I think you're thinking of vit K.
It does not stop blood flow, but a lack of it will prevent clotting.
it makes the blood into clots
platelets
To open and close to allow the flow of blood and to stop the flow of blood.
supplement that are good for the skin thats vitamin(e) vitamin (K) from what i read is good stop blood clots
The word must be "halt." The meaning of the word, 'Staunch' when used as a verb, is "to stop the flow of something, particularly blood".
Coagulation or clotting means to stop blood flow.
Platelets.
hemostasis
the stop of blood flow to the heart
if the heart stops
To stop the back flow of blood.
put mallet up it