Slippery elm is sometimes used as a therapy in inflammatory bowel disease and should be used with caution. Consult with you physician.
– Aliment Pharmacol Ther 2002 Feb;16(2):197-205 — Antioxidant effects of herbal therapies used by patients with inflammatory bowel disease: an in vitro study. — Langmead L, Dawson C, Hawkins C, Banna N, Loo S, Rampton DS.

The effect on pregnant or nursing women is unknown and should be used with caution.

May cause an internal or external allergic reaction.