From all that I have read about it, the only threat is that it lowers your milk supply. In my experience, it definitely does do that!
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I've been taking 1000 mg daily, but I've read all over the internet that some women take as low as 100 mg/day. It varies pretty widely.
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Many people take a break from it during AF, to let the body do it's own "cleansing" so to speak. It seems that most women either stop taking it immediately when they find out they are pregnant, and some take it in smaller doses through the end of the 1st trimester.
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I personally was having such irregular periods, that I started taking it as soon as I bought it (a month and a half - 2 months after last AF). Within a week I saw my CM start to follow the pattern that it would in a normal cycle.
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Hope that helps!
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