Hi, Glad to see you back!!! I'm not sure if there are different yellow caps or not but I am taking 30mg yellow phen caps they say E647 on them and I'm pretty happy with them I started them around Aug 29, and I have lost around 27 lbs. I'm not sure if thats good or not. Actually 19 of that 27lbs is from the first month. I've only lost about 8 lbs in the last 2 wks
But I know they say you don't want to lose too fast, but I do!!! Hope this helps