美国采购需求：天然油、卡斯蒂利亚肥皂、护手霜、护肤品

I'm interested in your Castile Liquid Soap and would like to know more about its ingredients. Specifically, could you provide details on the source of the vegetable glycerin used in the formulation? Understanding the origin of the glycerin is important for assessing its quality and suitability for my needs. Any additional info about the soap's formulation would also be appreciated. Looking forward to your response!