How effective is birth control in reducing flow? Is it worth it for just that reason?

Depending on the type of birth control you use, you may see no change in your menstrual flow or a significant reduction in flow. Progestin-only methods like some IUDs, the nexplanon implant, and the depo provera shot tend to be the forms of birth control where we see the most reduction of menstrual flow.

You would want to have a conversation with your doctor about what is best for you. That way, you can be sure of how effective those different approaches are and whether they are worth it for you.