Instruct: Classify Amazon reviews into positive or negative sentiment
Query: superb stuff

buy it for my elderly mother, she takes 2 caps in the morning with food and 2 caps in the day with food. she reports with much better energy, clarity of mind, sense of well being and piece. the minute she gets off of these, lack of energy, lack of sleep, anxiety, forgetfulness. so i am keeping her on these for as long as possible. good stuff.