Meta Information
ID:l-carnitine
Name:
Schema Version:AIM-2.0
Interactions
Target id:
/class/anticoagulants-antiplatelets
Target name:
Anticoagulants and Antiplatelets (e.g., Warfarin)
Severity:
major
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
L-Carnitine may enhance the effects of anticoagulant drugs like warfarin and acenocoumarol, significantly increasing the international normalized ratio (INR) and the risk of bleeding.
Actionable advice:
Avoid L-Carnitine supplementation if you are taking anticoagulant medications unless approved and closely monitored by your physician.
Target id:
/intervention/levothyroxine_systemic_disease
Target name:
Thyroid Hormones (e.g., Levothyroxine)
Severity:
major
Interaction type:
diminishing
Nature:
absolute
Temporal spacing:
null
Description:
L-Carnitine can inhibit the transport of thyroid hormones (T3 and T4) into the cell nucleus, potentially reducing their effectiveness and worsening symptoms of hypothyroidism.
Actionable advice:
Avoid L-Carnitine if you have hypothyroidism or are taking thyroid medication, as it can interfere with treatment.
Target id:
/condition/renal-impairment
Target name:
Severe Renal Impairment / Dialysis
Severity:
major
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
The kidneys are responsible for clearing L-Carnitine and its metabolites. In severe kidney disease, these substances can accumulate to potentially toxic levels.
Actionable advice:
Do not take L-Carnitine if you have severe kidney disease, except under the direct supervision of a nephrologist.
Target id:
/class/antibiotics-long-term
Target name:
Pivalate-Conjugated Antibiotics
Severity:
major
Interaction type:
requirement
Nature:
absolute
Temporal spacing:
null
Description:
Certain antibiotics (e.g., pivampicillin) release pivalic acid, which binds to carnitine and is excreted, causing a rapid and severe depletion of the body's carnitine stores.
Actionable advice:
Consult a physician about L-carnitine supplementation if you are prescribed a pivalate-conjugated antibiotic to prevent deficiency.
Target id:
/condition/seizure-disorder
Target name:
Seizure Disorder / Epilepsy
Severity:
moderate
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
There have been some reports that L-Carnitine supplementation may increase the frequency or severity of seizures in individuals with a pre-existing seizure disorder.
Actionable advice:
Consult your neurologist before taking L-Carnitine if you have a history of seizures.
Target id:
/dietary/tmao-precursor-foods
Target name:
High-Choline Foods & Red Meat
Severity:
moderate
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
Gut bacteria can convert L-Carnitine and choline (high in red meat, eggs) into TMA, which the liver converts to TMAO. High TMAO is a biomarker associated with increased cardiovascular risk.
Actionable advice:
Consider monitoring TMAO levels if taking L-Carnitine, especially with a diet high in red meat and eggs.
Target id:
/class/anticonvulsants
Target name:
Certain Anticonvulsants (e.g., Valproic Acid)
Severity:
moderate
Interaction type:
requirement
Nature:
absolute
Temporal spacing:
null
Description:
Long-term use of certain anticonvulsants like valproic acid, phenobarbital, phenytoin, and carbamazepine can deplete carnitine stores, leading to a secondary deficiency.
Actionable advice:
Discuss carnitine level testing and potential supplementation with your doctor if taking these anticonvulsants long-term.
Target id:
/condition/pregnancy
Target name:
Pregnancy
Severity:
moderate
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
The safety of L-Carnitine supplementation during pregnancy has not been well-established. It should only be used if a deficiency is diagnosed and prescribed by a physician.
Actionable advice:
Avoid L-Carnitine supplementation during pregnancy unless medically advised.
Target id:
/condition/lactation
Target name:
Breastfeeding (Lactation)
Severity:
moderate
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
It is not known if supplemental L-Carnitine passes into breast milk in significant amounts or its effect on an infant. Avoid use unless medically advised.
Actionable advice:
Avoid L-Carnitine supplementation while breastfeeding unless medically advised.
Target id:
/biomarker/tmao
Target name:
Trimethylamine N-oxide (TMAO)
Severity:
moderate
Interaction type:
assay_interference
Nature:
absolute
Temporal spacing:
null
Description:
L-Carnitine supplementation is a direct precursor to TMAO production by the gut microbiome and can significantly elevate its levels in the blood, impacting test results.
Actionable advice:
Disclose L-Carnitine use to your physician when interpreting TMAO lab results for cardiovascular risk assessment.
Target id:
/intervention/exercise
Target name:
Exercise
Severity:
minor
Interaction type:
synergistic
Nature:
temporal
Temporal spacing:
Hours before target:
1
Hours after target:
null
Description:
L-Carnitine facilitates the transport of fatty acids into mitochondria for energy production, a process that is crucial during physical activity. Taking it before exercise may support fat metabolism.
Actionable advice:
For potential exercise benefits, take L-Carnitine about 30-60 minutes before your workout.
Target id:
/dietary/meal
Target name:
Any Meal
Severity:
minor
Interaction type:
synergistic
Nature:
temporal
Temporal spacing:
Hours before target:
0
Hours after target:
0
Description:
Taking L-Carnitine with a meal, particularly one containing some fats, may improve its absorption and align its availability with the metabolic processes it supports.
Actionable advice:
Take L-Carnitine with a meal to enhance absorption and minimize potential gastrointestinal upset.
Target id:
/intervention/coenzyme-q10
Target name:
Coenzyme Q10 (CoQ10)
Severity:
minor
Interaction type:
synergistic
Nature:
temporal
Temporal spacing:
Hours before target:
0
Hours after target:
0
Description:
Both L-Carnitine and CoQ10 are essential for mitochondrial energy production. Taking them together provides complementary support for cellular energy pathways.
Actionable advice:
Consider taking L-Carnitine and CoQ10 at the same time with a meal.
Target id:
/intervention/acetyl-l-carnitine
Target name:
Acetyl-L-Carnitine (ALCAR)
Severity:
minor
Interaction type:
diminishing
Nature:
temporal
Temporal spacing:
Hours before target:
2
Hours after target:
2
Description:
L-Carnitine and ALCAR are related compounds that may compete for the same transporters for absorption in the gut, potentially reducing the uptake of both if taken simultaneously.
Actionable advice:
If taking both forms of carnitine for different purposes, separate the doses by at least 2 hours.