This product came highly recommended for my chronic joint pain. I began taking the product and by day two I had a severe headache. Since I am prone to headaches, I continued to take the product for another four days. The headache never subsided for the entire five days, so I discontinued the product. Within 24-hours, the headache was completely gone. However, I do know this product has 'worked miracles' for others. It just was NOT for me. I suggest you try this product but discontinue it immediately if you get an uncontrollable headache. Amazon did allow me to return the product for a full refund. As always, Amazon is THE GREATEST! Thank you.