L-carnitine is a natural amino acid that helps the body turn fat into energy. If you eat a balanced diet, your body should be able to produce all the L-carnitine you need. Some medical conditions, like angina, can cause the body to produce too little L-carnitine. Some people can produce enough, but aren't able to use it properly, so supplementation might be needed. If you're planning on taking L-carnitine, talk to your doctor first.
Enhances Endurance
Results are mixed and opinions are divided when it comes to the use of L-carnitine for endurance. According to Vanderbilt University, some athletes seem to respond to the use of L-carnitine by gaining endurance, while others might find the supplement ineffective. This is partly based on whether they had L-carnitine deficiencies before they took the supplements. L-carnitine is also promoted as a supplement that enhances fat metabolism, which results in fat being burned as an energy source. Research shows conflicting results on whether this is true or not.
Boosts Brain Function
Deficiencies of L-carnitine can lead to premature aging of the brain, dementia, impaired cognition and other age-related disorders. According to Natural News, L-carnitine might also work to protect your brain against the deterioration and slow down that comes naturally as you age. In her book "Prescription for Dietary Wellness," health author Phyllis Balch points out that L-carnitine can be a valuable asset to those battling Alzheimer's and dementia.
May Protect the Heart
According to certified clinical nutritionist Byron Richards, L-carnitine can help prevent or reduce the damage caused by free radicals in the body. This, in turn, keeps your arteries young, protecting your heart and lowering your chances of developing high blood pressure and hardening of the arteries.
Safe for Healthy People
Vanderbilt University points out that L-carnitine is quite safe and most people should be able to take it without any risks. While there's no proof that the supplement actually does anything, people in good health can try it. If you have a medical condition or take any medications, talk to your doctor before taking any supplements. According to Natural News, you should stick to no more than 2 g of L-carnitine a day for up to 90 days in a row. Take a break of at least a week before you start again.
References
- Vanderbilt University: Benefits of L- Carnitine
- Natural News: How Acetyl-L-Carnitine Prevents Alzheimer's Disease and Dementia While Boosting Brain Function
- Wellness Resources: Acetyl-l-Carnitine Protects Heart and Arteries
- "Prescription for Dietary Wellness"; Phyllis A. Balch and Avery Trade; 2003
- University of Maryland Medical Center: Carnitine



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