A low ferritin result often sends your traditional or even functional prodider sending you an iron recommend.  OR, many people put "ferritin: iron storage" together with "take iron" and head straight to the supplement aisle.

Take iron.

More iron.
Higher dose.
Different form.

…Maybe experience some constipation.
Repeat labs.

Sometimes that's exactly what's needed.

But not always. And not often in our chronic clients!