Testosterone peaks on day 7

Submitted by mr. drew on
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Fascinating study: serum testostone peaks 7 days after ejaculation.


A research on the relationship between ejaculation and serum testosterone level in men.

Jiang M, Xin J, Zou Q, Shen JW.


The purpose of this study is to gain understanding of the relationship between ejaculation and serum testosterone level in men. The serum testosterone concentrations of 28 volunteers were investigated daily during abstinence periods after ejaculation for two phases. The authors found that the fluctuations of testosterone levels from the 2nd to 5th day of abstinence were minimal. On the 7th day of abstinence, however, a clear peak of serum testosterone appeared, reaching 145.7% of the baseline ( P < 0.01). No regular fluctuation was observed following continuous abstinence after the peak. Ejaculation is the precondition and beginning of the special periodic serum testosterone level variations, which would not occur without ejaculation. The results showed that ejaculation-caused variations were characterized by a peak on the 7th day of abstinence; and that the effective time of an ejaculation is 7 days minimum. These data are the first to document the phenomenon of the periodic change in serum testosterone level; the correlation between ejaculation and periodic change in the serum testosterone level, and the pattern and characteristics of the periodic change.


Yes, we often cite this research. It shows that the cycle is at least a week long...and who knows what other neurochemical/hormonal dominoes fall before and afterward???

According to this study, if

According to this study, if a man wants higher T levels, he has to ejaculate every 7 days for a one day statistically significant spike. I think their study was too narrow. They only went out to 16 days. They didn't consider other stimulation. They didn't consider whether repeated ejaculation within a 7 day period lowers the baseline from the 16 day abstinence group 2. They didn't consider how the body might be triggered to use T after the spike. While the serum levels return to baseline, production might remain higher.