This is a method to create a Vegetable Glycerin tincture that has extracted the most actives out of your herb, but has no remaining Pure Grain Alcohol in it. Glycerin is somewhat between PGA and water in it's solvent ability, but we can work around that. There are some herbs which are most effectively extracted by PGA, but often it is undesirable in some patients i.e. an individual who abstains from alcohol wanting to heal and nourish the liver with Milk Thistle, children, or people who choose to abstain for religious or personal reasons. This can be overcome by using the PGA at full strength to create a tincture as normal, but then exchanging the PGA for glycerin. Make a tincture with an exactly measured & noted amount of PGA & herb via chosen method. strain. measure & note final amount. mix this strained tincture with an amount of VG equal to the amount of PGA you used to create the tincture. gently heat to evaporate alcohol off, eventually reaching the original finished volume of the original tincture. keep the heat low, as glycerin will vaporize at 212 f. the alcohol has now evaporated away, leaving the actives in your VG tincture. cool and store in an amber glass bottle. Poorly paraphrased from James Green's book "The Herbal Medicine Maker's Handbook" good read if you are interested in this type of thing - not so much recipes, but methodology, dosing etc. I have not actually had the chance to use this method, but there seemed to be an interest so I thought i would share. If anybody gives it a try, please share your results!