dazed1,
I buy my bulk powders from purebulk.com, bulksupplements.com, holisherb.com and canadianprotein.com.
purebulk.com sells herbal extracts and nutritional supplements and the service is excellent. They actually answer the phone when you call and are knowledgeable about the products. Their site always states the minimum active ingredients of their extracts, unlike bulksupplements. They used to have more info on their site but the FDA made them take it down.
bulksupplements.com has an even larger variety of products than purebulk.com but the service is poor. The prices are cheaper though and they have a wider selection of products, especially the herbal extracts. One of the best features of their site is the extensive reviews done by what appear to be real customers. You can learn a lot just from reading the reviews.
holisherb.com stands for Holistic Herbal Solutions Inc. and seems to be a supplier for professional herbalists. Although they have some nutritional supplements, most of what they carry are whole herbs, either cut and sifted (like for making tea) or ground into a powder. Customer service is not that great.
I'm in Toronto Canada and there is a place called canadianprotein.com that sells Creapure Creatine, Beta-Alanine, L-glutamine and a few other products dirt cheap and includes free shipping if you buy at least $100 CAD but that's for Canadian delivery. If you're in the States you can probably do better. Customer service is poor. Forget about someone answering the phone.
A few months ago I bought a couple of capsule machines, the round 100 and square 400 for size 000 capsules, from a company in China named CapsulCN. You can see their machines being used on youtube.com. I chose the largest capsule to reduce the number of capsules I needed make. I've gone through 50,000 capsules in the last couple of months though I have built up a large supply of encapsulated substances. I just had a bad experience with a delivery that may have been due to UPS and the Christmas rush but you pay via Paypal so are somewhat protected. My 3 other orders came through fine and the machines are impressive. It takes a while to get good at it though. CapsulCN is the only company that sells separated size 000 capsules in less than 500,000 lots so if you didn't want to deal with them anymore you'd be out of luck. You can get smaller injection molded machines (100 capsules per batch) for size 00 or size 0 capsules at amazon.com a lot cheaper and see if you like it and get separated capsules in those sizes from Capsuline or other companies. I have one in size 0 but haven't used it yet.
If you get your own capsule machines though you can encapsulate anything. Herbs, nutritional supplements and foods and spices like Spirulina, Broken Cell Chlorella, Ginger, Cayenne and all these mushroom extracts that are popular right now.
I "compound" my own mixtures using a kitchen scale and mixing container and use turmeric and cinnamon and other inert substances as compounding agents (filler). I actually need to go talk to a compounding pharmacy for any tricks of their trade. The size 000 capsule fits approximately 1000 mg of an average density ingredient but can actually end up weighing 600 mg to 1400 mg depending on the substance. I'm actually on this site searching for this type of info now and am surprised how many hard core experimenters are buying supplements in the form of encapsulated products from brand names. That's incredibly expensive when you compare it to bulk, although in fairness, buying in bulk gets far cheaper in the larger quantities. For many products 1 kg costs only about twice as much as 250 grams, but if you start compounding that, you're going to wind up with more product than you can use in the year it takes for the potency to start declining.
bunsw