Study shows melatonin, commonly used to improve sleep, can aggravate bowel inflammation (Worsens colitis by hurting gut bacteria)

Medical Xpress / FAPESP / Microorganisms ^ | May 9, 2023 | Ricardo Muniz / Jefferson Luiz da Silva et al

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“I wonder if it impacts the urinary tract, too, that would make UTIs an issue.”

I did some research online, and it appears that melatonin can have negative effects on the bladder, including causing UTIs.