Wow, thanks Joey and Lotus, great information there.
Lotus, by 'ideal', I mean all of those things. By evolution, and by what is optimal for us now.
One of my staples is a vegan meal replacement called The Ultimate Meal, which has 15 mcg of B12 per serving, I assume comes from the spirulina in it. I usually have 2 servings per meal, or about 30 to 60 mcg of this B12 per day. Reading about spirulina B12 bioavailability looks inconclusive, but I assume that since the RDA is only a few mcg, if ingesting 30 times that amount, even in spirulina, there should be enough metabolized to cover the daily B12 requirement.
Otherwise, thanks for the information!
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