Vitamin C
Among a long list of health benefits of vitamin C, it has been shown in many controlled clinical trials to reduce the severity of symptoms of the common cold.
Quercetin
Quercetin is a bioflavonoid that acts as an antihistamine and has anti-inflammatory properties. It has also been shown to inhibit certain chemicals that typically affect the sinus and respiratory tract. Quercetin also enhances the affect of vitamin C.
Bromelain
Derived from the pineapple plant, bromelain has proven mucolytic properties. The anti-inflammatory effect of bromelain is the probable reason this enzyme has been found effective for people suffering from sinusitis. Bromelain also enhances the absorption of quercetin.
N-acetyl-l-cysteine (NAC)
NAC helps break down mucus. Double-blind research has found that NAC supplements improved symptoms and prevented recurrences in people with chronic bronchitis. NAC may also protect lung tissue through its antioxidant activity.
Elder
Elderberry has long been a traditional remedy for colds and fever, as it may improve flu-like symptoms, such as fever, fatigue, headaches, sore throat, cough and aches.
Stinging nettle
From ancient Greece to the present, nettle has been documented for its traditional use in treating coughs, achy joints, and supporting the nasal passageways.
Andrographis
Andrographis has a long history in traditional Indian and Chinese medicine. Several double-blind clinical trials have found that andrographis can help reduce symptom severity in people with common colds.
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Wellness Advisor