Cross-referencing clinical data
A pairing appears on this page only when a trial gave both ingredients together and measured the result. European Hornbeam has none that clears that bar.
Stitching two separate single-ingredient studies into a pairing is the one thing this engine will not do. When a study of the combination itself holds up at source, it lands here with its citation.
No invented synergy. Where actives were studied on their own rather than together, the record shows each on its own evidence, never a combined effect no trial measured.
Research strength. Research strength says how much work stands behind the combination. It is never a product score.
Independent record. Every finding is cited to a named trial, dated, and never written by the brand.
20 pairings are live across the library today. Checked 20 July 2026.
No study gave these as a pair, so they are not in the card above. But the reason they belong together is settled biochemistry, not a guess, so it is worth knowing.
Hornbeam bark and leaf carry tannins, and tannins bind ferric iron in the gut lumen into complexes that are not absorbed. Anyone taking an iron supplement should keep a tannin-rich botanical a couple of hours away from it. The same applies to strong tea for the same reason.
Where tannins pull iron out of solution, ascorbate pushes back by reducing it to the ferrous form and holding it in a soluble chelate. The offset is partial and depends on the ratio of ascorbate to polyphenol. It is the standard way of managing the interaction rather than a synergy in the promotional sense.
Protein in the same serving mops up free tannins by binding them, which cuts the dry mouthfeel and also cuts how much free polyphenol remains available. For a formulator this is a palatability tool. For a user it means a botanical taken with a protein shake behaves differently from the same botanical taken with water.
The same phenolic hydroxyl groups that bind iron will complex zinc, though with lower affinity. Separating intake by a couple of hours removes the concern. This is general polyphenol chemistry applied to hornbeam rather than something measured for this species.
Carpinus betulus sits in the birch family, whose leaves are consistently flavonol-rich. Pairing the leaf with isolated quercetin stacks the same compound class. The species-specific constituent profile of hornbeam is much less characterised than that of birch, so this is inference from family chemistry.
Stacking two tannin sources compounds astringency and compounds the mineral binding in the gut. In a formula this shows up as a harsher mouthfeel and a larger separation window needed around mineral supplements. Worth naming because tannin load is additive across ingredients in a way people rarely track.
Nothing specific on file for European Hornbeam. Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.