I've used conceive plus for the first time this cycle (too early to tell if it was successful!) and loved it. And so did the OM... It did leave a chalky residue on my bedside table. I suppose that just proves it actually DOES contain calcium, as the label promises! Headbanger Tue 14-Sep-10 12:09:21 (http://www.mumsnet.com/Talk/conception/1040902-preseed-or-conceive-plus)