NutriStack
Elderberry and Iron, timing-sensitive.
Taking elderberry at the same time as a non-heme iron supplement can blunt iron uptake because elderberry polyphenols bind iron in the gut. The effect is dose and timing dependent: it matters mainly when the two are taken together on an empty stomach or with the same meal, and it is most clinically relevant for people actively correcting iron deficiency or iron-deficiency anemia. Separating the doses largely avoids the problem and does not require stopping either supplement.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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At a glance
- Substances
- Elderberry and Iron
- Pair type
- Timing Sensitive
- Evidence (highest tier)
- Moderate
- Source citations
- 4 sources
- Stack Score effect
- −5 to your Stack Score (per scored timing-sensitive row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Timing Sensitive · Moderate evidence
Timing Sensitive
What is happening. Taking elderberry at the same time as a non-heme iron supplement can blunt iron uptake because elderberry polyphenols bind iron in the gut. The effect is dose and timing dependent: it matters mainly when the two are taken together on an empty stomach or with the same meal, and it is most clinically relevant for people actively correcting iron deficiency or iron-deficiency anemia. Separating the doses largely avoids the problem and does not require stopping either supplement.
Mechanism. Elderberry (Sambucus nigra) fruit is rich in polyphenols, especially anthocyanins (cyanidin 3-glucoside and related cyanidin glycosides) plus flavonols such as quercetin. These polyphenols chelate non-heme (ferric and ferrous) iron in the gastrointestinal lumen, forming insoluble iron-polyphenol complexes that the enterocyte cannot take up. Cyanidin-type anthocyanins carry free hydroxyl groups on the B ring that readily complex iron, so co-ingesting an elderberry product with an oral iron supplement reduces the fraction of iron available for absorption. This is the same well-characterized polyphenol-iron interaction seen with tea, coffee, and other anthocyanin-rich berries, applied to the specific polyphenol profile of elderberry.
Recommendation. Separate elderberry and oral iron by at least 2 hours. Practical pattern: take iron on an empty stomach (or with a small amount of vitamin C to aid absorption) in the morning, and take elderberry later in the day. If you are being treated for iron deficiency, prioritize iron timing and keep elderberry well away from the iron dose. No need to avoid elderberry entirely; just do not co-administer with the iron tablet.
Minimum separation. 2 hours
Sources (4)
- Brunet et al., Fruit extracts of 10 varieties of elderberry (Sambucus nigra L.) interact differently with iron and copper, Journal of Functional Foods, 2016.
- Hurrell, Reddy and Cook, Inhibition of non-haem iron absorption in man by polyphenolic-containing beverages, British Journal of Nutrition, 1999.
- Reviews on quercetin and flavonoid regulation of intestinal non-heme iron absorption.
- Reviews on anthocyanin-metal interactions describing cyanidin B-ring hydroxyl chelation of iron.
Stack Score
How this pair moves the number.
Effect on the composite score
If both Elderberry and Iron are in the same stack, this pair applies −5 to your Stack Score (per scored timing-sensitive row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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