Cross-referencing clinical data
A pairing appears on this page only when a trial gave both ingredients together and measured the result. Gravel root 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.
Gravel root and dandelion root sit together in North American and European folk formulas built around urine flow. Both are used traditionally to increase urine output, so combining them is assumed in folk practice to push in the same direction, though nothing has measured whether the effects add. There is no controlled human work on the pairing, and anyone on a prescribed diuretic should raise it with their prescriber first.
Marshmallow root contributes mucilage, which folk practice added alongside gravel root for its coating quality. The rationale is textural and historical rather than pharmacological. Read it as a formulation habit with a long paper trail and no trial data.
Any preparation that raises urine volume also raises the amount of potassium and sodium leaving the body in that urine. Traditional diuretic herbs are used long enough at a time for this to matter. The size of the loss with gravel root specifically has not been measured, so the caution is directional rather than quantified.
Magnesium is lost in urine alongside sodium and potassium when output rises, and magnesium status is already marginal in a lot of people. Extended use of a folk diuretic is the situation where this becomes worth tracking. No study has quantified magnesium loss with this particular herb.
Both plants carry unsaturated pyrrolizidine alkaloids, and PA exposure is judged on total intake across all sources rather than per product. Stacking two PA-containing herbs raises the cumulative load without any label showing it. This is the single most important anti-synergy for gravel root and it argues against combining them at all.
Milk thistle often appears next to PA-containing herbs in blends on the assumption that it offsets hepatic load. Nothing has demonstrated that silymarin reduces pyrrolizidine alkaloid activation or the protein adducts that follow it. Adding milk thistle does not license a higher PA intake.
Nothing specific on file for Gravel root. Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.Read this carefully. These are 41 voluntary, unverified reactions reported to the FDA (openFDA). The number mostly reflects how popular Gravel root is, not how risky it is. A report is not proof Gravel root caused anything. It is a signal of what to watch for, nothing more.
Source: openFDA adverse-event reports. Voluntary reporting, not an incidence rate.
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.