The amount of time Provestra takes to work varies because of factors like hormone levels, age, and symptoms. For some women, it may not work at all. A younger woman with relatively balanced hormone levels may see noticeable results quicker than an older woman with excess testosterone. For this reason, Leading Edge Health suggests trying out the supplement for at least 30 days. Some people may see results in as little as a week, while others may take a month or longer to notice effects.