I'm sure he took some sort of pills like Nutrex Lipo6.
With the super pill i did 5km on threadmill daily, 5x a week. Loose 1kg per day for 2 weeks and then the weight loss slows down. But able to maintain. Cnnot stop taking the pill else no motivation to run.

dangerous of?
No la. i took 3 months, break and took another 3 momths no problem. you can feel the potency almost immediate. During working hour also feel like work out.

Now i stop already la

Most stuff that works are dangerous

Steroid for example