purposes only. Actual medications, if prescribed, are dispensed by a licensed pharmacy.
longevity
L-Carnitine (Injectable)L-Carnitine (Injectable)
Amino acid derivative essential for mitochondrial fatty acid transport (beta-oxidation). Injectable form provides higher bioavailability than oral. Used for fat metabolism support, exercise performance, and cardiovascular health.
Essential for mitochondrial fat oxidation
Injectable bypasses poor oral bioavailability
Supports exercise recovery
May improve sperm parameters
No commitment · HSA/FSA eligibleNo commitment · HSA/FSA eligible
How it works
Mechanism of action
Shuttles long-chain fatty acids across the inner mitochondrial membrane via carnitine palmitoyltransferase (CPT) system for beta-oxidation. Also removes toxic acyl-CoA intermediates and supports mitochondrial membrane integrity.
The baseline panel.
Every Marek client receives this baseline panel before a provider review. Your provider may add additional biomarkers based on your health history, symptoms, and goals, pulling from 1,000+ available markers. See more biomarkers →
Hormone Profile
12 markers
Sex hormones
- Total TestosteroneLC/MS
- Free TestosteroneEquilibrium Dialysis
- Estradiol, Sensitive / UltrasensitiveLC/MS
- Sex Hormone Binding Globulin (SHBG)
- ProgesteroneLC/MSFemale panel
- Prolactin
- Luteinizing Hormone (LH)
- Follicle-Stimulating Hormone (FSH)
- hCG, Total, QuantitativeFemale panel, pre-menopause
Adrenals & neurosteroids
- Cortisol
- DHEA-S
Growth hormone / IGF-1
- Insulin-Like Growth Factor I (IGF-1)
Thyroid Status
3 markers
Thyroid hormones
- Thyroid Stimulating Hormone (TSH)
- Free T4
- Free T3
Heart Health
9 markers
Cardiovascular health
- Total Cholesterol
- HDL Cholesterol
- LDL Cholesterol
- LDL:HDL Ratio
- VLDL Cholesterol
- Triglycerides
- Apolipoprotein-B (ApoB)
- C-Reactive Protein, High Sensitivity (hsCRP)
- Lipoprotein(a) (Lp(a))
Metabolism
3 markers
Insulin sensitivity
- Blood Glucose
- Fasting Insulin
- HbA1c
Organ Function
26 markers
Liver & pancreas
- AST
- ALT
- Bilirubin, Total
- γ-Glutamyl Transferase (GGT)
Kidney function
- BUN
- Creatinine w/ eGFR
Comprehensive Metabolic Panel (CMP)
- Glucose
- Blood Urea Nitrogen (BUN)
- Creatinine
- eGFR
- BUN/Creatinine Ratio
- Sodium
- Potassium
- Chloride
- Carbon Dioxide, Total
- Calcium
- Protein, Total
- Albumin
- Globulin, Total
- Albumin/Globulin (A/G) Ratio
- Alkaline Phosphatase (ALP)
- AST
- ALT
Prostate health
- Prostate-Specific Antigen (PSA)Male panel
- Free PSAMale panel
- % Free PSAMale panel
Nutrient Status
31 markers
Vitamins & minerals
- Vitamin D, 25-OHD (25-Hydroxy)
- Magnesium, RBC
Iron status
- Iron
- Iron Saturation
- TIBC
- UIBC
- Ferritin
Complete Blood Count (CBC)
- White Blood Count (WBC)
- Red Blood Count (RBC)
- Hemoglobin (Hgb)
- Hematocrit (HCT)
- MCV
- MCH
- MCHC
- Red Cell Distribution Width (RDW)
- Platelets
- Neutrophils
- Neutrophils (Absolute)
- Lymphocytes
- Lymphocytes (Absolute)
- Neutrophil/Lymphocyte Ratio
- Monocytes
- Monocytes (Absolute)
- Eosinophils
- Eosinophils (Absolute)
- Basophils
- Basophils (Absolute)
- Immature Cells
- Immature Granulocytes
- Immature Granulocytes (Absolute)
- NRBC, w/ Reflex for Immature Cells
Clinical evidence
The research behind L-Carnitine (Injectable).
Safety profile
Monitoring & safety information.
Commonly reported side effects
- Injection site pain
- Nausea
- Body odor (fishy, trimethylamine)
- Diarrhea (oral)
Less common but serious risks
- TMAO production (gut bacterial conversion of oral carnitine, cardiovascular concern)
- Seizures in seizure-prone individuals (rare)
Generally not appropriate for
- Seizure disorder (relative)
- Known hypersensitivity
Typical monitoring
- Carnitine levels (free and total)
- Lipid panel
- Exercise capacity assessment
FAQ
Quick answers.
Amino acid derivative essential for mitochondrial fatty acid transport (beta-oxidation). Injectable form provides higher bioavailability than oral. Used for fat metabolism support, exercise performance, and cardiovascular health.
Essential for mitochondrial fat oxidation. Injectable bypasses poor oral bioavailability. Supports exercise recovery. May improve sperm parameters. Cardiovascular protective effects.
Common side effects include: injection site pain, nausea, body odor (fishy, trimethylamine), diarrhea (oral). Most side effects are dose-dependent and may resolve with continued use or dose adjustment.
Amino acid derivative essential for mitochondrial fatty acid transport (beta-oxidation). Injectable form provides higher bioavailability than oral. Used for fat metabolism support, exercise performance, and cardiovascular health.
Treatments are dependent on licensed clinical prescription. Client costs vary based on individual labs and panel in treatments and services.