I don't know what my naturopath would say about bittermelon in supplement form for other people. We have so many different kinds of fruits and vegetables from all over the world in Hawaii, so must of the time we can get those things fresh. He only said it might be good for me to cook more with bittermelon.
You can probably order the supplements online or you might be able to buy the seeds online and grow your own indoors if you have a green thumb. I am drying a few seeds from bittermelon to plant as soon as I get my tiny garden ready.