It is often said that consuming coffee can trigger rosacea. However, this might not be entirely accurate: coffee may actually have benefits against rosacea. According to a study conducted by Wen-Qing LI, it has been demonstrated that the consumption of caffeinated beverages is associated with a dose-dependent reduction in the risk of rosacea. The overall risk of rosacea decreased by 132 per 100,000 person-years for the highest caffeine consumption compared to the lowest caffeine consumption, and by 131 per 100,000 person-years for the consumption of caffeinated coffee of four servings per day or more compared to less than one serving per month.
One explanation is the effect of caffeine, the main compound in coffee, on vascular contractility. Vasodilation has been observed in the pathogenesis of rosacea, and caffeine is known to cause vasoconstriction by acting on the renin-angiotensin-aldosterone system. The intake of caffeine could then reduce vasodilation and, consequently, reduce the symptoms of rosacea. Moreover, it has been proven that caffeine contains antioxidants and has immunosuppressive effects, which can lead to a reduction in inflammation in rosacea. Finally, it has been demonstrated that hormonal elements play a role in the development of rosacea and that caffeine can influence hormone levels, such as adrenaline, noradrenaline, and cortisol.
Additional analyses have shown that increased caffeine consumption from sources other than coffee (such as tea, soda, and chocolate) was not significantly associated with a reduced risk of rosacea. Furthermore, decaffeinated coffee did not show a positive association with the risk of rosacea, suggesting that ingredients other than caffeine may be at play. One potential ingredient is the polyphenol found in coffee. Polyphenols have antioxidant, anti-inflammatory, and vascular effects, and they have been found to be beneficial in the treatment of rosacea, particularly for facial erythema, papules , and pustules.
However, studies on the subject are limited.