I take calcium & magnesium. My midwife with Anelise recommended them for restless legs and to help with SPD. I don't know if it did work but I didn't have SPD with Anelise who weighed 8lb 13oz but I had it with Harrison the pregnancy before and he was 7lb 10oz. I'm not risking it again so definitely taking the calcium & magnesium in case it was that that worked for me last time