My friend Rade says the mulberry fruit (черница) not only makes a
good jam, but is also good for stomach problems. It can be white,
black, or red.
Traditionally, in China mulberry fruit has been used as a medicinal
agent to nourish the yin and blood, benefit the kidneys, and treat
weakness, fatigue, anemia, and premature graying of hair. It is also
used utilized to treat urinary incontinence, tinnitus, dizziness, and
constipation in the elderly and the anemic.
In China silk worms feed on the mulberry and often
flies will lay eggs in the mulberry fruit.
http://www.itmonline.org/arts/morus.htm