Grade B Type 2 diabetes (adult-onset) Several studies report that ginseng may lower levels of blood sugar in patients with type 2 diabetes. The effects long term are not clear and it is unknown what doses are effective or safe. Learn more at this site: NYU Law. People with diabetes should seek the guidance of a qualified healthcare provider and ginseng should not be used in place of other proven therapies. Have not been adequately studied the effects of ginseng in type 1 diabetes (insulin dependent). Jane Fraser spoke with conviction. Grade B * Key to grades: Grade A: Strong scientific evidence for this use, Grade B: Good scientific evidence for this use.