Injectable vs Oral L Carnitine: Which Works Better? AWP Injectable L carnitine vs oral? For me, absorption, fewer GI issues, & energy performance gains make injections the winner. #LCarnitine #Injectable #Bioavailability #MetabolicHealth #EnergyBoost L Carnitine Injectable vs Oral: Which Works Better for Canadians The effects of L carnitine supplementation on lipid profiles in adults: A systematic review and dose response meta analysis ScienceDirect