Some food for thought... most folks trying to lose bodyfat just eat to damn much. A little empty stomach and being hungry during lower to moderate intensity cardio is a GOOD thing for you metabolically while trying to lose fat. Overthinking the idea of "losing muscle" is one of those silly theories propagated by the supplement industry.
If you're eating enough protein throughout the day, weight training regularly and intensely, and using anabolics and hgh, how much muscle do you think you can lose?? I've seen enough jacked AIDS patients to know that muscle wasting/losing muscle is kind of a silly theory... don't sweat the minutia. Take your hgh, always do your cardio, nevermind about supplementing with silly amino acids pre cardio, be comfortable being hungry, and just put in the time and effort. Bodyfat will come off...
just some thoughts to keep it simple and save your wallet a little..