Interesting thread, glad it came back! My herbal medecine textbooks list cinnamon as a stimulant and antiviral. So, yes, I think the cinnamon does stimulate circulation and blood flow to the small capillaries in the area to which it is applied, if used externally, and general circulation if taken internally. It is also slightly emmenagogic (stimulates/increases menstrual flow) - something good for us women to know! And I would definitely second what Ktani has said about caution re: the coumarin content. Powdered cinnamon in usual amounts should be fine, but the oils can be more concentrated - dilution is a good idea. I've been trying it in a tea with other herbs for circulation, but it's too soon to tell the results hair-wise! Hoping I'll get results like saranne!