Parsley may increase the risk of bleeding or potentiate the effects of warfarin therapy.

– Am J Health Syst Pharm 2000 Jul 1;57(13):1221-7; quiz 1228-30 —
Potential interactions between alternative therapies and warfarin. — Heck AM, DeWitt BA, Lukes AL. — School of Pharmacy and Pharmacal Sciences, Purdue University, Indianapolis, IN, USA.

Possible internal reaction due to skin allergy.

Contact Dermatitis 1977 Apr;3(2):79-84 — Immediate reactions to fruits and vegetables. — Hannuksela M, Lahti A.

The bergapten content of garden parsley and its significance in causing cutaneous photosensitization.

– Clin Exp Dermatol 1985 Jul;10(4):328-31 — Zaynoun S, Abi Ali L, Tenekjian K, Kurban A.