how long do you have to give the loading dose? it doesnt actually say on the tub. my boy has had a week on it so far and he's still pooing for britain.
are you feeding haylage? if so try the haylage balancer instead works in days.
pink powder and the haylage balancer are about the only naf products that are actually what they say they are on the tin!!!
i used the pink powder on my mare last year and she gained condition really well, over a quick period of time.
I've used it a lot for many different horses, some it works faster for than others, I'd say after a month if it isn't helping it probably won't. I have seen results in a few days but normally it's a couple of weeks.
I understand that Brewers yeast has little or no vit A, C, D or E whereas NAF pink powder is a general purpose supplement. So can't really compare the two?