L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link ORAL VS. INJECTABLE L CARNITINE , Does it really matter which you use? , Both have pros and cons but it really comes down to what is going to be most suited to use as an individual athlete., Amazon.com: Liquid L Carnitine 3000 Plus Advanced 4 in 1 Formula with Acetyl L Carnitine, L Tartrate, ProGBB & Vitamin B, Stimulant Free High Absorption L Carnitine Supplement for Energy & Metabolism, 16oz : Health & Household Effect of Acute and Chronic Oral l Carnitine Supplementation on Exercise Performance Based on the Exercise Intensity: A Systematic Review