Here's the deal. I have an under active thyroid. A few years back I gained 50lbs in 6 months despite hitting the gym 6 days a week and eating clean. Not only that but I was always cold, my skin and nails were looking awful and I was getting migraines weekly. I went to many doctors and specialists and had every test done. I knew what was wrong because my mom has an under active thyroid. The problem was every time my thyroid was tested my Free T3 came back at 2.4 pg/mL and the normal range is 2.4 - 4.2 pg/mL so of course the doctors refused to treat me. Those ranges are bull, what's normal for one person might not be normal for another. I knew even though I was barely within that "normal range" that 2.4 pg/mL was low for me. Since no one wanted to treat me I decided to try liquid iodine which helped a little, but I knew I needed the real thing. So for the past 3 years I have been getting T3 from GWP. Within 6 months of taking GWP's T3 I not only lost the 50lbs I gained but also my skin and nails went back to normal, no more migraines, no more feeling cold. So I know that my thyroid is the problem. Once I heard GWP was closing I ordered T3 from RUI and I started getting headaches and gaining weight within a month of taking it. Not only that but I found that their product tasted a lot like the liquid iodine I once took. Now I'm not saying that their product is not good, but I didn't feel that it worked well for me. I also tried several other suppliers and have had the same issue.