The invention discloses a composition which is formed by combining
plant materials and has functions of nourishing yin and reducing blood glucose, and a preparation method of the composition. The blood-glucose-reducing composition comprises cortex lycii radicis, fruit of Chinese wolfberry, glossy
privet fruit, radix polygonati
officinalis, Chinese yam,
radix ophiopogonis and
semen cassia; the yin-nourishing and blood glucose-reducing composition disclosed by the invention can be prepared into any normal internally-taken
dosage form, is remarkable in
curative effect for treating and preventing
diabetes mellitus, and has total effective rate of over 90% for
diabetes mellitus; moreover, after
drug withdrawal, the
impaired fasting glucose or blood glucose does not rebound two hours after the
meal. The yin-nourishing and blood-glucose-reducing composition disclosed by the invention is small in
side effect, has effects of tonifying
spleen and reinforcing the kidneys, nourishing yin and tonifying yang, mediating internal organs and the like, treats both symptoms and root causes; after entering the body, the
drug can promote
islet cells to reproduce, can strengthen
secretion of
insulin, can improve glucose
metabolism in the body, and has good prevention and
treatment effect on various syndromes caused by diabetes.