In a normal period, you should not lose more than about 80 mL of menstrual fluid over all the days of the bleed. That’s equivalent to about five tablespoons spread over all the days of the bleed.
In episode two of my podcast/YouTube video, I discuss heavy periods including the role of hormone imbalance, mast cell activation, and insulin resistance; simple period-lightening strategies such as iron, zinc, and a dairy-free diet; and using body-identical progesterone to lighten periods.