Avoid with known allergy or sensitivity to flaxseed, flaxseed oil, its parts, or any other members of the Linaceae plant family.
Allergic reactions to flaxseed and flaxseed powder have been reported. Itchy palms, hives, itchy eyes and weeping, nausea, and vomiting after consuming flaxseed oil was reported in one case. In another case, a man experienced 5-6 episodes of intestinal and stomach pain, vomiting, diarrhea, hives, shortness of breath, watery discharge, sneezing, stuffy nose, itching, and generally felt unwell after eating bread containing flaxseed.
Anaphylaxis (severe allergic reaction) has also been reported.