JoAn, I surely do wish that I could remember the books and articles that I read back in 1968 concerning calcium and muscle/uterine cramping. In those days, I had no interest in logging references. I was just trying to solve my own problems and feed my babies. The texts and articles didn't say that if I took extra calcium/magnesium my milk supply wouldn't drop before my menstrual period, but when I read about the connection between the blood calcium levels dropping and uterine cramping I assumed that it would help with the milk supply problem too, and it did. Since that time "clinical experience" and reports from friends and family have confirmed what I gleaned in those long-ago readings. I haven't tried to find current published material on the subject. I know that many of you can't pass on information that is not in current research literature and I'm sorry that I can't supply such references on this topic. But it *is* anecdotally sound amidst 30 years of personal, LLLL, and more recently, LC clinical experience. Patricia Gima, IBCLC Milwaukee, Wisconsin, USA mailto:[log in to unmask]