Which one? Tropical south african big flower one or rose of sharon?
My mom is a natural pathic doctor and nutritionist, she has all sorts of knowledge on natural remedies and plants and stuff. Not too certain what the breakdown for torts is but its very very healthy for humans. Heres a pretty cool article http://www.gaiaherbs.com/articles/detail/42/The-Surprising-Health-Benefits-of-Hibiscus
According to Purdue University, 100 g of dried hibiscus fruit contains: 49 calories; 1.9 g protein; 0.1 g fat; 12.3 g total carbohydrate (2.3 g fiber); 1.72 mg calcium; 57 mg iron; 300 mg beta-carotene; 14 mg ascorbic acid (vitamin C); and two anthocyanins, gossipetin and hibiscin."