Best Acetyl L-Carnitine Supplements

Top Acetyl L-Carnitine Products Compared

Double Wood Supplements Acetyl L-Carnitine


  • SUPPORTS EXERCISE ENDURANCE AND STAMINA – ALCAR supplementation supports improved endurance and stamina during resistance training.
  • SUPPORTS COGNITIVE FUNCTION AND ATTENTION – ALCAR supports healthy cognitive function and promotes focus and attention.
  • MADE IN THE USA – Our Acetyl L-Carnitine is manufactured right here in the USA at a cGMP certified facility.


Acetyl L-Carnitine (ALCAR) is an acetylated form of L-Carnitine which is similar to typical L-Carnitine but is able to cross the blood-brain barrier. L-Carnitine is a compound naturally produced by the body which plays a key role in the mitochondrial oxidation of long-chain fatty acids.

When taken as a supplement, ALCAR supports exercise endurance and stamina, particularly for resistance training. Since ALCAR can cross the blood brain barrier, unlike the non-acetylated L-Carnitine it supports cognitive function and attention.

Recommended Dosage

As a supplement for exercise endurance or cognitive support, take 2-4 capsules (1000 mg – 2000 mg) per day on an empty stomach. It’s not recommended to take over 6 capsules (3000 mg) per day due to increased risk of side effects.

NOW Foods Acetyl L-Carnitine

You Save:$2.73 (9%)

NOW Foods Acetyl-L-Carnitine is a vegan pill that’s free from a number of allergens and manufactured in a Good Manufacturing Practices (GMP) certified facility. It has rave customer reviews, pushing it toward the top of the list.


  • 1000mg Acetyl-L-Carnitine
  • 2 capsules per serving
  • 100 servings per container
  • Vegan/vegetarian
  • GMP certified manufacturing facility
  • Free from gluten, yeast, wheat, soy, milk, egg, etc.
  • Amazon’s choice
  • Good customer reviews

Who Makes It?

NOW Foods has been a leading natural supplement producer since its founding in 1968. The company offers hundreds of natural health products.

Bottom Line

NOW Acetyl L-Carnitine is a popular product and one of the best carnitine supplements on the market. It contains 500mg of Acetyl L-Carnitine per capsule, and there are 200 capsules in each bottle. The product is endorsed as Amazon’s choice.

Doctor’s Best Acetyl-L-Carnitine


Doctor’s Best Acetyl-L-Carnitine is a vegan, non-GMO and gluten-free Acetyl-L-Carnitine pill. It is well-reviewed by customers and offers a good Acetyl-L-Carnitine dosage.


  • 1000mg Acetyl-L-Carnitine
  • 2 capsules per serving
  • 60 servings per container
  • Vegan
  • Non-GMO and gluten-free
  • Good customer reviews

Who Makes It?

Doctor’s Best Vitamins is a supplement brand that was founded by a physician in 1990. It uses mostly well-researched, branded ingredients in its over 200 products.

Bottom Line

This is one of the top Acetyl-L-Carnitine supplements on the market, offering a vegan, gluten-free and non-GMO pill. It has good customer reviews and provides 1000mg per serving of Acetyl-L-Carnitine.

BulkSupplements Pure Acetyl L-Carnitine

Price: $17.96

BulkSupplements Pure Acetyl L-Carnitine is an affordable, bulk package of Acetyl-L-Carnitine powder. It is pure Acetyl L-Carnitine, free from fillers and preservatives. It’s also one of the most affordable products on the market.


  • 500 Acetyl L-Carnitinemg
  • 200 servings per bag
  • Great customer reviews
  • Affordable
  • Bulk quantity

Who Makes It?

BulkSupplements is a supplement supplier and producer that offers over 400 nutritional supplement ingredients to consumers and manufacturers. Their products are available in bulk quantities for affordable prices.

Bottom Line

This Acetyl L-Carnitine powder comes in an affordable, bulk quantity providing a pure Acetyl L-Carnitine powder. The suggested dosage of 500mg per serving is a little more than ⅛ of a teaspoon. It is affordable and has great consumer reviews.

Frequently Asked Questions About Acetyl-L-Carnitine

What is Acetyl-L-Carnitine?

There is an amino acid found in most of the cells in your body and made by the liver and kidneys, called L-Carnitine, which helps the body produce energy. Animals produce this amino acid, too – which means you can consume it in some foods.

