hi! I want to add a fat burning product to my OT cycle, which would be best to get most noticeable gains and little muscle loss?

I recommend you taking Clenbuterol. T-3 should be last resort.

Aside from its fat burning properties, Clen is often used as an anti-catabolic to maintain muscular gains following a steroid cycle. A dosage of 40mcg daily would be suited to this situation.

Just review your diet and cardio. Do not look for a magic pill, as there isnt one.