Hello, Charlie and Marcus.
European brands surely aren't available in Taiwan or USA. Herbalist stores sells it here.
Capsules or liquid? Every apitherapist may have his preference. I know two doctors+apitherapist from Argentina wich recommend propolis in alcohol (alcoholic propolis?).
Usual propolis percentage over alcohol is 25%. On the Net I saw someone selling propolis 50% and 65% in the USA (http://www.beehivebotanicals.com/bee-propolis.html), but here these percentages aren't known.
Liquid propolis must be drunk dilued on 1/2 water glass.
You must ask to herbalist. Or also you can ask it to one apitherapist. Via pm I'll send the e-mail of Moises Asis, in Miami.
Pello.