The difference is that vegetable glycerin is made strictly from plant oils, whereas non-vegetable glycerin is made from animal and/or petroleum-based oils. Additionally, most vegetable glycerin you can get at health food stores is food-grade, so it's got a wider range of uses.
2c, fine/medium, low porosity, normal elasticity, protein-sensitive
Low-Poo:Chagrin Valley Cafe Moreno shampoo bar
RO: VO5 Blackberry Sage Tea
LI: Goth Rosary Daily Use Hair Conditioner/Humectant
Styling: L'Oreal Melting Gel, Nightblooming Triple Moon Hair Anointing Oil