8 Benefits of L-Carnitine That Will Surprise You

Supplementing with carnitine is super useful for athletes looking to get more energy from fat. That’s why it’s often called the “fat burner.”

Needed to produce and release energy, it’s stored in our body and quickly released as an energy source, making it a highly sought-after supplement to boost sports performance and improve both aerobic and anaerobic capacities.

1. A brain function ally

Many clinical studies have shown that taking acetyl L-carnitine daily helps counteract the decline in brain function linked to Alzheimer’s and other brain diseases.

At the same time, it has positive effects on overall brain function in healthy older adults who don’t have Alzheimer’s or other brain conditions.

In some cases, L-carnitine helps protect the brain from cellular damage. A study with alcoholics showed that consuming 2,000 mg of acetyl-L-carnitine daily for 90 days improved their brain functions in various areas.

However, more extensive research is needed to confirm the long-term effects of L-carnitine consumption on healthy people with intact brain function, free from brain diseases.

2. For treating peripheral arterial disease

Several studies have demonstrated the effectiveness of carnitine dietary supplements in treating cardiac ischemia (restricted blood flow to the heart) and peripheral arterial disease (mainly characterized by poor leg circulation, commonly known as intermittent claudication).

Intermittent claudication is caused by inadequate oxygenated blood supply to the legs, which leads to acetyl-carnitine buildup in the muscle. Patients with peripheral arterial disease who develop claudication struggle a lot to exercise and walk, even short distances and at a slow pace. Research has shown that carnitine improves skeletal muscle performance in the leg.

However, other studies raise concerns about its effects on the heart and circulation, which might occur from prolonged exposure to this substance.

3. L-Carnitine boosts male fertility

Carnitine content in seminal fluid is closely linked to sperm count and motility. This indicates that the substance we’re discussing is beneficial for treating male infertility.

This is likely due to both the increase in mitochondrial fatty acid oxidation, which relates to energy supply, and the reduction of cell death in the testes.

Still, evaluating carnitine’s potential benefits for treating male infertility requires more extensive and precise clinical studies.

4. For optimal immune system function

It’s a proven fact that L-carnitine supports the immune system’s optimal state by neutralizing pathogens. At the same time, it stimulates defense formation and blocks disease onset.

As if that weren’t enough, it acts as an antioxidant, preventing cell and tissue damage caused by free radicals.

5. L-Carnitine’s role in the aging process

When mitochondrial function decreases, aging speeds up. Carnitine levels in tissue decline with age, which reduces mitochondrial membrane integrity.

Previous studies in mice have shown that high-dose supplements of acetyl-L-carnitine and alpha-lipoic acid reduce mitochondrial breakdown. The treated mice moved more and showed improved memory performance.

That said, no similar studies exist in humans, although a meta-analysis of double-blind, placebo-controlled trials suggests that acetyl-L-carnitine supplements improve memory function and reduce mental decline in older adults with mild cognitive impairment and Alzheimer’s disease.

In those studies, subjects took 1,500 to 3,000 mg of acetyl L-carnitine daily for 3 to 12 months.

6. To improve type II diabetes

Insulin resistance plays a key role in type II diabetes development and is linked to altered fatty acid oxidation in muscle. This raises the question of whether mitochondrial dysfunction drives disease progression.

This is due to reduced fat content in muscle and possibly lower blood sugar levels, thanks to faster oxidation of fats inside cells.

A recent analysis showed that taking 3,000 mg of L-carnitine daily for a year significantly relieved neuropathic pain and markedly improved patients with early-stage type II diabetes.

It’s also been proven that L-carnitine reduces type II diabetes symptoms and associated risk factors.

Another key reason this substance helps fight diabetes is by increasing an enzyme called AMPK, which enhances the body’s ability to use carbohydrates.

7. To counteract HIV and AIDS effects

The human immunodeficiency virus (HIV) lowers lymphocyte counts, eventually causing acquired immunodeficiency syndrome (AIDS). In people with HIV, fat accumulates in some body areas and breaks down in others. Also, blood fat and insulin resistance increase, leading to lipodystrophy syndrome.

Although the mechanisms behind this condition aren’t fully understood and research results are mixed, both intravenous and oral carnitine supplementation seem to reduce lymphocyte death in HIV patients, easing neuropathy and improving blood lipid levels.

8. To improve kidney failure

People with kidney failure lose balance in various ways, such as reduced synthesis, increased kidney excretion, decreased food intake due to loss of appetite, and lower consumption of animal-based foods.

Many patients with ESRD, especially those on hemodialysis, suffer from a carnitine deficiency. Their carnitine levels are low in both blood and muscles, inevitably leading to anemia, muscle weakness, altered blood lipid levels, fatigue, and heart disease development.

Numerous studies indicate that high-dose (often injected) and long-term L-carnitine supplements improve some or several symptoms in hemodialysis patients. However, it’s worth noting that research involved a small number of patients and no double-blind studies are available.

What’s levocarnitine’s connection to other diseases?

Cancer patients undergoing chemotherapy or radiotherapy often experience fatigue, poor nutrition, and carnitine deficiency.

A clinical study found that carnitine supplements at a dose of 4,000 mg daily for a week reduced fatigue and balanced blood carnitine levels in chemotherapy patients.

A second study with terminal cancer patients treated with carnitine (at doses of 250-3,000 mg per day) showed improved mood and sleep quality, along with reduced fatigue.

In both studies, nearly all participants had carnitine deficiency before starting supplementation.

Now you know what L-carnitine can do for your health. The ball’s in your court!