I took 320 mg/day of the GNC brand for almost a month. Disappointed that I had to stop.
I would recommend that you try this if you think your acne is largely related to DHT. My acne turned horrendous at the exact same time as I started losing hair 11 months ago. My hormone levels are supposedly normal, but that says little about the way my body responds to DHT etc., look into it.
The brain fog was weird. For some people, inhibiting 5-alpha reductase can affect cognition. I appear to be one of those people. VERY FRUSTRATING. However, taking saw palmetto was valuable because I learned more about the root of my acne, complex though it is for all of us..
It's been about 2 weeks since I stopped taking it, and the brain fog is gone. My midsection has also slimmed down to a more normal size. Yes, saw palmetto acted as a diuretic, but I seemed to be laying on the fat a lot faster than normal while on it!
The acne is definitely back, and I know it'll be back to its normal level soon. As far as the hair loss goes, I think saw palmetto helped, but I'd have to have taken it longer to conclusively say either way.
Try this ladies, a lot of people see good results and zero or negligible side effects. Guys, research it.