Traditionally mulberry leaf is used for the lungs, liver function and eyesight but Mulberry leaf is rich in amino acids, vitamin C and antioxidants.
The latest Chinese research has shown Mulberry leaf is effective in regulating blood fat, balancing blood pressure, reducing blood glucose, and boosting metabolism. It is taken to help reduce blood sugar levels. Mulberry leaf is also considered a wonderful herb for anti-inflammation, anti-aging and all-round maintaining health. It will also act, if applied both topically and taken internally, by decreasing melanin production and lightening pigmentation.
I steeped for 5 minutes at 100oC. and really enjoyed this drink, however, use this as a guideline and adjust according to your taste.
It goes without saying that if you're pregnant (or are under the doc for anything) caution should be exercised with herbal decoctions.