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Substantial amounts of vitamin B12 were found in some edible algae (green and purple lavers, seaweed) and chlorella tablets. A study suggest that algal vitamin B12 is a bioavailable source for mammals.

Pseudovitamin B12 (an inactive corrinoid) predominated in the spirulina tablets, which are not suitable for use as a vitamin B12 source, especially for vegetarians. 

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The worst sin toward our fellow creatures is not to hate them, but to be indifferent to them: that's the essence of inhumanity. 

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