Testosterone boosting effects in rats have been noted at a dosage of 200mg/kg of a 40% extract (80mg/kg Icariin), and based on body weight conversions from rats to humans^[1] this results in an estimated human dose of:

• 900mg Icariin for a 150lb person
• 1,200mg Icariin for a 200lb person
• 1,500mg Icariin for a 250lb person

Studies that use a lower dosage of Icariin (1-10mg/kg) are approximately equal to:

• 11-110mg Icariin for a 150lb person
• 15-150mg Icariin for a 200lb person
• 18-180mg Icariin for a 250lb person

The human study on postmenopausal women and bone health noted that 60mg Icariin daily was active, and might serve as the lowest active dose currently known. It also appears to fall within the above range of lower active dosages which show benefits in rats.