Pellitory (Parietaria officinalis), also known as wall pellitory, has a history of traditional use in herbal medicine, particularly in Europe. Historically, it has been used for a variety of ailments, including those related to the respiratory tract, such as sinus issues, coughs, and catarrh. The plant contains flavonoids, tannins, and other phytochemicals, and traditional herbalists have recommended it for its purported diuretic, soothing, and mild anti-inflammatory properties. In the context of sinus health, pellitory has been used in folk remedies as a tea or infusion to help relieve congestion and support respiratory comfort.

However, scientific validation for these uses is minimal. There are very few clinical or pharmacological studies specifically examining the effects of pellitory on the sinuses or its ability to support sinus health. Most references to its use are found in herbal compendia or traditional medicine texts, rather than in peer-reviewed scientific literature. Therefore, while there is a basis for its use rooted in tradition, there is insufficient scientific evidence to strongly support its efficacy for the sinus body system.

In summary, pellitory's association with sinus support is primarily traditional, with little to no robust scientific evidence confirming its effectiveness for this purpose.