Research review
Does slippery elm tea have caffeine?
Slippery elm bark itself doesn't contain caffeine — it isn't from the tea plant. A slippery elm tea product only has caffeine if another caffeinated ingredient is blended in, so the label's ingredient list is what actually answers this.
The evidence doesn't support slippery elm tea as reliably caffeine-free just because it's called "tea" — slippery elm bark itself has no caffeine, but a blended product might. It also doesn't support any tested interaction between the two if a blend does contain both. Here's the actual composition question, and what's separately known about caffeine.
What the evidence doesn't support
It doesn't support slippery elm bark as a source of caffeine — no research or plant chemistry connects Ulmus rubra to caffeine content, and none should be expected in a single-ingredient slippery elm product. It doesn't support a general assumption that "tea" means caffeinated, since herbal tisanes (including slippery elm) commonly use the word "tea" without containing tea leaf. And it doesn't support any tested effect, positive or negative, of combining slippery elm with caffeine — no trial has looked at the pairing.
What the trials found
Slippery elm bark comes from a North American elm tree, unrelated botanically to Camellia sinensis (the tea plant) or the coffee plant, and no study or food-composition source identified for this page reports caffeine in slippery elm bark itself. A "slippery elm tea" product only contains caffeine if a separately caffeinated ingredient — black tea, green tea, yerba mate — is blended into it; the ingredient list, not the word "tea," is what actually answers the question for a given product.
Caffeine's own gastrointestinal effects are a separately studied area. A 2022 narrative review of coffee research found that coffee stimulates gastric acid secretion and colonic motility, among other digestive effects — a review of coffee as a whole (which contains caffeine along with many other compounds), not a study isolating caffeine by itself. That's a stimulant-type mechanism, working through acid secretion and gut motility, which is a different mechanism from slippery elm's demulcent effect — mucilage physically coating tissue it contacts. No trial has tested what happens when the two are combined in the same product or the same sitting.
Questions people ask
Does slippery elm tea have caffeine?
Not from the slippery elm itself. If a product is pure slippery elm bark, it has no caffeine; if it's blended with black tea, green tea or another caffeinated ingredient, check the label — the caffeine comes from that ingredient, not the bark.
Can I drink slippery elm tea and coffee together?
No study has tested this combination specifically. Slippery elm's mucilage-coating mechanism and caffeine's stimulant effects on the gut work through entirely different pathways, and nothing reviewed for this page measures what happens when both are present at once.
When to talk to a doctor
If caffeine causes digestive discomfort for you specifically, that's worth raising with a doctor rather than assuming a slippery elm product will offset it — slippery elm is not a treatment for caffeine sensitivity or any digestive condition, and nothing in the research reviewed for this page supports using it that way.
Related reading: slippery elm tea: how to make it and what it does and what is slippery elm?.
Sources
- Chemical constitution of slippery elm mucilage; isolation of 3-methyl d-galactose from the hydrolysis products Slippery elm's mucilage is a polysaccharide built from several sugars, including 3-methyl-D-galactose — the chemical basis for the gel it forms in water.
- Effects of Coffee on the Gastro-Intestinal Tract: A Narrative Review and Literature Update A 2022 narrative review of coffee research found coffee stimulates gastric acid secretion and colon motility, among other digestive effects — a review of coffee broadly, not of caffeine in isolation.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.