[highschoolstudent123]

My capsule likely contains 2 compounds, both in powder form. 1 is an excipient (aka filler) which should be cellulose, the second is a medicine. Each capsule contains, approximately, 300mg filler versus 15mg of medicine.

What chemical test should I run to confirm the presence of the medicine in the capsule? I was thinking of running a 1H NMR with chloroform as the solvent, but can it still be done given that the filler is insoluble in chloroform? I am thinking about getting the lab to dissolve it in chloroform and analyse the filtrate. How advisable is this, and what better alternatives are there?

I am asking this because I am worried that I got a bunk drug. I bought it from a chinese supplier because they were selling it for cheap. Name is Xian Sonwu, not sure how great their reputation is, but I originally trusted them since I saw that multiple researchers (with papers published to prestigious journals like nature) have bought and used their chemicals.

[Borek]

There is no universal method, best approach typically depends on the identity of the active substance.