Bayberry pollen extract is allergenic, and the Southern bayberry tree fulfills Thommen’s criteria defining aeroallergen-producing plants.
– J Allergy Clin Immunol 1992 Sep;90(3 Pt 1):312-8 — Nasal and bronchial provocation challenges with bayberry (Myrica cerifera) pollen extract. — Jacinto CM, Nelson RP, Bucholtz GA, Fernandez-Caldas E, Trudeau WL, Lockey RF

May cause allergic reaction similar to hay fever.
– Hay fever from Southern Wax-Myrtle (Myrica cerifera): a case report. — Prince HE, et al. — Ann Allergy. 1977 Apr;38(4):252-4.

Not recommended if you are pregnant or nursing.

May cause gastrointestinal distress. Use caution if you have a digestive disorder.