Bests & Worsts Reviews from Amazon

I bought this for my dog to help in managing back issues. It helped at first, after a while it stopped being as effective and his overall health was declining. I could not figure out why, and after a few months, started researching and found out this product contains chemicals that can cause reproductive harm and cancer. I believe lead in this product is the cause. I took him off the product, and noticed a improvement in his health that same day. Please be careful with this product.