Vegetable glycerine is a slightly sweet, syrupy liquid made by heating vegetable fats under pressure or together with a strong alkali.
Vegetable glycerine has several uses. The most popular are cosmetics, pharmaceutical drugs and food products. Vegetable glycerine may act as a moisturizer, reduce skin irritation, protect against infection and boost wound healing. It may also help relieve constipation and promote hydration and physical performance. That said, more studies are needed.
Vegetable glycerine is generally considered safe. However, there is a possibility of allergic reaction, headaches, nausea, thirst and stomach upset in some people.