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Science 350(6265):12041207

The researchers monitored the effect of FOXO4-DRI on a group of aged laboratory mice, noting a significant decrease in the number of senescent Leydig cells and a parallel increase in the concentration of testosterone in the blood plasma

You've tried the sleep hygiene rules everyone recommends

Higher-dose protocols are being studied

Treated mice displayed myofibers nearly twice as large in cross-sectional area and demonstrated higher contractile strength, with reports of up to 70% greater force compared to untreated groups

Note that PA isn't caused by not eating foods that contain B12, but rather by your body's inability to absorb B12