the dose is different for different ppl....some feel great at 10mg with no side effects and some need more like 50mg or even 100mg , lots of ppl get side effects with taking more than 25mg a day like sweating , skin odor,acne, heart palpitation, high blood pressure, loosing hair and increase in facial and body hair grow.....you have to start low and see whats best for you ....my buddy is taking it at 10mg a day already for 2 years with no side effects, some ppl experience great results at 100mg short cycle.....if you are under 40 i wouldn't do it, its my personal opinion....there are much better products you can take .....