Taurine vs L-Carnitine for Cats: What Each One Does

Taurine vs l-carnitine for cats is a common question, because both appear on heart and energy supplements. They sound similar, yet they do very different jobs. One is essential for every cat. The other is something cats can make themselves.

This guide explains what each one does, where each comes from, when vets use them and how to choose between them, or whether you need either at all.

New to taurine? Start with our guide to taurine for cats.

Taurine vs L-Carnitine for Cats: The Short Answer

Taurine is essential for cats. In other words, cats cannot make enough of it, so it must come from food. By contrast, cats make their own L-carnitine from two amino acids, lysine and methionine.

So in the taurine vs l-carnitine for cats question, taurine is the one every diet must supply. Carnitine is mainly a targeted extra, used for specific goals such as weight loss under a vet's care.

What Taurine Does in Cats

Taurine is an amino acid found in animal tissue. In fact, Merck notes that plant protein contains none. Also, VCA Animal Hospitals explains that cats need it for vision, heart muscle function and digestion.

• Heart: helps heart muscle contract with steady strength.
• Eyes: protects light-sensing cells in the retina.
• Digestion: cats use taurine to make bile acids.
• Reproduction: supports healthy pregnancy and kitten growth.

Moreover, low taurine causes serious disease. For example, the landmark 1987 Pion study linked heart failure in cats to low blood taurine. Also, the Companion Animals Extension says retinal changes may appear 5 to 6 months into a deficiency.

What L-Carnitine Does in Cats

On the other side of taurine vs l-carnitine for cats, L-carnitine carries fatty acids into the energy centers of cells, where they are burned for fuel. As a result, it plays a role in energy use, especially in muscle and the heart.

Cats make carnitine in the liver and kidneys, so it is not essential. Therefore, healthy cats on a complete diet rarely run short. According to PetMD, vets may use carnitine supplements for specific conditions, such as certain heart problems or weight management.

• Energy: helps cells burn fat.
• Weight loss: studied as an aid during supervised dieting.
• Liver: sometimes used as supportive care in fatty liver disease.

Taurine vs L-Carnitine for Cats: Side by Side

Here is a quick side-by-side comparison.

In short, taurine vs l-carnitine for cats is not a contest between equals. Taurine is a must; carnitine is an optional, targeted tool.

Heart Health: Taurine vs L-Carnitine for Cats

Both nutrients are linked to heart muscle, which is why owners often confuse them. However, the evidence differs by species, and that shapes taurine vs l-carnitine for cats.

• In cats: dilated cardiomyopathy (DCM) is classically linked to low taurine, as Merck explains.
• In dogs: carnitine deficiency is linked to some cases of DCM in certain breeds.

Also, the most common heart disease in cats, hypertrophic cardiomyopathy (HCM), is not caused by either deficiency, according to the Cornell Feline Health Center. So for heart health, taurine vs l-carnitine for cats clearly favors steady taurine, while carnitine is used only when a vet sees a specific reason. Our guide to taurine for cat heart health covers this in depth.

Weight Loss: Where L-Carnitine Fits

Meanwhile, carnitine gets most attention for weight loss. For example, a study of overweight cats found that adding L-carnitine during supervised weight loss helped cats burn more fat and lose weight faster.

Still, carnitine is not a diet pill. Weight loss in cats needs a vet plan, because cats that stop eating can develop fatty liver disease. Therefore, follow these rules.

1. First, get a target weight from your vet.
2. Next, use a measured weight-loss food or portion plan.
3. Then add carnitine only if your vet recommends it.
4. Finally, weigh your cat every one to two weeks.

In this area, the taurine vs l-carnitine for cats answer flips: carnitine is the relevant tool, while taurine simply needs to stay covered.

Food Sources of Taurine and Carnitine

Both come from animal tissue. However, the richest sources differ, which matters for taurine vs l-carnitine for cats on homemade diets.

• Taurine: heart, dark meat, shellfish and fish, according to a UC Davis study.
• Carnitine: red meat such as beef and lamb.
• Plants: contain no taurine and very little carnitine.

Likewise, cooking matters too. For example, boiling lowers taurine in meat. As a result, homemade diets need a set taurine source added after cooking. Our guide to taurine foods for cats lists natural sources.

Can Cats Take Taurine and L-Carnitine Together?

Yes, the two can be given together when there is a reason. In fact, some weight-management and heart-support products combine them. Since they do different jobs, they do not compete.

However, "together" only makes sense with a plan. So ask your vet which one your cat needs, and at what amount. In short, the taurine vs l-carnitine for cats choice is often "taurine always, carnitine sometimes."

Taurine vs L-Carnitine for Cats: Which to Choose

Above all, use your cat's situation to decide.

• Homemade or raw diet: taurine, at the recipe amount.
• Vet concern about heart or eyes: taurine, after testing.
• Supervised weight loss: carnitine, if your vet recommends it.
• Healthy cat on complete food: usually neither.

VCA says a healthy cat eating a complete food for its life stage does not require taurine supplementation. Our guide to whether cats need taurine supplements has a full checklist.

Homemade Diets: Taurine vs L-Carnitine for Cats

Home cooks face this question most often. After all, recipes list both nutrients in supplement mixes. However, their roles in a recipe are different.

• Taurine: almost every vet-built recipe adds a set amount, because cooking and thawing cause losses.
• Carnitine: usually not needed, because cats make their own, and meat supplies some.
• Exceptions: your nutritionist may add carnitine for a weight-loss or heart plan.

