My husband has been taking Reishi Mushroom Spore since 2016 to boost his immune system after experiencing health challenges. Initially we used a different brand and always purchased from China. It was to our great relief that we found Reishi product from Sino-Sci during the covid and store in New York handles shipping to Virgina where we live. Sino-sci product has higher content, and less packaging which is more friendly to the environment, it is less expensive as well compared to the other brand we used before. I now start to take it myself as well to improve sleeping and immune system. I cannot see any obvious result yet for myself, but I know it works for my husband who has been take it for the 9th year right now. Thank you, Nancy