I'll admit, it took a while to see changes, but I'm somewhere around my 6 week mark and I can see where it has helped.
Strength - seems slightly up on some lifts
Endurance - no change
Muscle size - Big change
Bodyfat - no change (diet didn't help)
My diet - very inconsistent, good then bad
My workouts - about 3 times per week average with lots of compounds
Let me add that any change I've noticed cannot be attributed to a great diet or optimal training. I have traveled much the last 2 months and my training has been all over the place, diet has suffered not only in quality but quantity at times.
I have noticed that my leg size has stayed constant despite reducing the volume in half and only training them once per week
I have noticed that my back/detls/arms/traps have grown significantly... I don't get it because I have not targeted traps or back with any special emphasis or extra work at all - especially my traps. I haven't shrugged in months.
My chest has taken on a much more full appearance, more macho.
I soooo wish I could've maintained an actual consistent program with a solid diet. Some days I doubt I was getting even .75g/lb protein. I feel ashamed of my diet.
Carbolin 19 would have to be a valuable addition to a well structured plan if it worked this well for me on a haphazard, frequently interrupted approach.
Just like TC says, wait at least 4 to 6 weeks to get results. I still have another bottle and a half left, so hopefully I can turn the tables with my training and diet for more results.