So for homemade food, taurine vs l-carnitine for cats is rarely a real choice: taurine is required, while carnitine is optional. Our guides to taurine for homemade cat food and taurine per pound of cat food explain the mixing math.

Senior Cats: Taurine vs L-Carnitine for Cats

Older cats often lose muscle and eat less. As a result, owners look for supplements that support energy. Here, taurine vs l-carnitine for cats depends on the problem.

• Eating less: taurine intake can fall, so check the diet first.
• Losing muscle: protein intake and a vet exam matter more than any supplement.
• Overweight seniors: carnitine may help a supervised weight plan.

Therefore, start with a senior checkup. Our guide to taurine for senior cats covers appetite, dental pain and kidney disease.

Myths About Taurine vs L-Carnitine for Cats

• "They are the same thing." False. Taurine is an amino acid; carnitine is a fat carrier.
• "Carnitine prevents feline DCM." False. In cats, DCM is classically linked to low taurine.
• "More of both is always better." False. Use amounts your vet sets.
• "Every cat needs a heart supplement." False. Most cats on a complete food need neither.

Overall, clearing up these myths makes taurine vs l-carnitine for cats much easier to decide. Similarly, it helps you read supplement claims with a critical eye.

Label Checks for Either Supplement

Whichever side of taurine vs l-carnitine for cats you land on, read the label closely. For example, check these points.

1. Amount per serving in mg. You need it to follow your vet's plan.
2. Full ingredient list. Every added ingredient should be named.
3. Serving guide by weight. Doses depend on body size.
4. Measuring tool. A scoop is easier than a kitchen spoon.

VCA warns that supplement quality may vary significantly among makers. Likewise, the AVMA reports that the main US dietary supplement law does not apply to animal products.

Kittysum Taurine is a daily taurine powder in a 200 g tub with a measuring scoop, blended with chicken liver for a meaty smell. You can read the label and serving guide here. For amounts, see our guide to taurine dosage for cats.

A Simple Routine If Your Vet Advises Both

Some cats end up on both supplements, for example during a supervised weight plan. In that case, a steady routine keeps things simple and avoids missed doses.

1. First, write down each amount your vet sets, in mg.
2. Next, mix both into one small portion of wet food at the same meal.
3. Then serve that portion first, before the rest of the meal.
4. After that, weigh your cat every one to two weeks.
5. Finally, bring the log to each recheck.

As a result, your vet can see whether the plan works. Also, the log shows quickly if your cat starts refusing the mixed portion. In short, taurine vs l-carnitine for cats becomes "both, measured" only with a clear plan and regular weigh-ins. Our guide to taurine for picky cats shares mixing tips for fussy eaters.

Kittens and Pregnant Cats

Growing kittens and pregnant queens need taurine from a complete growth food. By contrast, carnitine supplements are rarely used at these stages. Therefore, the taurine vs l-carnitine for cats question has a clear answer here: focus on a complete diet that covers taurine. Our guides to taurine for kittens and taurine for pregnant cats explain the details.

Safety of Taurine and L-Carnitine

VCA describes taurine supplementation as relatively safe, with no reports of problems from excess dietary taurine in cats. Even so, AAFCO sets no maximum, so use the label or your vet's amount.

Similarly, carnitine is also generally well tolerated, though PetMD notes that stomach upset can occur. Therefore, start either supplement slowly, mixed into wet food, and watch your cat for a few days. Our guide to whether taurine is safe for cats covers taurine safety in detail.

Common Mistakes With Taurine vs L-Carnitine for Cats

• Using carnitine instead of taurine. It cannot replace an essential nutrient.
• Treating heart disease at home. Get a diagnosis first.
• Crash dieting with carnitine. Rapid weight loss is dangerous for cats.
• Adding both without a reason. Ask your vet what your cat needs.
• Guessing amounts. Use the label or your vet's numbers.

Avoiding these mistakes keeps the taurine vs l-carnitine for cats decision simple.

Questions to Ask Your Vet About Taurine vs L-Carnitine for Cats

• Does my cat's diet already cover taurine?
• Would carnitine help my cat's weight plan?
• Should we test the heart or blood taurine?
• How much of each, and for how long?

Bring any product labels to the visit, so your vet can review taurine vs l-carnitine for cats in one look. For context, a 1991 Waltham study found cats need at least 39 mg of taurine per kg of body weight a day on canned food.

Also, a 2015 study found three of seven vegetarian canned diets below the AAFCO taurine minimum, and the 1978 study first showed that taurine is essential for cats. Finally, see the WSAVA guide for diet advice, and note that the VCA supplement guide says the FDA does not review non-drug supplements before sale.

Related guides: Taurine vs lysine for cats · Taurine benefits for cats · Best taurine supplement for cats · L-carnitine for cats

More taurine guides: Taurine for overweight cats

Key Terms Explained

• Taurine: an amino acid cats cannot make in sufficient amounts, so it must come from food.
• L-carnitine: a compound that carries fats into cells to be burned for energy; cats can make it.
• Essential nutrient: a nutrient the body cannot make enough of, so the diet must supply it.
• DCM: dilated cardiomyopathy, a weak and enlarged heart muscle.
• Hepatic lipidosis: fatty liver disease, a serious illness in cats that stop eating.

This article is for general education and is not veterinary advice. These statements have not been evaluated by the Food and Drug Administration. Kittysum products are not intended to diagnose, treat, cure or prevent any disease.