Yeah ur right, protein powder not worth it anyway, i buy kg's at a time so postage sucks. The other supps that ur not sure will get in, send an email to customs with the ingredient list and say that ur not sure whether it is allowed to come in, or go to a sports supplement store and ask if they can get it in. IF they cant then the supp will get seized.
Iv been gettiing stuff from america for over a year and half, and in that time iv saved thousands of dollars. My last shipment with about 6 supps including shipping, saved me over $300, if i had to get the stuff here.
Never had anything seized.