B-12 confusion

Hi everyone!
Totally new here. So I noticed as I was figuring my diet out that B 12 is listed as an IU. I've never seen this anywhere else. Even my b-complex bottle lists B 12 as mcg. There's no place telling me how to convert mcg into IU's for B 12. Am I missing something? Is there a way to change the IU to mcg?
Thanks for your help.


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