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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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Dalai Lama

Life is as dear to a mute creature as it is to a man. Just as one wants happiness and fears pain, just as one wants to live and not to die, so do other creatures.

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