NEW
🔥 L-Carnitine
Cost per serving
$0.42
Avg·−43%
amino · 10 active deals
The best-value L-Carnitine right now is about $0.08 per dose — across 4 tracked products the median is $0.279/dose, so shopping on cost-per-dose can cut your cost several-fold. Every L-Carnitine deal here is ranked by cost per dose— what you actually pay per serving, not the sticker price — because forms and absorption differ, so the cheapest bottle isn’t always the cheapest dose.
Right now the best value across our full L-Carnitine catalog is at $0.08 per serving.
L-carnitine is an indispensable water-soluble molecule derived from amino acids that, through the "carnitine shuttle," helps transport long-chain fatty acids from the cytoplasm into the mitochondrial matrix for beta-oxidation and energy production; more than 95% of total body carnitine resides in skeletal muscle. Oral L-carnitine supplementation is primarily studied and used to treat carnitine deficiency, where early diagnosis and prompt supplementation has improved the prognosis in primary carnitine deficiency. The article notes that, by contrast, management with L-carnitine is controversial in fatty acid oxidation (FAO) disorders, reflecting more limited evidence for broader applications. Notably, even with supplementation, muscle carnitine levels rise only slightly (only up to 5% to 10% of controls) — per StatPearls (NCBI Bookshelf); not medical advice.
For carnitine deficiency, treatment described is lifelong oral L-carnitine at a high dose (100 to 200 mg/kg daily in 3 divided doses). The oral bioavailability of L-carnitine is reported as only 5% to 18%.
In non-vegetarians, dietary intake is the primary source of carnitine and accounts for almost three-fourths of total body stores; the main dietary sources are red meat, poultry, and dairy products, with bioavailability of dietary carnitine between 54% and 87%. In strict vegetarians, most of the carnitine (>90%) is produced endogenously.
Primary carnitine deficiency results from genetic mutations in the OCTN2 (SLC22A5) transporter gene, with low plasma free carnitine levels (< 5 μmol/L; normal 20–50 μmol/L). Manifestations range from asymptomatic to acute metabolic crises with nonketotic or hypoketotic hypoglycemia, lactic acidosis, hyperammonemia, cardiomyopathy, and myopathy. Secondary deficiency arises from medication effects, malnutrition, or renal dysfunction and generally presents with less severe symptoms than primary deficiency.
L-carnitine is described as a fairly safe medication, with few side effects; those associated with high doses include diarrhea and intestinal discomfort. Bacterial degradation of unabsorbed oral L-carnitine in the bowel produces trimethylamine, which has a peculiar fishy odor; these effects can be managed by reducing the dose or with a course of oral metronidazole — per StatPearls (NCBI Bookshelf).
Every L-Carnitine deal above is ranked by real cost per dose with no paid placement — see our and .
Independent third-party testing is a voluntary check of a product's identity, potency and contaminants by an outside lab. It's a quality signal, not a value or efficacy claim. Confirm any brand's current status on the official registries:
Testing status is self-reported by the brand or drawn from public certification and may change — always verify on the official registry before purchase.
According to this page, L-carnitine is described as the mainstay of treatment for primary carnitine deficiency, where lifelong supplementation is used to help prevent hypoglycemic episodes, improve myopathic symptoms, and prevent cardiac complications such as dilated cardiomyopathy; it is also used in secondary carnitine deficiency. The page notes early diagnosis and prompt supplementation has improved prognosis, while adding that its use in fatty acid oxidation disorders is described as controversial. — per StatPearls (NCBI Bookshelf); general information, not medical advice.
The page states a standard dose of 100 to 200 mg/kg daily given in 3 divided doses, with maintenance therapy titrated based on plasma carnitine levels and clinical response; it also notes oral is 5% to 18%. These figures describe clinical use in carnitine deficiency rather than a general recommended intake. — per StatPearls (NCBI Bookshelf); general information, not medical advice.
The page describes L-carnitine as a fairly safe medication, noting that a few side effects associated with high doses include diarrhea and intestinal discomfort, and that bacterial degradation can produce trimethylamine with a fishy odor. It adds these effects can be minimized by decreasing the dose or a 7 to 10-day course of oral metronidazole. — per StatPearls (NCBI Bookshelf); general information, not medical advice.
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.
The article does not detail drug interactions with supplemental L-carnitine itself, but notes that certain medications cause secondary carnitine deficiency by depleting carnitine stores, including valproic acid, cyclosporine, pivampicillin, and some anticancer drugs; it also notes that pregnancy is a metabolically challenging situation for women with primary carnitine deficiency — per StatPearls (NCBI Bookshelf).
