Halflives: Enanthate - 8 days, Cypionate - 10 days, Decanoate - 14 days, Undecanoate - 21 days.
Peak to trough fluctuation of hormones:
Enanthate - 37.3% E3.5D
Decanoate - 24.4% E3.5D, 45.2% E7D
Undecanoate - 10.7% E3.5D, 20.0% E7D, 34.8% E14D
As you can see, using Test U on a twice weekly schedule gives you an absolutely FLAT hormone curve. Twice weekly is effectively flat as well, and injecting every other week is just as effective as twice weekly enanthate. These numbers were generated based on Steroidcalc after all hormones had achieved saturation and stable levels. Long story short, if you’re BnC and don’t plan on coming off then Test U once a week or every other week really is the way to go. You just have to factor in that there is less hormone per mL. I don’t have the numbers handy but I remember planning on 150mg of Test U being equal to 125mg of test E for TRT purposes. Because Biomass’s Test U at 300mg/mL was perfect for doing every other week 1mL shot for a pure TRT cruise.
If you do Test U and also want to blast I absolutely recommend you don’t stop the Test U. It takes too long to build up and clear out. Keep injecting the Test U at your TRT base, and simply add Test A/P/E/C on top of it for your blast. So if you’re cruising on 150mg/wk of Test U, continue doing your once weekly injection of that but add on top of it 200-350mg of the Test E to arrive at whatever dose you’re aiming for. Test U’s 21 day half life means that your test will still be elevated even 2 MONTHS after your last “blast” injection if you use it on a blast. Very very hard to control in THAT regard. And it would take a full 105 days to clear your system entirely.
Anyways, I’ll be buying Test U from Southern Comp if he stocks it which I BELIEVE he is planning on.