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From the website of the American Association of Clinical Endrocrinologists:
Parenteral Testosterone Preparations
Testosterone enanthate and testosterone cypionate are long-acting testosterone esters suspended in oil to prolong absorption. Peak levels occur about 72 hours after intramuscular injection and are followed by a slow decline duringthe subsequent 1 to 2 weeks (49). For complete androgen replacement, the regimen should be between 50 and 100 mg of testosterone enanthate or cypionate administered intramuscularly every 7 to 10 days, which will achieve relatively normal levels of testosterone throughout the time interval between injections (50). Longer time intervals are more convenient but are associated with greater fluctuations in testosterone levels. Higher doses of testosterone produce longer-term effects but also higher peak levels and wider swings between peak and nadir circulating testosterone levels; the result is fluctuating symptoms in many patients (51). The use of 100 to 150 mg of testosterone every 2 weeks is a reasonable compromise. Use of 300-mg injections every 3 weeks is associated with wider fluctuations of testosterone levels and is generally inadequate to ensure a consistent clinical response. With use of these longer interval regimens, many men will have pronounced symptoms during the week preceding the next injection. In such instances, a smaller dose at closer intervals should be tried. As a guide, testosterone levels should be above the lower limit of normal, in the range of 250 to 300 ng/dL, just before the next injection (52). Excessive peak levels and side effects should also be monitored and used to adjust the dosing regimens.
So they want you to dip down to the low end before every shot. Crappy protocol if you ask me. 25-50mg 3x week would be preferred. Or at least twice a week. I cringe at the once every two weeks protocol. Far to long between shots IMO. Of course I am no endo but this is what has worked better for me.