Rosella has been used as a therapeutic plant for centuries.
The flowers contain 260-280 mg of vitamin C, vitamin D, B1 and B2 in each 100 grams.  Rosella tea itself contains very high calcium, approximately 486 mg per 100 grams.  It also contains Magnesium, Omega 3, Vitamin A, Iron, Potassium, Beta Carotene and Essential Acids. 
 In traditional medicine, Rosella is known to increase stamina and endurance, help with detoxification (neutralizing poison) as well as lowering blood pressure, blood sugar levels, uric acid and cholesterol in the body.  Helps to treat a cough, sore throat and canker sores, yet can also soothe a migraine.  
Ex-smokers benefit from drinking rosella tea, as it can reduce the negative impact of nicotine and reduce dependence on drugs.