planning to start taking fin

19 yrs old palang ako pero grabe na yung pag recede ng hairline ko. i have a few questions lang before i start taking fin

1. i go to the gym regularly kasi, would it affect ba sa performance?

2. cheapest available na fin since student palang

3. i take supplements (creatine, magnesium, fishoil, vit c) makaka affect ba sa pag take ko ng fin?

4. planning to take 1.25mg M,W,F is this a good starting point?