Bests & Worsts Reviews from Amazon

I had been buying this product for my dog at my vet's office previously. The reason I was using it was to help my dog sleep at night. Prior to using this, he had insomnia several nights a week. After a few weeks of using the product sold at my vet's office, my dog started sleeping through the night regularly. I think decided to buy this product on Amazon, and shortly after using the Amazon product, my dog started having sleep problems again. It wasn't until I went to order more that I realized that the dates of when I started using the Amazon product and when my dog started waking up again coincided. So I decided to purchase the next batch from my vet, and as soon as I started using the product from my vet's office, my dog started sleeping at night again. My vet said it's possible that the Amazon product wasn't stored properly and therefore lost effectiveness. It's hard to know for sure, but from now on I will purchase this from my vet.