Hibiscus tea may help lower blood pressure in individuals with mild hypertension or type 2 diabetes, according to a study conducted at the Yazd Diabetes Research Center. However, as of 2015, there is no conclusive evidence that it can be a legitimate treatment for primary hypertension.
Like many teas, hibiscus tea helps boost the immune system, helping to prevent colds and the flu, explains Organic Facts. Hibiscus tea also has some known side effects. People with hypotension (very low blood pressure), pregnant women and people on certain medications should avoid drinking hibiscus tea, notes SFGate. As always, those interested in alternative or supplementary treatments should discuss them with a doctor first.