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Po Sum On Medicated Oil is a traditional Chinese topical analgesic formulated for the temporary relief of minor aches and pains in muscles and joints, as well as symptoms associated with the common cold, headaches, and insect bites. Developed by the PO Sum On Medicine Factory in Hong Kong and in continuous production since 1907, the product is a blend of herbal extracts and essential oils, typically including peppermint oil, menthol, camphor, and cinnamon oil. The oil functions as a counterirritant; when applied to the skin, its active components stimulate sensory receptors to create warming or cooling sensations that distract the brain from deeper pain signals and promote local blood circulation to the affected area.
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