It can dilate capillaries, increase sweat gland secretion, promote blood circulation and improve metabolism speed. Has the effects of warming channels and activating collaterals, diminishing inflammation and dispelling cold, and relieving pain. It is also helpful for back pain, arthritis, chronic stomachache, diarrhea and neuralgia. It has the characteristics of natural non-toxic, anti-inflammatory, analgesic, relaxing muscles and tendons, promoting blood circulation and relieving muscle fatigue.

Extended data

Hot compress salt, also known as sea salt and dry salt, is generally composed of seawater or salinized substances, and is usually formed through a series of processes such as evaporation, filtration and drying of seawater. Hot compress salt is often used to make hot compress salt packets and physical therapy supplies.

Dissolve crude salt in water to remove insoluble impurities, then add refined preparations such as NaOH, Na2CO3 and CaCl2 to precipitate soluble impurities such as SO42-, Ca2+, Mg2+ and Fe3+, filter to remove, finally adjust the PH to 7 with pure hydrochloric acid, and concentrate the solution to obtain pure sodium chloride crystals.