Quick answer
L-carnitine is a nutrient your body makes from the amino acids lysine and methionine, and it's found mainly in red meat. Acetyl-L-carnitine (ALCAR) is L-carnitine with an acetyl group attached. They're different forms sold as separate supplements, so compare the form and amount per serve on the label.
ALCAR
Acetyl-L-carnitine
Made from
Lysine and methionine
Richest food source
Red meat
Name origin
Latin carnis, meaning flesh
What is carnitine?
Carnitine is a compound made in the body and also obtained from food. Its name comes from the Latin word for flesh, because it was first found in meat. Beef and lamb are the richest dietary sources, with smaller amounts in dairy and very little in plant foods.
Acetyl-L-carnitine vs L-carnitine at a glance
| L-carnitine | Acetyl-L-carnitine (ALCAR) | |
|---|---|---|
| Structure | Carnitine | Carnitine + acetyl group |
| Common forms | L-carnitine tartrate, base | ALCAR HCl |
| Common label amounts | 500–2000mg | 500–1000mg |
| MAYN product | – | Acetyl L-Carnitine 1000mg, 90 caps |
What does the acetyl group mean?
An acetyl group is a small two-carbon chemical group. Adding it to carnitine creates a distinct compound with its own name and properties. That's why ALCAR and L-carnitine are sold and labelled separately.
Who looks at carnitine supplements?
Because carnitine comes mostly from meat, people eating vegetarian or vegan diets often have lower dietary intakes. As always, follow the label directions and speak with a healthcare professional if you're unsure.
Tip: Look for the "L" form on the label: L-carnitine and acetyl-L-carnitine are the forms found in nature.
Frequently asked questions
Is ALCAR the same as L-carnitine?
No. ALCAR is acetyl-L-carnitine, a different form with an acetyl group attached.
Do vegans get carnitine from food?
Plant foods contain very little carnitine, although the body can make its own from lysine and methionine.
What does the L in L-carnitine mean?
It describes the orientation of the molecule. The L form is the one found in nature.
Keep reading
This article is general information only and is not medical advice. Always read the label and follow the directions for use. Dietary supplements should not replace a balanced diet. If you are pregnant, breastfeeding, taking medication or have a medical condition, speak with your doctor or pharmacist before taking a new supplement.
