Evidence supporting the use of: Bacteria (unspecified)
For the body system: Sinuses

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Bacteria, specifically in the form of probiotics, have been investigated for their potential to support the health of the sinuses and upper respiratory tract. Several studies suggest that oral probiotics can help modulate immune responses and may reduce the frequency or severity of upper respiratory tract infections (URTIs), which often involve the sinuses. Probiotic strains such as Lactobacillus and Bifidobacterium have received the most attention in this context. Clinical trials have shown mixed results: some indicate a reduction in the incidence or duration of symptoms related to sinusitis and the common cold, while others show minimal effect. The mechanism is thought to involve both direct interactions with the mucosal immune system and indirect modulation of systemic immunity.

There is emerging interest in the concept of a "sinonasal microbiome," and early-stage research explores the potential role of local (nasal) probiotic application. However, most human studies to date rely on oral supplementation and focus on general upper respiratory health rather than sinus health specifically. While promising, the evidence is not fully conclusive; many studies are small, with variable methodologies and probiotic strains. Thus, there is moderate scientific support (rated 3/5) for the use of certain probiotics (bacteria) to support sinus health, primarily through immune modulation, but more robust and targeted clinical trials are needed.

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