If you read the Nebido literature, it’s clear why it “doesn’t work.” They were trying to find a way to brand it, so they determined the shot frequency by measuring the time where T is right at the bottom of the range on average. The goal was for the fewest shots per year to barely be in normal.
It’s not terrible logic for a group of people with 200 ng/dl T as it’s still “more than they would have anyways,” but it doesn’t fit with the ideology of most online trt patients. Also, the 1,000 mg every 12 weeks is equivalent to about 73 mg of Test-E per week, so it’s a lower dose too.
The half-life is supposedly 21-30 days (depends on the oil) and a more reasonable protocol would be dosing every 2 weeks. Keep in mind the ester is heavier; so, Test E is 72% free T while undecanoate is 63%, so you’ll need about 15% more for the same levels. A cc (at 250 mg/ml) every 2 weeks should be ideal.
It’simply testosterone attached to a different molecule. The every 12 week protocol is akin to the very first Test C and E protocols which were 200 or 250 every 2-3 weeks. Standard shot times for those esters have condensed, and they should for undecanoate as well.