took my first pill at around 4 o' clock yesterday......noticed effects after about an hour....noticed full effects a couple hours after......todays is the day after and its still working....i like this product more then i thought i would....i did get a headache after a while but that could have been from drinking a little bit, but i took ibuprofen and it was gone in 30 mins, it didnt come back in the morning today i feel great, libido is way up, i had a suprizingly good workout....i will defineatly be buying a couple bottles of this,