← Genes & pathways

Gene & pathway reference · FROM DR. PURSER’S TEACHING

IL4

IL4 encodes interleukin-4, a cytokine involved in Th2 immune responses and antibody class switching, including pathways related to IgE. It operates alongside IL-5 and IL-13 rather than representing all allergic biology by itself.

Based on teaching by Dan Purser, MD. How we prepare these guides

Updated Sep 23, 2026 · Educational reference

THE TEACHING CONNECTION

Th2 signaling and allergic patterns

Th2 signaling and allergic patterns

IL4 encodes interleukin-4, a cytokine involved in Th2 immune responses and antibody class switching, including pathways related to IgE. It operates alongside IL-5 and IL-13 rather than representing all allergic biology by itself.

Putting the pieces together

Dr. Purser’s panel connects IL-4 with allergic and food-reaction contexts and discusses vitamin D as part of that picture. The helpful distinction is between confirmed allergy, a reproducible food-associated symptom and a genetic association. Vitamin D status requires a measurement rather than inference from IL4.

Where the VARS Triad and MTHFR Daily fit

If you are exploring homocysteine or cytokines, Dr. Purser may discuss MTHFR Daily and the VARS Triad: VARS Glutathione, VARS SOD, and VARS Catalase. He gives glutathione a central place in his approach to antioxidant support.

A gene result alone cannot tell you that you need these products or that they will treat a condition. Review your current results, medicines, goals, and tolerance with your clinician before choosing a product or dose.

A question to bring to your visit

Are my reactions consistent with an allergy, and has vitamin D status actually been measured?

Variant lookup

These names can help you find an entry on your original genetic report. Seeing a name here does not tell you whether it affects your health or whether you need treatment.

rs2243250

Names you may see

IL-4 · Interleukin 4

Now hear the conversation.

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