For the last few years, this has been out of stock for months at a time, usually near late spring or early summer. This year it seemed to be unavailable for six or seven months. Finally it was back in stock and I bought a six month supply (which arrived Christmas Eve) and I will probably stock up for a year. I have taken this supplement since it was prescribed to me in the 1990's. I had been stiff and sore this winter and had chalked it up to cooler weather. However, after the first night's dose, my joints were more flexible and my muscles less tight. My sleep quality was immediately and significantly improved. And my dry eyes weren't dry any more! I had no idea this was helping me as much as it is. I highly recommend this product for folks with FMS and osteoarthritis based on my experience.