L-karnitin ierii
Researchers who gave L-carnitine to older patients with chronic obstructive pulmonary disease (COPD) alongside exercise testing found that exercise capacity improved in the eight men who completed the experiment

VIBE Fruit & Veggie Superfoods Liquid Multi (32 oz) Ingredients: Purified water, natural extracts and flavors [May contain: grape, pomegranate, decaffeinated green tea leaf extract, aronia (chokeberry), cranberry, carrot, blueberry, organic stevia leaf extract, oregano, elderberry, acerola, tomato, lime, lemon, apple, blackcurrant, hibiscus (flower), pumpkin, cherry, aloe vera gel, grape seed extract, wolfberry (gojiberry), orange, citrus bioflavonoids, blackberry, raspberry, strawberry, aai berry, organic berry flavor], natural sugars (beet and/or tapioca solids), glycerin (vegetable), magnesium (from magnesium citrate, -malate, -sulfate, -glycerophosphate, and/or -chloride), citric acid, malic acid, potassium (from potassium citrate, -chloride, -iodide, and/or -lactate), ascorbic acid, calcium (from calcium citrate, -malate, -chloride, and/or -glycerophos- phate), l-lysine, d-alpha tocopherol acetate (with mixed tocopherols), natural gums (xanthan, guar), l-proline, niacin (from nicotinic acid), zinc (from zinc sulfate, and/or -chloride), d-calcium pantothenate, l-carnitine fumarate, retinyl palmitate, sodium borate, glucosamine hydrochloride (vegetable), manganese (from manganous chloride, and/or -sulfate), cholecalciferol, pyridoxine hydrochloride, riboflavin phosphate, thiamine hydrochloride, copper (from copper sulfate, and/or -gluconate), d-ribose, folate (folic acid, L-5-methyltetrahydrofolate), chromium chloride, biotin, selenium (from sodium selenate, and/or -chloride), methylcobalamin, vanadyl sulfate, coenzyme q10 (ubiquinone)

From a recent report on NBC News in a report by Maggie Fox: Hazens team showed gut bacteria convert an amino acid called carnitine into TMAO
Toxicology 445, 152598