Anaphylactic shock is an allergic reaction to the presence of a foreign protein in the body. It most commonly occurs when an individual has an allergy to things like a specific medication (such as penicillin), insect bites, chemicals, foods, food additives/preservatives. With this sometimes-fatal disorder the smooth muscles are stimulated to contract, which may restrict a person’s breathing. This reaction is not really seen with hormonal products like anabolic steroids, but with counterfeits and low production values of these independent underground labs it may.