in my opinion, stimulates and over stimulant use is not effective for fat burning in regards to the risk/reward factor.. too much negative risk for the slight fat burning effects you get from them.
more effective strategy .. timing plays a role.
500mcg of HGH frag or 2iu HGH taken upon waking.
3iu insulin (advanced users only)
5mg Yohimbe
20mcg Clen
30 mins after taking that, then you do 40 minutes of steady state fasted cardio.. do that 4-7 days a week depending on where your at.
keep yourself in a calorie deficit .
then running some
Var/Winny
Primo
Tren
and some extra Clen
when in that calorie deficit , your going to have extremely positive nutrient partitioning and get extremely lean .. without all the stimulants.
the winny will directly blunt cortisol , which means you won't be able to store body fat and you won't break down muscle tissue and gluconeogenisis will be hindered.
the Var is an anabolic and will up regulate creatine phosphate and help you your burn fuel for energy and ATP production.
Primo will help you hold onto a ton of muscle while in a calorie deficit and enhance protein synthesis and nitrogen retention.
the Tren, well um yeah .. that simply makes you a god

the high androgen load of Tren will transform you cosmetically and when in a calorie deficit it does help you get lean.
the Clen is a direct fat burner, but also has minor stimulant effects while at the same time having minor anabolic effects..
want to add some more and still not rely on stimulants..
add in injectible SR9009 , and/or Cardarine..
both are PPAR agonist and not stimulants that will help mobilize the use of fatty acids and thus help you get leaner and be more efficient at exercise (I,e, more efficient at burning fuel for energy)
many better ways to go lean simply rely on a bunch of stimulants