It's hard to say since I was also recovering from a C-section and dealing with a newborn, but... probably a month? My blood was literally the consistency of Kool-Aid and I didn't have the energy for much of anything. I'm still taking them four months later. There's iron in the multivitamin I take, but if I stop taking an additional supplement I can feel the exhaustion set in within a day or two.
My husband takes B12 vitamins and they help his energy level a lot. Maybe just start with a good multi?
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