I was recently running generic blue tops and couldn't take more than 2iu without my face and stomach completely bloating up. I switched to Black Tops (batch #31) and LOVE them. Im treating them as 10iu kits and taking 3iu per day split am/pm. Absolutely zero bloat in my face and stomach, but I am experiencing bad CTS at night and a little throughout the day. Did not experience CTS on Bluetops. Blacktops make me tired as fuck all day long as well. At least I know its working.