Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Fantastic product

My nails have always been weak and were made worse by gel nails - I had some kind of allergic reaction. 12 months later and my nails were still flaking and peeling. I tried everything including the more expenisve French version of this product - nothing worked. Even taking Biotin had no effect. I saw this product and thought "Why not?" I have been using it several times per day and it is actually working. It has been a month, and, although I don't have long nails (yet), there is a significant difference in the nail strength and the peeling is becoming less evident. I will continue to use this product.