Abstract: A method of enhancement of body heat production by application of whole seed of rubefacient mustard herbs of the Brassica genus and of herbs classified in the botanical family Cruciferae, in an anelastic breathable and pliable shell, whereby a balance between enhanced body heat production induced by whole seed of rubefacient herbs and heat dissipation is established, providing a steady warming effect without excessive heat build-up. A body warmer using the above method, comprising a shell of anelastic breathable and pliable material, divided into chambers containing whole seed of rubefacient herbs, and means of attachment to keep the warmer in place in desired area of human body.