Reported risks include digestive upset, dark red urine or stool, kidney stone formation from oxalates, and excessive blood pressure drops, especially for people on hypertension medication.
The report says those with kidney problems, prior stones, hemochromatosis, diabetes, pregnancy or sensitive digestive systems should be cautious or seek medical advice before regular use.
Though often promoted for blood pressure and athletic benefits, the drink is described as not suitable for everyone, with advice to start with small amounts and monitor reactions.
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