Cayenne(Capsicum annuum): Cayenne or red pepper is the most useful of the systemic stimulants. It stimulates blood flow, strengthening the heartbeat and metabolic rate.¹⁵ A general tonic, it is helpful specifically for the circulatory and digestive systems. It may be used in flatulent dyspepsia (imperfect or painful digestion) and colic.¹⁶ If there is insufficient peripheral circulation, leading to cold hands and feet and possibly chilblains (a form of cold injury characterized by redness and blistering), cayenne may be used. It is also useful for debility as well as for warding off colds.¹⁷ Externally it is used in problems like lumbago (a dull, aching pain in the lumbar region of the back) and rheumatic pains.