I have seen Raynaud’s in many winter athletes like skiers and ice climbers who are routinely exposed to cold. It seems to develop as a response to cold and especially if you have had frostbite. I find I personally can get pretty good relief by takin time released Niacin. This is a vasodilators and if taken before you expect to expose yourself to conditions that normally cause the Raynaud’s to flair up will in my experience eliminate the problem. Niacin will cause flushing of other parts of the body and you’ll have to experiment with dosage.