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Most users do well with 6mm needles, which penetrate deep enough to reach subcutaneous fat but not so deep as to risk intramuscular injection in typical sites

Although results can vary from person to person, multiple injections are required to achieve optimal results

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Sharon Chinthrajah, an associate professor of medicine and pediatrics at and acting director of the Sean Parker Center for Allergy and Asthma Research at Stanford University, noted that Xolair is not a cure, and patients still need to avoid the foods they are allergic to