Allergena - Allergy Relief Drops Zone?5 - 1 oz. (30 mL) Allergena Allergy Relief Drops Zone?5 provides natural allergy relief for Kansas, Oklahoma and Texas. This allergy relief supplement may be taken sublingual which is underneath the tongue, or as immunotherapy. Immunotherapy is treatment to stimulate or restore the ability of the immune (defense) system to fight infection and disease. Allergy shots are another form of Immunotherapy. The immune system defends people against disease. When