Originally posted by inhale rocks:
the only problem with the higher gauge needles if for them to hook at the end, possibly damaging the vein, but if you use a clean sharp each time, you shouldnt have any problems.
Inhale hit the nail right on the head. Smaller needles provide less trauma to the vein, but they dull VERY fast, using them more than once can be dangerous... Not that you should use a needle more than once anyway, but many people do. 28s are just fine. I personally use 29 gauge needles, and have never used anything bigger... They work just fine.