This is my first time attempting to make a glycerin-based tincture. I am making this to use as a pain reliever as I suffer with Fibro, RA, OA, DDD, Chronic Pain and Sciatica. I did quite a bit of research on glycerin and what kind to use and then went to talk to a pharmacist. Any glycerin that is labeled as "glycerin USP" is completely food grade. I found mine at WalMart here in Canada. The cost was less than $5 for 100ml, although I did see bigger bottles available at Shoppers Drug Mart for just under $3. I'm only wanting to start out making a small batch as I don't want to waste a lot of bud on something that may or may not actually turn out. Then I must have looked up hundreds of different recipes and what I got out of most is that they say a good ratio of bud to glycerin is 1g of bud to 1oz of glycerin. This is the ratio I am going to try. I am using the slow cooker method, which takes 24 hours. You combine together bud and glycerin in a mason jar, place the mason jar (with lid on) in the slow cooker and then add water to the slow cooker until it comes to the same level as the top of your mixture in the jar. Turn the slow on low and leave for 24 hours, making sure you stir at least 4 times through the process. I am going to start this at some point today so it will be done and ready to strain tomorrow. I will post updates along with photos if I can as I making it. Once the tincture is completely cooled and I've had a chance to try it I will also post to let you know how I think it worked out. Give me 2 days and I should be able to post my results. I hope this helps someone.