I did not think that Nitrogen was an ingredient in clamag; So I went to the Botanicare homesite. From the Botanicare website: Ingredients of calmag 2-0-0: Cal-Mag Plus contains: calcium, magnesium, iron, boron, zinc, manganese, molybdenum, copper, cobalt, iodine, beneficial vitamins, twenty essential amino acids and select botanical plant extracts.

To be honest; Now that I read all the ingredients. this is more of a Micro formula. IN the greenhouse we use Calcium Nitrate, and Magnesiuim sulphate, so I don't add Calcium and Magnesium to my custom Micro mix, but, this is
basically the same ingredients in most micro mixes.

My Micro ingredients are Chelated Manganese, Chelated Zinc, Boron, Molybdate, and Chelated Copper. Calcium and Magnesium are sipplied as mentioned above.

Still don't know where the 2% of Nitrogen comes from on the bottle label.

Anyway; I don't believe you would need to worry about that as long as you are lowering the amnount of part A or the Nitrogen in your mix, as you should be in flower.