Honestly I wouldn't do any of them if quick fat loss by natural means wasn't quick enough... In my case thank god it happens pretty fast with diet and cardio, but if u do prefer to use clen and ur pills are 40 mcg try 60mcg first and then up(that's just me cause. I'm really a pvssy for clen cause my heart tells me it's just not right) but if u are set in using something use clen only and I wouldn't use ketotifen... Just cycle it twoo weeks (I would think there is a reason why the body is downregulating) but that's also your choice...

Anyhow (I sound like a grandma so sorry aboutthat) good luck stay safe and cardio up

Cheers