Myths vs facts: FT3 and Allergie

The claim that free T3 (FT3) directly causes or cures allergies is not supported by strong evidence. FT3 is a thyroid hormone primarily regulating metabolism, not the allergic cascade (IgE, mast cells, histamine). Some research suggests thyroid hormones can modulate cytokine profiles, but this is not a proven causal link to allergic diseases. MyBody-X does not offer a specific FT3 test; their products (e.g., Medi Check, hormone tests) are lifestyle tools, not clinical diagnostics. A single FT3 value from such a test cannot explain or treat allergies. For genuine allergy symptoms, specific IgE testing and medical evaluation are required. The evidence for an FT3–allergy connection is weak, resting on mechanistic speculation rather than robust human trials. Be wary of marketing that presents FT3 as an 'allergy marker' – it is misleading. Safety note: Do not adjust thyroid medication based on home test results.