Start With The Iron Source On Your Plate
Every meal begins with one iron-containing food or supplement.
- 15–35%: Heme iron absorption (meat, poultry, fish)
- 2–20%: Non-heme iron absorption (plants, grains, supplements)
- 8–18 mg: Adult iron RDA (varies by sex and age)
- ~25%: Global iron deficiency (most common deficiency worldwide)
Heme vs non-heme iron
Heme iron from meat absorbs far more reliably.
Why the source matters first
Non-heme iron absorption swings wildly with the rest of the meal.
This tool tracks a non-heme plant-based iron source throughout.
Add Foods And Drinks Around The Iron Source
Everything eaten in the same sitting shares one absorption outcome.
- 2–4: Foods per typical meal (combined on one plate)
- Citrus, pepper: Common enhancers (vitamin C rich foods)
- Tea, dairy, grains: Common inhibitors (tannin/calcium/phytate rich)
- Single meal: Interaction window (co-intake timing matters most)
One meal, one absorption verdict
Enhancers and inhibitors act together in the same gut window.
Use the two sliders
Dial vitamin C and inhibitor foods to rebuild any real plate.
Vitamin C Converts And Chelates Iron For Uptake
Ascorbic acid can triple absorption of plant-based iron.
- Up to 4×: Vitamin C absorption boost (non-heme iron multiplier)
- ~25–50 mg: Effective dose (vitamin C per meal)
- Fe³⁺ → Fe²⁺: Mechanism (reduces ferric to ferrous iron)
- Soluble complex: Chelation effect (keeps iron absorbable in gut)
Reduction and chelation
Vitamin C reduces iron and keeps it dissolved in the gut.
Best enhancer foods
Citrus, peppers, tomatoes, and berries all work well.
A glass of orange juice can meaningfully lift iron uptake.
Tannins, Calcium, And Phytates Bind Iron Shut
Common drinks and foods can block most non-heme iron.
- Up to 70%: Tea tannin reduction (polyphenol-iron binding)
- Up to 60%: Calcium reduction (competes at transporter)
- Up to 80%: Phytate reduction (grains, legumes, nuts)
- ~40%: Coffee reduction (chlorogenic acid binding)
How binding blocks uptake
Inhibitors form insoluble complexes iron transporters cannot use.
Timing helps
Spacing tea or dairy away from meals limits the loss.
Even one cup of tea with a meal cuts absorption sharply.
The Whole Plate Decides The Final Absorption Rate
Enhancers and inhibitors push and pull the same pool of iron.
- ~20–24%: Best case net absorption (iron + vitamin C, no inhibitors)
- ~1–3%: Worst case net absorption (iron + tea, calcium, phytates)
- 1–2 hours: Practical spacing tip (separate iron from inhibitors)
- Add vitamin C: Pairing tip (citrus, pepper, tomato with iron)
Push and pull combine
Net absorption is the balance of every food on the plate.
Plan meals with this in mind
Small swaps in timing meaningfully change how much iron you keep.