Generate a banner background in soft and vibrant shades of blue, symbolizing the regeneration of the human immune system. Infuse the design with abstract graphic elements representing healthy cells and revitalization. Consider adding subtle blue gradients to create a harmonious transition. Integrate soothing accessories, such as images of mint leaves or gentle swirls, that evoke relief for the digestive system. Include hints of light or patterns suggesting renewal and strengthening of both the immune and digestive systems. Convey a sense of well-being and optimism in the composition. This background will serve as the foundation for a banner emphasizing products that provide immune support and digestive relief.