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Creatine supplementation effect on recovery following exercise-induced muscle damage: A systematic review and meta-analysis of randomized controlled trials

Comparative Biochemistry & Physiology B Comparative Biochemistry 99 , 687691 (1991)

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Acetyl-L-carnitine: 600-2500mg/day The best for brain health and function L-carnitine L-tartrate: 1000-4000mg/day The most effective for exercise performance If you plan to get the most from your workout then supplementing with L-carnitine [+ carbohydrate] one hour prior to exercise is the best idea

They also tended toward higher oxygen consumption

Glob Pediatr Health