Pellitory (commonly referring to Parietaria officinalis or Anacyclus pyrethrum, also known as Pellitory-of-the-wall or Spanish Pellitory) has a long history of use in traditional herbal medicine, particularly in European and Middle Eastern folk remedies. In traditional systems, Pellitory root was sometimes used for conditions affecting the respiratory tract, including the ears and throat. Some herbalists historically suggested its use for "earache" or to help "clear obstructions" in the head and Eustachian tubes, possibly due to its reputed warming and stimulating properties.

However, there is a lack of robust scientific studies specifically validating the use of Pellitory for supporting the Eustachian tubes or for addressing Eustachian tube dysfunction. Most evidence is anecdotal or comes from old herbal texts rather than controlled clinical trials. The constituent compounds of Pellitory, such as pellitorine, have been studied for other properties (for example, analgesic effects), but not directly for Eustachian tube health or function.

In summary, the use of Pellitory to support the Eustachian tubes is based on historical and traditional usage rather than scientific validation. There is insufficient clinical evidence to support its efficacy for this particular body system.