Im not a rep, but just some general gardening info for ya.. Calcium and Magnesium are both "Macro" nutrients. In the description on page one for the base, "Core A and B", it says that it provides the macro and micro nutrients needed from start to finish, so I'm assuming that's why there is no stand alone calcium or magnesium product. I also see that they have an Si (silica) product as part of their line up, which works hand in hand with the provided calcium. That description says it uses different silica sources, and one of the most popular sources used for plants is calcium silicate. So it looks and feels like calcium is more than covered.. This lineup actually reads like a true complete lineup.. I can't see any nutritional gaps! This should be a good product for you all to test!!