It is normal for your immune system to weaken with age. Luckily, you can shift your health back into high gear by bolstering your defenses against everything from colds and the flu to salmonella just by heading outdoors on sunny days.
It works! When the blue rays in sunlight hit your skin, they energize your immune cells, making your body more effective at thwarting harmful invaders. Also wearing sunscreen doesn't block the effect!
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