Hi,
Allergy desensitization is very effective for
allergies to pollen, mites, cats, and especially stinging insects such as bees, hornets, yellowjackets, wasps, velvet ants, and fire ants. Allergy immunotherapy usually takes 6 months to a year to become effective and injections are usually required for 3-5 years.
If you will be given immunotherapy to garlic antigen, there is no proven effectivity to garlic odor allergy. Avoidance of the said odor is the only treatment for now.