One more suggestion - this one also worked just as well as the chaste tree tincture. It's just a matter of whether you want an herbal or purely macro approach. You can make a black bean juice by boiling 1 cup of black beans to about 5 cups of water for about an hour and 1/2. You can then drink a cup of this juice 1-2 times per day. You can save it for 2 days and heat slightly before having a cup. This works amazingly to regulate cycles and encourage a healthy flow. You can read about this in a book "Healing Ourselves" by Naboru Muramoto - it is out of print but can be purchased used.