Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Vitamin C (ascorbic acid) has been investigated for its potential role in supporting the sinuses, primarily in the context of upper respiratory tract infections, including the common cold and sinusitis. The underlying rationale is that Vitamin C is an antioxidant and can support immune function, thereby potentially reducing the severity or duration of infections that affect the sinuses. Some traditional recommendations and over-the-counter products include Vitamin C for this reason.

However, scientific evidence for Vitamin C specifically improving sinus health or directly benefiting sinusitis is limited. Meta-analyses such as those by Hemilä and Chalker (Cochrane Database, 2013) have shown that regular Vitamin C supplementation may slightly reduce the duration and severity of common cold symptoms, but not the incidence. Since many sinus problems arise from viral infections like the common cold, this is sometimes extrapolated to mean sinus support. Direct clinical trials targeting sinusitis or sinus health specifically, however, are sparse and results are inconclusive.

In summary, there is some scientific validation for the use of Vitamin C in supporting general upper respiratory health and potentially reducing the duration of cold symptoms, which may incidentally benefit the sinuses. However, the evidence is not robust or specific for sinus health, so the strength of recommendation remains low.

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