Question what are common things cocaine and heroin are cut with?

[sey]

Hey im want to know what cocaine and heroin are usually cut with i know that cocaine is some times cut with caffeine but i do not know what heroin is cut with as im new to it and i want to maximize yield.

Thanks.

 

[miner21]

Herion can have fent if its really stepped on, or even when its not

 

[sey]

is there anything more available because i dont feel like trying to find someone who has fent or make it myself as its really uncommon where i am ive never even seen it here