25mg would be more on the low dose end but I definitely wouldn't consider it to be a micro dose. May I ask what your primary purpose is for taking it as that may give me a better idea of the situation, necessity, alternatives, etc. Thankfully proviron is not very hard on the body at least compared to other oral AAS but it still doesn't come without risks especially long term even at 25mg daily. Given your age the largest concern in my opinion would be prostate health as proviron can cause enlarged prostate, increased PSA levels, and possible acceleration of existing prostate cancer. It varies but also risks for negative cholesterol impact, natural test suppression (if your on TRT this doesn't matter), and lastly liver (can become a concern with daily use). I'd highly advise against it but if you are set on it then at minimum get some frequent bloodwork on PSA, cholesterol, liver markers, and test (if not on TRT).
But as said above if you could indicate your specific use case for proviron then maybe I can provide some more help.
Also welcome to Meso, I just saw your introduction and I believe you will enjoy it more here. Solid community, good information, and a lot less shill bullshit.