From my personal experience, you can use FFF with clen and Yohimbine, only thing you need to watch is hydration levels. Clen i feel is better cycled in a 3 week on 2 weeks off cycle IF you are going up with your dosing, i know that most people feel that 2 weeks is maximum, but if you are increasing dosing week on week, eg : 40mcg week 1, 80mcg week 2, 120mcg week 3, you can still get fat burning results.
the reason i like to cycle clen 3 weeks on and 2 weeks off instead of 2 weeks on 2 weeks off is that you minimize water rebound coming off of the clen. each person has their personal preference with running clen, i know that guys like dave palumbo and matt porter run clen straight without coming off it but they increase the dosing every 2 weeks by 20mcg.
i have met people that have worked with dave and matt and have gotten up to 160mcg of clen over a contest prep/fat loss cycle, and most people will jump up and down saying that is way to high, but if you think about it, your receptors are down regulated, and you need to carry on upping the dose to get the same effect, now i am not saying that this is the correct way to do it, but that is how some of the contest prep coaches are running it.
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