I appreciate your reply. I've used many with DMAA and DMHA. I gotta admit, they give me a long lasting boost the carries me thru the day that nothing has ever given me before, well after I've left the gym. Ive worked a very physically demanding job for the past 25 yrs and I've even taken them just before work to get thru a 10-12 hour day. I have to admit I'm much more productive in the gym and out of the gym using a strong pre and I've never considered myself lazy. Unfortunately I have experienced the ED issue and it's a definite factor and the ultimate reason I stopped using them at all. NOTHING is worth taking that can ruin my sex life.