A friend of mine uses a combonation of White willow bark, or black cohosh with raspberry leaves for her super moody and crampy mares. One in particular was prone to colic every cycle and this helped her immensely. Ive used raspberry leaf for stressful events too, like moving to a new barn, or getting a new pasture mate. One mare in paticular is not good with change and I kept her on it for 3 months to help her adjust calmly. Never used it on geldings though, but the ones I play with tend to all act like gentleman regardless lol.