There are two main forms of dietary iron:
1) Heme iron (more absorbable, found in animal foods)
2) Non-heme iron (plant-based, commonly used in supplements)

Heme iron is often preferred because it is:
1) Easier to absorb
2) Less affected by foods like coffee, tea, or calcium
3) Sometimes gentler on the stomach

The best way is bloodwork.

Common tests include:
1) Ferritin
2) Hemoglobin
3) Serum iron
4) Transferrin saturation

Low energy can have many causes, so it’s best not to guess.

Heme iron is generally less likely to cause constipation compared to many non-heme iron supplements. That said, everyone is different — hydration, diet, and dosage still matter

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