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Vervain Side Effects, Interactions and Warnings

  • Vervain supplies variable quantities of vitamin K and can lessen the effect of oral anticoagulant therapy.
    - Oral anticoagulants and medicinal plants. An emerging interaction -- Argento A, Tiraferri E, Marzaloni M. -- Ann Ital Med Int. 2000 Apr;15(2):139-43.

  • Vervain can reduce iron absorption.
    - Br J Nutr 1999 Apr;81(4):289-95 -- Inhibition of non-haem iron absorption in man by polyphenolic-containing beverages. -- Hurrell RF, Reddy M, Cook JD.

  • May cause allergic skin reactions.
    - Contact Dermatitis 1994 Sep;31(3):200-1 -- Allergic contact dermatitis from Verbena officinalis L. -- Del Pozo MD, Gastaminza G, Navarro JA, Munoz D, Fernandez E, Fernandez de Corres L.

  • Should not be taken during pregnancy unless it is recommended by a herbalist and your physician.
    - McGuffin M, Hobbs C, Upton R, Goldberg A (eds). -- American Herbal Products Association’s Botanical Safety Handbook. Boca Raton, FL: CRC Press, 1997.

last update: March 2014

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