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L-Cysteine
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L-Cysteine

L-Cysteine, often derived from duck feathers or human hair, can trigger IgE-mediated allergy in sensitive individuals. Symptoms include urticaria, angioedema, or asthma. Rare but documented in occupational or high-exposure settings (e.g., bakery workers).
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L-Cysteine

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Symptoms

  • Skin rash
  • Hives
  • Itching
  • Swelling
  • Nausea
  • Vomiting
  • Diarrhea
  • Abdominal Pain
  • Difficulty Breathing
  • Anaphylaxis

Healing & Prevention

  • Avoidance
  • Antihistamines
  • Epinephrine Auto-Injector
  • Topical corticosteroids
  • Hydration
  • Medical Consultation
  • Allergy Testing
  • Emergency Action Plan
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