I’m looking for information about Usana

My sister-in-law is involved with the group and she is pressuring my mother-in-law to get blood drawn so they can look for things she is allergic to that might be the cause of her colitis. This sounds really weird to me. It costs an initial $500.00. They sent her a kit and a Dr’s order to get blood drawn. I think this goes way beyound pushing vitamins and skin care products. Has anyone had any experience with Usana? What are they settting her up for?