Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Excellent for bones, hair and nails

Biosil is excellent for bones, hair and nails. I took a serious fall last year and injured my tailbone quite badly. Biosil, in conjunction with a good calcium, has completely healed the injury. Jarrowsil, a similar product, helped but only a little.At 50, I started to have dramatic hair loss. Having always had gorgeous hair, this was not fun!! Biosil made a huge difference. I then added Biotin and my hair is back to it's luscious volume.My nails have always been good, but now they are stronger, and I get compliments all the time.Highly recommend Biosil for bones, hair and nails.