Well, I can now report, several days in, that I can add Norcodrene to the growing list of supps that have zero effect on me. At least in terms of 'feel'. For example, I took one cap this morning on empty stomach... nothing. Then two caps this afternoon, about 3 hours after my last meal, prior to an HIIT session on the bike... I felt nothing, nada, zip, zilch, nowt! I'll keep at it, see what results I get in terms of fat loss, but I can't say I'm surprised. I'm immune to pretty much everything. I'd make a fascinating subject for scientific study (but no dissection please). What's more surprising to me about this is that I have barely touched caffeine in 2-3 months... including coffee. The strongest stimulant I've had is a cup of green tea!