Fruit and vegetable blends are often included in supplements to support various aspects of health, including the mucus membranes. The justification for their use in this context is primarily scientific, albeit with moderate evidence. Mucus membranes line various passages in the body (like the respiratory, digestive, and genitourinary tracts) and play a critical role in immune defense and barrier function. Scientific studies have shown that fruits and vegetables are rich sources of vitamins (such as vitamin A, vitamin C, and certain B vitamins), minerals, polyphenols, and carotenoids, all of which contribute to the maintenance and repair of epithelial tissues, including mucus membranes.

Vitamin A is particularly notable for its role in maintaining the integrity and function of epithelial cells, which make up mucus membranes. Vitamin C supports collagen synthesis and immune function, both important for mucosal health. Polyphenols and other antioxidants found in a variety of fruits and vegetables can help reduce oxidative stress and support tissue repair mechanisms. Some clinical studies suggest that diets high in fruits and vegetables are associated with better mucosal health and reduced risk of conditions affecting these tissues (e.g., oral mucositis, respiratory tract infections).

However, most studies focus on whole food intake rather than proprietary blends, and evidence specifically supporting the efficacy of concentrated blends or extracts for mucus membrane health is limited. Therefore, the evidence is rated as moderate (3 out of 5).