Is it possible to get TOO MUCH B-12?

I am supposed to take 350 mcg. of B-12 sublingually each day. The lowest dose I could find at GNC is 1 mg, which is almost 3 times more than I need. If I take it everyday, can something go wrong? Is it possible to overdose on B-12? I am 5 weeks post-op Lap RNY, down 30 pounds!! Woo-hoo!

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