I can vouch for Cabinmon too. I was worried as shipping took over a week lol, but my patience payed off, and my wife was thankful a few times the night they arrived. I took brand name viagra before, and got the headache described above, but not a sniff of it with this stuff. I'd say I needed a good hour to take effect, Multi day effect too. Not that I'm walking around with a chubby, but a strong breeze and shit starts happening like 20yrs ago. I'd say 3 days, and even a week after when I do get hard, it seems 'harder'. Can't say I saw a change in size though....but without a doubt its looking skywards instead of to the ground.