Yarrow

Achillea millefolium

Yarrow has a seemingly contradictory capacity for stopping bleeding and increasing blood flow. It works on the micro-circulation (capillaries); maintaining the integrity of the vasculature, and also possesses compounds that intervene in the clotting cascade. 

Traditionally used as a herbal snuff for nose bleed. Also it is a key ingredient in a traditional anti-flu tea, along with elderflower and peppermint, in part due to it's ability to promote sweating.

Yarrow vinegar and Yarrow glycerite are both component parts in an immune tonic used by herbalists providing first aid in the makeshift camps in Calais and Dunkirk.