Immune system affirmations are positive statements intended to boost one's immune system by promoting a positive mindset and reducing stress. The idea is that by repeating these affirmations, individuals can influence their mental state, which in turn might have a beneficial effect on their physical health. While there's no direct scientific evidence that affirmations can strengthen the immune system, reducing stress and promoting a positive mindset can contribute to overall well-being, which may indirectly support immune function.