It never used to be that way.  And no one in the scientific community seems to know why that is.

The Treatments
In 2018, without addressing the cause, the Centers for Disease Control and Prevention (CDC) wanted you to roll up your sleeve to be injected with a new 'peanut allergy vaccine' based on research in mice, using immunotherapy to alter the immune system's response to prevent peanut allergies.

"By redirecting the immune responses, our vaccine not only suppresses the response but prevents the activation of cells that would initiate allergic reactions." – Jessica O'Konek, Ph.D.

The vaccine concept had been repurposed. While the original vaccine model was designed to trigger the immune system to recognize the invaders and mount an efficient defense the next time the invaders returned, vaccinating against allergens "requires teaching the immune system to ignore these proteins."

Allergy immunotherapy sounds very similar to allergy shots first introduced in 1911 where small doses of inhaled allergens are given over the course of many years. Allergy shots do not work on food allergens so why reinvent a broken wheel? The 'original wheel'  (that vaccines attempt to mimic) is Homeopathy, developed in 1796 based on the doctrine of 'like cures like'. Homeopathy and other holistic modalities trust the body to heal itself if given natural tools.

In 2023, doctors introduced a new desensitization therapy called sublingual immunotherapy, or SLIT. Side effects included a temporary itch in the mouth. Researchers said SLIT was not a cure.

Also in 2023, inspired by the COVID-19 vaccine, the mRNA nanoparticle "treatment' for peanut allergies was tested on mice. The mRNA payload to encode the selected peanut protein fragment was the same method used to encode the "spike protein" of the SARS-CoV-2  protein fragment). Mice that were pre-treated showed less of a reaction to peanuts, so say the researchers. With no positive breakthroughs, they expect to move forward with trials and apply the same treatment in many other diseases.