From the databaseWhat the row says.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
Pair type
Timing Sensitive
Scope
Supplement × Supplement
Last verified
June 4, 2026
Timing SensitiveInsufficient evidence
What is happening. Slippery elm mucilage can reduce reliable iron absorption if taken together.
Mechanism. Gel-forming mucilage can bind or physically separate minerals from absorptive surfaces.
Recommendation. Separate iron by at least 2 hours, especially when treating deficiency.
TimingTiming & separation.
Space the doses apart by at least this window to avoid the conflict.
Stack Score
How it moves the number.
Effect on the composite score
If both Iron and Slippery Elm 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 at /methodology/stack-score.
SourcesSources, by evidence tier.
Every claim on this page is cited. PMIDs link straight to PubMed.
Reference material
1- 1Natural Medicines. Ulmus rubra monograph. 2024.Needs sourceNo link