SB, Glycerin is also called glycerol. It is a colourless sweet viscous liquid derived from vegetable fats. It can be used in tinctures that are made with ACV instead of alcohol. Its awesome for tinctures that you will be giving to a child or a pet. I was giving my doggie B&B alcohol tincture and she was not all that pleased. I switched to Christopher's glycerol version and things got easier. A bit anyway.....