25 is a good starting point, take temp often and adjust as needed. Prov is similar to winny has she done DHT before? If not id start with half that or 10mg anavar is better.
Currently out of anavar so was gonna sub with Proviron since its still mild and similar (ish). And my proviron tabs are 50mg. So breaking them into quarters isnt great.
Use a mill and pestal if you have one. Or a plate. Crush well and stir well...devide into 4-5 lined as even as possible. I had anavar 50mg and my girl did 10 a day. With winny or prov keep an eye on things like voice change.