Actually USP doesn't necessarily mean it's all vegetable glycerin. The Humco brand in US Walmarts is vegetable according to Humco. But not all USP glycerins are - some have animal glycerin which isn;t as good for vaping. Call the company that makes the UK brnad and ask them. You can also use the glycerine sold for cake-decorating applications - I think it is used in some kinds of icings? In the US Wilton is usually the brand and it's sold in the cake decorating section of Michael's craft stores.
Glyerin/glycerol whether the source is from animal or vegetable is the exact same chemical formula in the end. The animal/vegetable thing is only a personal concern having nothing to do with the quality or the actual make up of the product.
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