Don't use. One of those questions when they deceive stupid girls and suggest what is useful. It is better to drink flaxseeds, buy oil in the church and drink in spite of that deceiver, he will not deceive.
In the same amount as any other protein, if it is from a healthy person. At least make cookies based on it, add to coffee in the morning or somewhere else.
I think a glass after every meal will not hurt. Better not on an empty stomach - do not kill your appetite.
But intravaginally in the last trimester it is better not to abuse it - sperm provokes contractions.