Maca root dose?

Emily

What dose of maca root should i be taking to aid PCOS? Im seeing so many options and doses as high as 20,000mg which to me sounds like too much of anything. There is also yellow maca, red and black and all say for high performance training. I dont want it to make me bulk or increase my heart rate or anything i already can sometimes get atrial flutters. Whats the recommendation?