What role does Homocystein play in Allergie?

Homocysteine is a sulfur-containing amino acid produced during methionine metabolism. Elevated homocysteine (hyperhomocysteinemia) is associated with inflammation and oxidative stress. Regarding allergies, mechanistic studies suggest homocysteine may modulate immune responses—for example, by promoting Th2 cytokine profiles or activating mast cells. However, clinical evidence for a direct role in allergic conditions like hay fever or asthma is weak and inconsistent. Most data come from in vitro or animal models; large epidemiological studies do not show a robust association. A causal link remains unproven. MyBody-X tests do not routinely include homocysteine; if measured, results should be interpreted alongside B-vitamin status and kidney function. Homocysteine alone is not useful for allergy diagnosis or management. Evidence: mechanistic; no direct human studies on allergies.