Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very tart

Pluses: well thought out product, very necessary, read up on Magnesium vs Calcium consumption while you are at it.Minues: more tart (i.e. acidic) than you would expect from a vitamin supplement. Highly acquired taste.Not sure there is an alternative product. Maybe someone can comment on this review and let me know of one.