04/28/2026
Your iron labs might say “normal.”
That doesn’t mean optimal.
Ferritin is where this gets missed.
We were taught that anything above ~15 μg/L is fine.
But physiologically, iron deficiency starts showing up much earlier.
Research shows:
Iron-dependent processes start to decline around 22-28 μg/L
Many women experience symptoms even below ~45 μg/L
About half of premenopausal women fall in this lower range
So yes - you can feel exhausted, foggy, irritable…and still be told your labs are “normal.”
Iron isn’t just about anemia. It’s energy, focus, mood, and how your body actually functions.
If you feel off, it’s worth a closer look.