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J Altern Complement Med. 2002 Jun;8(3):309-14.

CordyMax Cs-4 improves glucose metabolism and increases insulin sensitivity in normal rats.

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  • 1Pharmanex Beijing Clinical-Pharmacology Research Center, China.



To evaluate effects of CordyMax trade mark Cs-4, a mycelial fermentation product of Cordyceps sinensis, on improving glucose metabolism and insulin sensitivity.


An in vivo pharmacology study. Subjects and Study Interventions: Adult Wistar rats, male and female, were given CordyMax 250 or 500 mg/kg per day or placebo for 17 days by gavage.


Fasting blood glucose, fasting plasma insulin, glucose-insulin index, and oral glucose tolerance.


Rats fed Cs-4 at either 250 or 500 mg/kg showed significantly reduced fasting blood glucose after the 17-day treatment, by 27% and 24% from baselines respectively (both p < 0.001). Examination of fasting plasma insulin demonstrated a 37% decrease in the high dose treatment groups (p = 0.012). Glucose-insulin index, an index of insulin sensitivity, increased by 10% and 17% in both 250 and 500 mg/kg groups (p = 0.008 and p = 0.0001, respectively). Oral glucose tolerance tests showed significantly improved glucose tolerance at 0.5, 1.0, and 2.0 hours after oral administration of a bolus of glucose (the area under the glucose curve: p = 0.05-0.006), but no change at 5 hours.


CordyMax Cs-4 is effective in lowering basal blood glucose and plasma insulin, improving glucose metabolism by enhancing insulin sensitivity, and improving oral glucose tolerance.

[PubMed - indexed for MEDLINE]
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