Reliable, the patented formula of Zhi Ji Ji has been published in "The Lancet Neurology", and "The Lancet Neurology" is one of the oldest medical journals in the world. I bought this for my parents. My dad likes to drink it, just like children like to eat sweets. Now my parents have a good memory. My dad often goes out and invites people to play chess. My mom said that my dad’s chess skills have improved a lot.