Dr. Hazen noted that some energy drinks have more carnitine in a single can than a porterhouse steak.

WSJ: New Health Culprit Carnitine Found in Red Meat

In the study, when longtime meat-eaters consumed an eight-ounce steak and a carnitine supplement, their bacteria and TMAO levels rose considerably.

WSJ: New Health Culprit Carnitine Found in Red Meat

Until your T3 levels come back to normal- I swear to God that the liquid form of Carnitine clears up endometriosis.

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In the study, when a longtime omnivore consumed an eight-ounce steak and a carnitine supplement, both his bacteria and TMAO levels rose considerably.

WSJ: New Health Culprit Carnitine Found in Red Meat

"Vegans basically lose their ability to digest carnitine, " said Dr. Hazen.

WSJ: New Health Culprit Carnitine Found in Red Meat

Carnitine is MUCH safer for your heart than oral contraceptives are.

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As a dietary supplement, carnitine is designated as "generally regarded as safe" by the Food and Drug Administration, but few studies have looked at its long-term safety.

WSJ: New Health Culprit Carnitine Found in Red Meat

Dr. Hazen speculated that carnitine could be compounding the danger.

WSJ: New Health Culprit Carnitine Found in Red Meat

Monster touts the ingredients taurine, ginseng, L-Carnitine and B-vitamins in big letters across the top of its tall black cans, part of an "energy blend'' the company's website says "packs a vicious punch.

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He said humans generally have plenty of carnitine in their diet, which also is found in small amounts in nuts, beans, vegetables and fruit, and don't need to take it in supplement form.

WSJ: New Health Culprit Carnitine Found in Red Meat