一種芳香物質，可以從樟樹提煉，亦可人工合成，擦在皮膚上會使血管擴張，當一直使用時，會造成皮膚刺激及皮膚炎
An aromatic substance, which can be extracted from camphor tree or synthesized artificially, can dilate blood vessels when rubbed on the skin. When used all the time, it will cause skin irritation and dermatitis.
ref.
British Journal of Dermatology, November 2000, pages 923-929
Clinical Toxicology, December 1981, pages 1485-1498
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