L-Carnitine

What Is L-Carnitine in Skincare?

L-carnitine is a small, water-soluble nutrient the body makes from the amino acids lysine and methionine. Its job is to carry fatty acids into mitochondria, the energy centers of cells, where they are burned for fuel. In skincare, it is used mainly in mattifying products for oily and combination skin, because lab and clinical studies link it to lower oil output and a less shiny look.

EWG Skin Deep rating for L-Carnitine

Quick Facts

How L-Carnitine Works on the Skin

Burning fat inside oil-gland cells

Oil glands fill their cells with lipids, then release them onto the skin as sebum. The idea behind L-carnitine is simple: if more fatty acids are burned for energy inside those cells, fewer are left to become oil. Peirano and colleagues (2012) tested this at three levels. In a human sebaceous cell line, 0.5% and 1% L-carnitine increased fat burning (beta-oxidation) and decreased the lipid stored in the cells, in a dose-dependent way. In pig skin, radiolabeled L-carnitine applied on top reached the deeper skin layers. In a randomized, vehicle-controlled study in people, a 2% L-carnitine formula used for 3 weeks significantly lowered the sebum secretion rate compared with the vehicle.

Oil control and hydration together

In a 2023 single-blind clinical trial, Detudom and colleagues assigned 90 adults aged 18 to 40 with oily or combination skin to one of three creams, used twice daily for 4 weeks: 2% L-carnitine, 5% EGCG (a green tea antioxidant), or both. All three groups had significantly lower sebum levels than at the start, and skin moisture readings rose in every group. The combination cream outperformed L-carnitine alone, which suggests L-carnitine works best as part of a team rather than by itself. Water loss through the skin did not increase, so the oil reduction did not come at the cost of dryness.

What it does not do

Earlier versions of this page described L-carnitine as an amino acid that builds DNA, regenerates cells, and fades scars. Those claims are not supported, and L-carnitine is not one of the amino acids used to build proteins. Its verified cosmetic role is a more matte, less shiny look.

How to Use It and Formulating Notes

• Routine: use an L-carnitine serum, gel, or light lotion on clean skin morning and night, focusing on the T-zone. In the studies above, changes were measured within 2 to 4 weeks.
• Pair it with: niacinamide, zinc PCA, or green tea extract for oil control, and a humectant such as glycerin or hyaluronic acid so the skin stays comfortable.
• DIY formulating: dissolve L-carnitine powder in the water phase at 2%, the level used in the clinical studies. It is water-soluble and works well in gels, toners, and oil-free lotions. Weigh it quickly and close the jar, because it absorbs moisture from the air and clumps.
• Preservation and storage: use a broad-spectrum preservative in any water-based formula. Store the powder sealed, cool, and dry.

Who It Suits

L-carnitine suits oily and combination skin, shiny T-zones, and anyone who wants a matte finish without harsh, drying cleansers. Dry skin has little reason to use it. Sensitive skin: patch test on the inner arm for 24 hours first and start at the lowest rate your supplier recommends, using the product once a day before moving to twice daily. Mild, short-lived redness was the most common side effect reported in the 2023 trial.

Frequently Asked Questions

Does topical L-carnitine reduce oily skin?

In a study, 2% L-carnitine lowered the sebum secretion rate over 3 weeks compared with a plain cream, and a second study found lower sebum levels after 4 weeks. Expect a less shiny look, not a permanent change in skin type.

Is L-carnitine an amino acid?

It is made in the body from two amino acids, lysine and methionine, and is often grouped with them on ingredient lists. It is not one of the amino acids used to build proteins.

Does topical L-carnitine have side effects?

It is generally well tolerated. In the 2023 trial, the most common side effect was mild, short-lived redness, and water loss through the skin did not increase. Patch test first if your skin is reactive.

Can I use L-carnitine with niacinamide?

Yes. Both are water-soluble and target shine, and they are easy to combine in one serum or layer one after the other. Zinc PCA and green tea extract are other good partners.

Is L-carnitine used in body firming creams?

It sometimes appears in body contouring creams because of its role in fat metabolism. The studies on this page measured facial oil, not body shape, so we cannot say it changes the look of cellulite or body contours.

Does taking L-carnitine supplements help oily skin?

The studies on this page tested L-carnitine applied to the skin, not supplements. Ask your physician before starting any supplement.

Shop for Oily Skin

The serums previously listed in this collection have been retired. For shine control today, our 10% Niacinamide Serum pairs niacinamide with zinc PCA. Learn more about niacinamide, browse products for oily skin, read about related ingredients in our amino acids guide, and try the recipes in Natural Oily Skin Cleanser: 6 Homemade Face Wash Recipes.

Sources

• Peirano RI, Hamann T, Düsing HJ, Akhiani M, et al. Topically applied L-carnitine effectively reduces sebum secretion in human skin. J Cosmet Dermatol. 2012;11(1):30-36. PubMed 22360332
• Detudom P, Kamanamool N, Paichitrojjana A, Udompataikul P, Udompataikul M. Efficacy of anti-sebum moisturizing cream containing 2% L-carnitine and 5% epigallocatechin gallate in seborrhea: a randomized clinical trial. J Cosmet Dermatol. 2023. doi:10.1111/jocd.15816

These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.

About the Author
Written by Kari Thomas, cosmetic formulator and founder of Skin Perfection.