Timing Protocol
When to Take Iron — Expert Timing Protocols
Expert-analyzed timing recommendations for iron based on what 5 longevity researchers say about when, how, and what to take it with.
Quick Timing Guide
Take with vitamin C to enhance absorption (Johnson pairs heme iron + vitamin C in morning routine). Take on an empty stomach for best absorption, or with food if GI distress occurs. Avoid taking with calcium, coffee, or tea which inhibit absorption.
Strong Consensus
on Iron overall
Full Protocol
Timing
Take with vitamin C to enhance absorption (Johnson pairs heme iron + vitamin C in morning routine). Take on an empty stomach for best absorption, or with food if GI distress occurs. Avoid taking with calcium, coffee, or tea which inhibit absorption.
Dosage
Dose based on lab results. Iron bisglycinate is Hyman's preferred form for supplementation. Johnson uses heme iron. No expert recommends blind supplementation without testing.
Form
Iron bisglycinate (Hyman — gentle on stomach, better absorbed). Heme iron (Johnson — higher bioavailability from animal-derived form). Liquid iron for targeted dosing (Hyman, for athletes). Avoid ferrous sulfate if GI-sensitive.
Notes
Always test before supplementing — both deficiency and overload are harmful. Key tests: serum ferritin, serum iron, TIBC, transferrin saturation. Ferritin alone is insufficient because it is an acute-phase reactant (Attia). Retest every 3-6 months while supplementing. Menstruating women, vegans/vegetarians, endurance athletes, and people with gut absorption issues are highest-risk groups for deficiency. Screen for hereditary hemochromatosis if ferritin is persistently elevated (Hyman).
Expert Positions
What Each Expert Says About Timing
On the Huberman Lab channel, iron is discussed primarily through guest experts rather than a dedicated episode. Dr. Chris Palmer links iron deficiency to impaired mitochondrial function and mental health symptoms, noting that B12, folate, and iron are critical for mitochondrial health and directly impact psychiatric conditions. In his hair loss episode, Huberman identifies iron levels as a key factor in maintaining hair health alongside insulin sensitivity and hormonal regulation.
Unlock the Full Picture
Go beyond the consensus — see exactly what each expert says about iron.
- Per-expert timing protocols & reasoning
- Interaction warnings & disagreements
- Video citations with timestamps