Ken–I shop at Palm Harbor Natural Foods (US 19&Curlew Rd) and remember seeing MD6 on the shelf. That’s all I’ve seen of Biotest down here. I get any Biotest stuff off the Netrition.com website. BTW HealthNutwearhouse.com has Mag-10 for I think 59.95 a bottle. If you can’t order online ask the health food store mgr to order it for you.