Vitamins and urine color?

[DonaldJensen]

If while taking a high quality multivitamin, one's urine comes out bright green or bright yellow every time, does this mean that the vitamins are going right through the person or that the body is taking only what it needs of each vitamin/mineral and flushing the unneeded rest out? If the later isn't the case, is there anything one can do to better absorb the vitamins? Thanks.