I take high doses of Vitamin C due to a rare Vitamin C defiency and really any brand will do. My doctor gives me a perscription (so the hospital pharmacy will provide it), but the brand they carry varies a lot and its the same stuff you can get over the counter at any grocery or drug store. I am not especially familiar with calcium supplements, but in the past my dr has had me take the generic version of Caltrate--- the version that has Vitamin D include. Supposedly Vitamin D is supposed to help your body absorb the calcium better......

L2L