Research statusCatalogued record, not clinically approved.
Citation presence and an automated evidence check are not medical review.
This pair has not completed NutriStack's standalone publication gate. Attached sources may mention one or both substances without establishing the stored interaction type, direction, severity, dose, management advice, or combined safety. The page is excluded from search indexing and must not be used to start, stop, or change treatment.
From the databaseWhat the row says.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
Scope
Supplement × Supplement
Last updated
July 13, 2026
SynergyStrong evidence
What is happening. Vitamin C dramatically increases non-heme iron absorption by reducing ferric iron (Fe3+) to ferrous iron (Fe2+) and forming a soluble chelate.
Mechanism. Ascorbic acid reduces Fe3+ to Fe2+ at the gut brush border, forming a soluble iron-ascorbate chelate that remains bioavailable at intestinal pH.
Why it matters. Take 50-100mg+ vitamin C with iron supplements to maximize absorption (higher doses showed no further benefit).
Recommendation. Take 50-100mg+ vitamin C with iron supplements to maximize absorption (higher doses showed no further benefit). Especially important for plant-based iron sources.
Direction. Vitamin C changes how Iron behaves.
Stack Score
How it moves the number.
Effect on the composite score
No numeric score interpretation is published for this unreviewed pair record.
Stack Score is a NutriStack product heuristic, not a clinical risk or benefit grade. An unreviewed database label must not be treated as a safety or benefit signal. The algorithm is documented at /methodology/stack-score.
SourcesSources, by evidence tier.
Sources attached to the record. Some support an ingredient or mechanism rather than a study of the exact pair; PMIDs link to PubMed where available.
FAQCommon Iron + Vitamin C questions.
Plain-language answers drawn from the interaction record on this page.
Can I take Iron and Vitamin C together?
NutriStack catalogs Iron and Vitamin C as a potential synergy. Confidence depends on whether the sources below study the exact combination. Vitamin C dramatically increases non-heme iron absorption by reducing ferric iron (Fe3+) to ferrous iron (Fe2+) and forming a soluble chelate.
What kind of interaction is it?
Potential synergy: the stored record proposes a useful combination effect, but the sources and evidence caveats determine whether the exact pair has been tested.
How does this affect a NutriStack Stack Score?
No numeric score interpretation is published for this pair because its stored label has not completed source-level clinical review.
What do the cited sources establish?
NutriStack lists 3 source records with this Iron + Vitamin C entry. A source may support an ingredient, mechanism, or safety concern without testing the exact pair, so citation presence alone does not prove the visible verdict. Full sourcing methodology is at https://nutristackapp.com/methodology/interactions.
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