The Research Centre, Xiyuan Hospital, China Academy of Chinese Medical Sciences, developed the formula for WNK and the placebo. Tianjin Zhongxin Pharmaceutical Group Co. Ltd., a pharmaceutical manufacturer in China with an Australian Good Manufacturing Practice license, prepared the trial medications. The placebo was prepared and designed to taste, smell, and look the same as the Chinese herb medicine (CHM) formulation.
WNK and the placebo were in the form of capsules pre‐packaged in blister packs each containing 60 mg of the active ingredients (ratios of the ingredients by weight being 5:5:1 with the least amount being saffron). The dosage of the WNK in the clinical trial was one capsule, three times daily by oral administration.
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