For most healthy adults, beetroot juice is a safe and easy addition to the day, and any side effects tend to be mild and short-lived. Still, a few things are worth knowing so nothing catches you off guard.
The most famous quirk is beeturia — pink or red urine (and sometimes stool) after eating beets. It looks alarming the first time, but it is completely harmless, affecting roughly 10 to 14% of people simply because their bodies excrete the beet's colorful pigments rather than fully breaking them down, as explained in clinical references from the National Center for Biotechnology Information. It is not blood, though any unexplained, persistent color change is always worth mentioning to your doctor.
A more meaningful caution involves kidney stones. Beets are a high-oxalate food, and guidance from the National Kidney Foundation advises people prone to calcium-oxalate stones to be mindful of high-oxalate foods, stay well hydrated, and pair them with adequate dietary calcium rather than cutting out plants entirely. If you have a history of stones, it is wise to talk with your clinician before making daily beetroot juice a habit. Similarly, because the juice can lower blood pressure, anyone taking blood-pressure or nitrate medications should check in with their doctor first, so the effects do not stack up unexpectedly.
Finally, a bit of perspective: beetroot juice works best as one part of an overall vegetable-rich pattern, the kind championed by the DASH eating plan for heart health. This article is educational and not a substitute for personal medical advice — for anything specific to your health, your clinician is the right guide.