slippery elm bark
Plant that can be a good skin-soothing agent but can also be an allergen if used in high amounts.
Reference for this information:
The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999
PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998
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