My 12 year old special needs son suffers from chilblains in the winter months. His toes looked so bad this year that I got to searching for something that would help. I came across the following article on using vitamin K. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2055974/
The researcher starts out by mentioning vitamin K is good for circulation, so thought maybe it would work for chilblains - which has to do with circulation. I gave my son one capsule a day and it cleared up the problem within days. I kept up this dosage for a week and now give it to him a couple of times a week. I will do so until it warms up outside.