Cost per serving
$0.42
Avg·−43%Cost per serving
$1.67
30 servings · ~30-day supply
Cost per serving
$0.85
Pricey60 servings · ~60-day supply
Cost per serving
$0.91
Pricey60 servings · ~60-day supply
Cost per serving
$1.00
Pricey60 servings · ~60-day supply
Cost per serving
$0.90
Pricey60 servings · ~60-day supply
Cost per serving
$1.21
Pricey33 servings · ~33-day supply
Cost per serving
$1.77
Pricey31 servings · ~31-day supply
Cost per serving
$0.08
Cheap·−83%240 servings · ~240-day supply
Cost per serving
$0.14
Avg·−73%200 servings · ~200-day supply
SuperSmart USA LLC · SuperSmart · 🔥 L-Carnitine
CPS
Price
$42.00
Transparent Labs · Amazon.com · 💪 Beta-Alanine
CPS
Price
$49.99
Amazon.com · 🔥 L-Carnitine
CPS
Price
$50.95
Amazon.com · 🔥 L-Carnitine
CPS
Price
$54.78
Amazon.com · 🔥 L-Carnitine
CPS
Price
$59.95
Amazon.com · 🔥 L-Carnitine
CPS
Price
$54.19
Amazon.com · 🔥 L-Carnitine
CPS
Price
$39.95
Amazon.com · 🔥 L-Carnitine
CPS
Price
$54.99
Nutricost · Amazon.com · 🔥 L-Carnitine
CPS
Price
$19.95
NOW Foods · Amazon.com · 🔥 L-Carnitine
CPS
Price
$27.75
The page indicates monitoring may include plasma carnitine levels, echocardiogram, electrocardiogram, serum creatine kinase, serum transaminases, and blood sugar levels. It also notes that hypoglycemic episodes and sudden cardiac death have been reported in patients with poor compliance with L-carnitine therapy. — per StatPearls (NCBI Bookshelf); general information, not medical advice.
The page states that adult females planning to become pregnant should be informed that pregnancy is a metabolically challenging situation that needs to be evaluated and managed with both a metabolic and genetic specialist. It does not list specific contraindications beyond this guidance. — per StatPearls (NCBI Bookshelf); general information, not medical advice.
Nutricost L-Carnitine Tartrate 1 at $0.08 per serving — the lowest cost-per-dose l-carnitine in our catalog. See the full ranking on the Best L-Carnitine page.
We're tracking 10 active L-Carnitine deals across Amazon US and partner retailers, ranked by community votes and cost-per-dose — not paid placement.
Across 4 tracked L-Carnitine deals the median cost-per-dose is $0.279; the cheapest quartile comes in under $0.125 per serving. Anything below the median is a solid deal for the same molecule.
Deals are submitted by the community and ranked by net votes (hot minus cold) plus cost-per-dose normalised across container sizes. We take no affiliate kickbacks for ordering; sponsored slots, when present, are clearly badged.
L-carnitine is described as a fairly safe medication, with few side effects; those associated with high doses include diarrhea and intestinal discomfort. Bacterial degradation of unabsorbed oral L-carnitine in the bowel produces trimethylamine, which has a peculiar fishy odor; these effects can be managed by reducing the dose or with a course of oral metronidazole — per StatPearls (NCBI Bookshelf).
Primary carnitine deficiency results from genetic mutations in the OCTN2 (SLC22A5) transporter gene, with low plasma free carnitine levels (< 5 μmol/L; normal 20–50 μmol/L). Manifestations range from asymptomatic to acute metabolic crises with nonketotic or hypoketotic hypoglycemia, lactic acidosis, hyperammonemia, cardiomyopathy, and myopathy. Secondary deficiency arises from medication effects, malnutrition, or renal dysfunction and generally presents with less severe symptoms than primary deficiency.
In non-vegetarians, dietary intake is the primary source of carnitine and accounts for almost three-fourths of total body stores; the main dietary sources are red meat, poultry, and dairy products, with bioavailability of dietary carnitine between 54% and 87%. In strict vegetarians, most of the carnitine (>90%) is produced endogenously.
The article does not detail drug interactions with supplemental L-carnitine itself, but notes that certain medications cause secondary carnitine deficiency by depleting carnitine stores, including valproic acid, cyclosporine, pivampicillin, and some anticancer drugs; it also notes that pregnancy is a metabolically challenging situation for women with primary carnitine deficiency — per StatPearls (NCBI Bookshelf).
Dosage, upper-limit, deficiency, food-source and interaction facts are sourced from the NIH Office of Dietary Supplements L-Carnitine fact sheet. General information, not medical advice.
100 servings · ~100-day supply
