I have used Clen. Honestly I did not like it very much. It worked well but the side effects were kind of crappy. Always hot and sweaty. Jittery. Insomnia. Cramping wasn't so bad with extra potassium. Overall I didn't like it. I'm not so sure of exactly what negative effects on the thyroid other than depleting T3 but I can't see them being good. Tell her to do some reading. There are safer ways to reach her goals

Clen is dangerous stuff man... not saying it won't work but unless she is VERY educated on it I would recommend staying away! As cheat said, ketosis diet will do the trick and won't make her twitch or get heart palpitations...

I tried using clen to cut down for a shoot a while back ( my first shoot ) and ended up stopping because I felt I was doing something extremely unhealthy to my body, it was awful. Being on tren at the same time probably didn't help as tren is the only form of AAS I've used thus far that has increased my BP significantly. Just cut the carbs brotha I know it's not fun but I promise she'll live through it