Vitamins, i take Animal pak. One pack a day, only really when im deployed though because my diet out here can get very restricted. A well balanced diet really is the best answer for most vitamin needs minus any major deficiencies (hereditary, age or allergy based).
I stick to straight mono creatine also, its cheaper and it works. I stick to small dose after workout just to help with recovery, and its one of the few supp Ive ever really found makes a difference.
Of course a little extra protien works wonders, casein at night after workout days has always helped me, and ive never gained bad weight from it. If anything I look leaner and feel stronger in the mornings after a bedtime casein shake
And it seems its just me, but I have gotten away from Pre workouts. I used too be all about them, and they are great for those days when your sucking or just cant get motivated. But for everyday use, it just cannot be healthy long term, just my opinion though! I dont want to open any floodgates lol