Spirulina is the highest source of Vitamin B-12, essential for healthy nerves and tissue, especially for vegetarians.
Lots of evidence that the B12 is in a slightly different form than that which can easily be absorbed by humans, so it is debatable how much good this B12 will do you.
It seems to be only B12 that has this absorption issue.
The rest of the nutrients in Spirulina do seem to be bio-actively available to the body.
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