Once it is heated to long, it begins to lose its sweetness. So anything thats really hot will probaly just make it taste non-sweet. This is what I have heard on other forums, but even though people say this, they still use it in recipes to bake things with so i dunno. I buy mine from Wilderness family naturals, their vegetable glycerin is from coconuts. I know the Now brand and frontier are from coconuts too, but alot of other companies use corn as thier source.