I looked into this stack when alot of people on here were talking about it and I must say, its pretty poor.
Synephrine:
This is an effective compound for fat loss, its basically ephedrine's slightly weaker cousin.
Synpherine is a great OTC supp for fat loss because it improves fat mobilization, meaning theres more fat available in the blood stream to be used for energy.
Yohimbe wont give you better results unless your already below 10%bf & trying to get rid of some stubborn fat area (bottom part of abs, etc). Yohimbe is very good at targeting these areas but if your above 10%bf it wont do anything thats worth mentioning.
ECGC:
This can be effective, but I don't really understand why you would use it instead of plain old caffeine.
There are studies showing that ECGC is thermogenic, but their is no real agreement on the correct dosing.
Also, no matter how effective it may be - caffeine has better synergy with synephrine.
Chromium:
IMO, this is a complete waste of money for fat loss.
The stuff about it improving insulin sensitivity mainly applies to individuals who are already insulin resistant/prediabetic.
Will it make a difference if your deficient? Sure, but so will Vit D, Zinc, and all the other vitamins & minerals in the presence of a deficiency.
Austinite clearly knows his stuff, he's helped alot of guys out on here.
However, I coach natural bb's for a living so I HAVE to know about any OTC supplements that may aid in fat loss.
Synephrine is great, replace the ECGC with plain caffeine and skip the chromium altogether.
Of course there are a few other supps that MAY be helpful, but I wont make this post longer than it needs to be