Best Fruits for Weight Loss Avocados rich in L carnitine that can metabolize fat cells. Blueberries contain soluble fiber to help you feel full for longer periods of time. Grapefruit L Carnitine food supplement molecule chemical structure Ball and stick reprentation. Atoms are shown as color coded: hydrogen Stock Photo Alamy What is L Carnitine? L Carnitine is a naturally occurring amino acid derivative that the human body can synthesize itself. It is mainly found in red meat and dairy products. [1] Core Benefits of NOW Supplements, L Carnitine 1,000 mg, Purest Form, Amino Acid, Fitness Support*, 50 Tablets $41.90 I BLOOM CONCEPT L carnitine in Dog Food Maev L Carnitine & Keto Diet: How This Powerful Combo Accelerates Fat Loss