Synopsis

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

Vitamin C (ascorbic acid) has been investigated for its potential role in supporting respiratory allergies due to its antioxidant properties and effects on immune function. Some scientific studies suggest that Vitamin C can help reduce histamine levels in the blood, which may alleviate allergy symptoms such as sneezing, nasal congestion, and wheezing. For example, a small number of clinical trials and observational studies have shown that Vitamin C supplementation may modestly reduce symptoms of allergic rhinitis and asthma. One study found intravenous Vitamin C reduced allergy-related symptoms in some patients, while oral supplementation appeared to have a minor but positive effect in others.

However, the evidence is mixed and not robust; most studies are limited by small sample sizes, short durations, or methodological limitations. Major health organizations do not currently recommend Vitamin C as a primary or standalone therapy for respiratory allergies. Its use is generally considered adjunctive and supportive rather than curative.

In summary, while there is some scientific rationale and preliminary evidence supporting the use of Vitamin C in managing respiratory allergies, the overall quality and consistency of the evidence are low, justifying a modest evidence rating. More rigorous and larger clinical trials are needed to establish definitive benefits.

More about Vitamin C (mixed)
More about Allergies (respiratory)

Other ingredients used for Allergies (respiratory)

Other health conditions supported by Vitamin C (mixed)

Products containing Vitamin C (mixed)