Is Insulin useful for allergy?

Insulin is primarily a hormone for blood glucose regulation and is not used to treat allergies. Allergic reactions are mediated by histamine, mast cells, and IgE antibodies, not by insulin. There are no clinical guidelines or randomized controlled trials recommending insulin as a therapy for allergies. Some preclinical work suggests possible immunomodulatory effects of insulin on inflammatory pathways, but these are speculative and not applicable to allergic conditions. The evidence is purely mechanistic, based on cell or animal models, without human confirmation. Moreover, improper use of insulin can cause hypoglycemia. For allergy sufferers, effective and safe treatments such as antihistamines, corticosteroids, or immunotherapy are available. Therefore, insulin is not useful for allergies and should not be used without medical supervision. The claim that insulin can alleviate allergies lacks a solid scientific basis.