Re: Vascularity~
The only supplement you can take for vascularity is creatine...mostly sold at any gym or health food store. Lots of body builders take it.
You can also work on your body fat %...the lower it is the more veiny you will get. Yes, more weights will help also. Higher reps and more pumps.
Some people do have a tendency to be more veiny and some dont. It does depend to a certain degree on your body and the lay out of your veins...genetics.
Even if you take the cocktails of supplements a lot of body builders do take, it only works for a short period of time...its meant for shows and competitions. Long term use could actually hurt you.