Ive tried it
used v12 2 times a day 1 serving AM and one pre wo with added 2-3g CEE
cee only on workout days non wo days 1 serving v12
It gave me more strenght and pumps and faster recovery between sets. than eather taken alone..
my favorite combo for now are swole v2 and cee but now i am trying swole v.3 as it is to see what that can give mee.
results so far on v3 is nice strenght gain, realy nice pumps almost like v2 and added cee. and it do give great endurance aswell.. I do spinning class 2-3 times a week..
good luck stacking it