"L-Carnitine linked to Heart Disease”

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Nutrition experts recommend reducing intake of red meat in the diet because it is high in cholesterol and saturated fat, which promotes coronary artery disease. 
A Cleveland Clinic study led by Stanley Hazen found that carnitine, a popular athletic supplement and component of red meat, also triggers heart disease. 
Bacteria in the gut break down carnitine to trimethylamine-N-oxide (TMAO), which promotes arterial disease by increasing cholesterol deposits in the arteries.
 High TMAO in the blood was a good predictor of heart attack and stroke. 
A study by the same research group showed that gut microbes also metabolized phosphatidylcholine, another athletic supplement, to TMOA. 
Administration of antibiotics decreased TMOA levels. 
Carnitine is a popular athletic supplement. 
However, a joint position statement from the American Dietetic Association and the Dietitians of Canada concluded that carnitine does not improve athletic performance. 
It might also promote heart disease.