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“Probably most of . . . [the vitamin B12 content of blue-green algae] is due to the fact that the stuff is grown in . . . lakes . . . in Mexico that are contaminated with fecal matter; and the feces, of course, animals feces, have considerable B12 in them. . . . I suspect that's where most of it comes from, the stuff being not thoroughly washed before it's dried. . . . Spirulina is the biggie, of course. . . . Spirulina is a blue-green [alga], but not all blue-green algae are spirulina.”