Oxyshred + Carnitine Combo Stack smart, shred hard. OxyShred + Acetyl L Carnitine = your ultimate fat burning duo Boost energy, fire up your metabolism, and elevate your mood. I get asked so many questions about my pre workout combo, so here it is! I take Oxyshred + Acetyl L Carnitine. This combo gives me the energy I need to crush my workouts I get asked so many questions about my pre workout combo, so here it is! I take Oxyshred + Acetyl L Carnitine. This combo gives me the energy I need to crush my workouts