Can you take Iron and Selenium together?
Some evidence suggests iron and selenium may interfere with each other's absorption. Separation is a reasonable precaution, though the data is less robust than for other iron interactions.
Severity
Caution
Evidence
limited
Timing
Separate by 2+ hours.
How it works
Potential competition at the intestinal absorption level, though the specific transport mechanism is not well characterised.
The evidence is weaker than for iron–zinc or iron–calcium interactions. Separation is precautionary rather than based on strong clinical data. Both minerals have low toxicity thresholds, so optimal absorption matters.
What to do
Separate by two hours as a precaution. Iron on an empty stomach, selenium with a meal. If using selenomethionine, the risk may be lower.
Frequently asked
Should I separate Iron and Selenium?
Consider separating them. Separate by 2+ hours. Consult a healthcare professional for personalised advice.
Why do Iron and Selenium interact?
Potential competition at the intestinal absorption level, though the specific transport mechanism is not well characterised.
How strong is the evidence for this interaction?
The evidence is limited. This interaction is based on theoretical mechanisms or a small number of studies.
About these supplements
Other Iron interactions
Other Selenium interactions
Related reading
Check your full stack
for interactions.
See what competes, what combines well, and when to take everything. Every interaction cites a published source.
Stack
6 supplements
Stack review
1 flagZinc and Iron compete for the same absorption pathway. Take at least 2 hours apart.
Supplements
This information is for educational purposes only. It is not medical advice and does not diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare professional.