Head shops selling 28 grams of San Pedro Cactus/Ayahuasca, how to extract?

So a head shop near my area is selling those, but won't tell how to extract (of course). Is that even material to extract, and how would one do that? Also i think it's Ayahuasca bark they're selling, rather than root. help a brother out?

Ayahausca is very different from San Pedro. Find out exactly what it is and then go look it up on erowid. Then come here with any questions.