L-Carnitine is found in meats and fish, which is part of the reason for its name. The Latin word for “flesh” is “carnus.” The L-Carnitine consumed in foods helps supplement natural levels in the body. Vegans and people with particular genetic diseases are sometimes unable to produce enough L-Carnitine, so it is considered a conditionally essential nutrient.

Acetyl-L-Carnitine, otherwise known as ALCAR, is a form of L-Carnitine with a compound attached to it, called an acetyl group. It’s an amino acid derivative. The acetyl group that’s attached to the amino acid helps contribute to the production of a neurotransmitter called acetylcholine.

Neurotransmitters are often called the body’s chemical messengers because they help transmit messages between nerve cells. Acetylcholine, in particular, helps transmit messages between motor neurons, which control muscle contractions, and is required for mental function. It is found in the brain and throughout the nervous system. In the body, L-Carnitine is naturally converted into Acetyl-L-Carnitine.

Acetyl-L-Carnitine is available as a supplement and has been studied for its potential mental health and cognitive decline applications. Aging appears to correlate with L-Carnitine deficiency, and Acetyl-L-Carnitine supplements can help counter the deficiency, according to Examine.

There is pretty good evidence that Acetyl-L-Carnitine supplements can help delay age-related cognitive decline, and reduce symptoms of diabetic neuropathy, according to the University of Michigan. Some research shows Acetyl-L-Carnitine may help with conditions such as Alzheimer’s disease, depression, erectile dysfunction, and fibromyalgia, according to the university.

What Are the Benefits of Acetyl-L-Carnitine?

There are a number of uses identified for Acetyl-L-Carnitine, with most related to supporting cognitive functions. Some of these uses include:

  • Age-related cognitive decline: Acetyl-L-Carnitine supplements may help slow cognitive decline related to age, or help improve cognitive functions of the senile brain, according to research. One study found that short-term, intensive treatment with Acetyl-L-Carnitine supplements can improve the mental function of the senile brain without side effects. Another study found that supplementing with Acetyl-L-Carnitine can help with general cognition in the elderly.
  • Alzheimer’s disease: Alzheimer’s disease is a progressive, age-related condition that destroys important mental functions and memory. Some short-term studies show that Acetyl-L-Carnitine supplements can slow the progression of the disease, improve memory and enhance mental performance, according to the University of Michigan. One study has shown that Acetyl-L-Carnitine supplements may have a beneficial effect on short-term memory, while another study found it may slow overall deterioration in some cognitive areas. More research is needed.
  • Depression: One recent study showed the Acetyl-L-Carnitine can have the same effects as an antidepressant medication called fluoxetine on elderly patients with depression. Fluoxetine is a serotonin reuptake inhibitor, but the study suggests that Acetyl-L-Carnitine works through different mechanisms due to a difference in latency time of clinical response.
  • Erectile dysfunction: Erectile dysfunction is a very common condition that affects a man’s ability to have sex. Acetyl-L-Carnitine supplements may help with this condition. One study found that Acetyl-L-Carnitine combined with Propionyl-L-Carnitine safely and reliably improved sexual potency in men who had a particular surgical procedure that resulted in erectile dysfunction. More research is needed, however.
  • Diabetic neuropathy: Diabetic neuropathy is nerve damage that results from diabetes, and most often affects the legs and feet. One study concluded that Acetyl-L-Carnitine treatments are effective in alleviating symptoms, such as pain, and improves healing – specifically nerve fiber regeneration.

How Do I Take Acetyl-L-Carnitine?

Dosages of Acetyl-L-Carnitine range between 630 and 2,500mg, according to Examine. It is taken daily by mouth. No official dosage recommendation exists.

It’s best to follow manufacturer instructions and speak with your doctor for guidelines.

Are There Any Side Effects of Acetyl-L-Carnitine?

Acetyl-L-Carnitine supplements can cause side effects such as nausea, stomach upset, vomiting, dry mouth, etc. It may cause a fishy odor of breath, urine, and sweat. More serious side effects are possible but rare.

How Do I Pick a Good Acetyl-L-Carnitine Product?

The best Acetyl-L-Carnitine products are free from unnecessary fillers and additives, and provide value – high quality, at a reasonable price. Check the supplement label’s ingredients list for filler ingredients, artificial ingredients, and preservatives.

Good quality Acetyl-L-Carnitine products also provide a good dosage, with ideally at least 500mg per serving. And finally, trustworthy companies make the best products, so research the brand before buying.

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