Ryukakusan Direct, Sore throat remedy with natural herbal granulated powder sachet / Mint or Peach flavor Ryukakusan is the result of a rich and extensive tradition, originating in the Edo period, which benefits from the combined wisdom of Japan, China and the Netherlands – excerpts from Ryukakusan Official Website Effect-efficacy: Cough, frog, hoarse of rough throat, sore throat, throat ache and throat swell.
