Synopsis

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

A "vegetable blend (proprietary)" is sometimes marketed in dietary supplements for cold prevention and immune support. The use of vegetables and their extracts for general health has a long tradition in various cultures, where diets rich in vegetables are associated with better immunity and overall health. Traditional medicine systems, such as Ayurveda and Traditional Chinese Medicine, have used certain vegetables for centuries to support the body's defenses against illness, including colds. Common vegetables like garlic, onion, ginger, and certain leafy greens have specific historical uses for their perceived immune-boosting properties. However, the term "vegetable blend (proprietary)" is vague and does not specify which vegetables are included, nor their concentrations.

Scientifically, while individual vegetables may contain vitamins, minerals, and phytochemicals that support immune function (such as vitamin C, polyphenols, and antioxidants), there is limited direct evidence that proprietary vegetable blends, as a category, prevent colds. Most studies focus on overall fruit and vegetable consumption rather than isolated blends. Therefore, while the traditional use of vegetables in immune support is established, and a diet high in vegetables is linked to a lower risk of many illnesses, robust clinical trials supporting specific proprietary blends for cold prevention are lacking. As such, the evidence rating for this use is moderate (2), reflecting tradition and some indirect scientific plausibility, but not direct clinical validation for proprietary blends.

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