Where is Vitamin D3 sourced from? by admingr | Mar 12, 2024 | 0 comments Vitamin D3 (Natural Cholecalciferol) is sourced from lanolin, which comes from sheep’s wool. Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.