The use of a Fruit & Vegetable Blend to support the muscular system has some scientific basis, but the evidence is limited and indirect. Fruits and vegetables are rich in vitamins, minerals, antioxidants, and phytonutrients that generally promote health, including muscle health. For example, nutrients such as vitamin C (found in many fruits and vegetables) are essential for collagen synthesis, which supports connective tissues. Potassium (abundant in foods like bananas and spinach) is vital for muscle contraction and function. Antioxidants from fruits and vegetables may also help mitigate oxidative stress that can damage muscle tissue during intense exercise.

However, most scientific studies examine the effects of specific nutrients or whole food consumption, rather than proprietary "blends" or supplements. There is some evidence that higher intake of fruits and vegetables correlates with better muscle function and reduced risk of age-related sarcopenia (muscle loss), but these findings are mostly observational. Few randomized controlled trials directly test the efficacy of fruit and vegetable blends on muscle strength, mass, or recovery in healthy individuals. The American College of Sports Medicine recommends a balanced diet rich in vegetables and fruits for athletes, but does not specifically endorse blends or supplements for muscle support.

In summary, while individual components of fruit and vegetable blends are important for muscle health, direct evidence for blends as a unique intervention is limited. The rating reflects modest scientific support, largely based on the general benefits of fruits and vegetables rather than blend-specific research.