In 1936, a well-known Chinese traditional medical practician Mr. Chan Leng Yong immigrated to Thailand during the major emigration wave. Seeing a scarcity of basic needs and medicine for new immigrants, Mr. Chan decided to continue his medicine practice and even started producing his own products. He became much trusted in the community.
Mr. Chan adopted traditional Chinese medical methods and formulas and produced an unique medicinal oil to give away to his patients. There was a young man by the name of Boonchua Eiampikul who was eager to learn Mr. Chan's methods and soon become an apprentice. As time went by, Boonchua lived up to his master’s expectations and refined the medicinal oil to the present from of “Siang Pure Oil”, a top-quality product recognized by the pharmaceutical industry.