Confused about spirulina?

I've been taking a shot of spirulina each day (1 teaspoon in a little water).

I keep reading that B12 analogues do more harm than good, so should I go easier on it, or even omit it altogether?

These days, I take a B12 supplement occasionally as part of a multivitamin and have some B12-fortified foods like soy milk and yeast extract. I doubt I get 100% of the RDA on a daily basis, so want to 'preserve' what B12 I do get.

Thanks in advance :)

Hi loveganism,
Have you looked at the B12 and B12 analogues in multivitamins, animal foods and spirulina-thread yet?