I think I had a neighbor who used to sell his supplements. Some members here feel better taking certain supplememts- try reading the blog section. If I remember, Shackel's products are expensive and you may do better with some more research.
I was not clear in asking about Steven Shackel's website. He is not selling supplements, it was the THEORY section of the website that was fascinating. You can google Steven Shackel and see what you think.