UGL/Home Brew can be excellent. There are actually only a few true Pharma grade oils.
That would include companies such as Watson (typically carried by US pharmacies),Organon and Astra Zeneca. Others including Global , platinum Bio, Atlas are actually UGL as they don't meet all specs for pharma grade, at least not US specs. Yes they have fancy websites but that means NOTHING.
Not saying they are not GTG.
I imagine some home brews are better than true pharma as far as concentration. The big issue is purity, filtration etc.
There are some UGL on this board I have used and are happy with.
There is another that IMO produces bunk Gh and I would never use again.
No i will not mention the name.
With test esters it is pretty easy to see if you have bunk gear.
Just get on cycle and check your test levels after say 2 weeks.
Aside from test and Gh there is really no way to check other compounds.
You cannot get a nandrolone or a winstrol level.
Does not matter which you use as long as it is GTG.
Forget the Bro Science that claims you should have a serum total level 7-10 x the mg you are pinning.
That is bullshit.
Fact is people on TRT may be pinning 150/wk of Watson test cyp (true Pharma Grade) and there serum level may not be 1050-1500.
That oft mentioned factor of 7-10X is out the window!!
Frankly you really do not need 400 mg/wk for your first blast.
Why not try 200-250 and see how you do with gains and your estradiol level?