Natural - present in or produced by nature; not synthetic or imitation; "a natural pearl"; "natural fuel"; "natural silk"; "natural blonde hair"; "a natural sweetener"; "natural fertilizers" Another assessment of five scientific tests confirmed improved executive purpose, focus, and response time in people who took ashwagandha. Retrieved March eighteen, 2018. https://socialbaskets.com/story5640015/a-simple-key-for-safe-herbal-supplements-for-daily-use-unveiled