Does caffeine slightly weaken the immune system?

Caffeine can enhance immune function through the release of adrenaline, especially when consumed in moderation. This is because adrenaline can help improve immune system function. For those frequently exposed to illness, such as healthcare workers or parents, engaging in activities that boost adrenaline, including drinking caffeinated beverages, may support immune health a few times a week 1.

Overall, caffeine's impact on the immune system depends on individual response and usage patterns. While caffeine itself is not typically known to directly weaken the immune system, consuming it in moderation and alongside other healthy behaviors, like exercise and good sleep, can support overall well-being.