We did this for our son (peanuts and cashews) and it was also life changing. He’s on a daily maintenance dose for life, but we no longer fear the possibility of either allergen being near him in public places or cross contamination in food. He still has to carry his epipen, but now the prognosis for “oops he ate something with peanut in it” is no reaction at all until he’s several peanuts in. He’s not cured and can still eat his way to anaphylaxis with a bag of peanuts, but he can take a few bites out of a PB&J sandwich and nothing will happen.

One detail in particular makes a huge difference: oral immunotherapy seems to be significantly more effective in babies (starting before age 2) with significantly better outcomes. Adults and young children have a much higher incidence of side effects (most common one is a constantly upset stomach) that makes avoidance potentially still better for overall quality of life, but our allergist told us that among their <2 year old cohorts they’ve seen zero out of [upper two digits] experience any of those side effects at all. We started our son when he was 1 year old.

In our case the kid started eating peanuts basically as soon as they started eating solid foods, so the allergy happened despite early exposure. Actually we caught the allergy early enough to start OIT early because of early exposure.