advice? my prenatal vitamin is making me nauseous!

Liz • 37, trying for baby #2! 5 m/c, 1 d&c. 1 ectopic. One perfect almost 2 year old son who is my world.
I have been taking rainbow light prenatal vitamins for 7 months and within the last two or three months they've been making me SO NAUSEOUS!! I almost just threw up at the grocery store! Any advice on what to do? I would rather suffer through the nausea than stop taking vitamins in general, but I'd sure like to feel better!