CPA is so strong I only use 3 x week 12.5mg and that's enough to lower my libido and semen by 80%
At 4 x week 12.5 mg my libido and semen is reduced 100%.
In a 4 month cycle I only use it for the first month. This current cycle I extended it a second month, but dropping dosage to 2 x week at 12.5mg - the result: libido and semen still reduced 100%, no production. The conclusion is let it build up first month, then cruise at lower dosage second month.
What I hate about CPA is it disturbs my regular sleeping pattern. My alarm is set for 5:30am, but on CPA I wake at 1,2,3am and it's hard to fall asleep after. Other sides, I get a small lump only under my left nipple, hardly noticeable unless you point it out. Shrinks by 2/3 in one month after getting off CPA. Semen and libido go back to normal after 3 weeks staying off it.
Those that are taking 50mg CPA daily you should try the above first. My theory is if it cuts off semen production then that's good enough for hair loss or attempted regrowth. And I'm 6'3 190lbs, so if you're smaller bodied you may even need less. However, I can't claim to have grown a Antydhtor hairline - maybe if I stayed on it for several months? Don't know if I can handle the bad sleeping for that long.
You haven't maximised your hair growth potential until you add CPA, the toughest AA available in my opinion.