Since when do two essential elements become antagonistic? This is ludicrous! I received great benefits from magnesium but calcium filled in the areas that mag itself did not. I suffered from muscle cramps eye twitches heart palpitations insomnia and anxiety! The Mg releived the palpitation and the eyetwtches but the insomnia and leg cramps plus the anxiety where not relieved until I added calcium.
These two essential elements work together most effectively!
I speak from experience!