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Thread: B12 levels in 12 seaweeds

  1. #1
    Ex-admin Korn's Avatar
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    Apr 2004

    Default B12 levels in 12 seaweeds

    With food seaweeds, the really interesting member of the B group is vitamin B12; and it would help now to recall the analytical figures and concentration factors quoted earlier for cobalt, since this element is the inorganic constituent of vitamin B12. Provasoli has summarized the figures for the vitamin B12 content of various seaweeds published by several groups of research workers. The following are high in this vitamin:

    Red: Acanthopeltis japonica
    Ceramium rubrum
    Ceramium tenuicorne
    Gelidium amansii
    Laurentia pinnatifida
    Polysiphonia brodiaei
    Rhodomela subfusca

    Green: Enteromorpha intestinalis

    Brown: Alaria esculenta
    Hymenthalia elongata
    Laminaria digitata
    Laminaria hyperborea

    Apparently green seaweeds contain more than red, and both are higher than brown. It has been shown that some algae can accumulate cobalt to the remarkable extent of producing a concentration factor of 10,000 (Ericson). The origin of the B12 is bacterial — due either to the presence on the algae of epiphytic bacteria which synthesize this vitamin or to the occurrence of these bacteria in the surrounding sea-water. In either case the vitamin is taken up by the seaweed and accumulation occurs. ‘Bacteria from algae which were poor in vitamin B12, generally produce small amounts of B12, while bacteria from vitamin B12-rich algae formed larger quantities of the vitamin’ (Lundin and Ericson). These authors also suggested that red and green seaweeds may have higher B12 contents than brown because the former ‘often have greater surface areas per gram dry weight than the brown algae.’

  2. #2
    Ex-admin Korn's Avatar
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    Apr 2004

    Default Re: B12 levels in 12 seaweeds

    According to this source (, 6 6 listed types of seaweed contain amounts of B12 per 100g:

    Ascophyllum nodosum 0.131 (rockweed, also called Norwegian kelp, knotted kelp, knotted wrack or egg wrack)
    Laminaria digitata 0.495 (oarweed, also known as 'tangle' or 'tangleweed')
    Undaria pinnatifida 0.345 (wakame or mekabu)
    Porphyra umbilicalis 0.769 (sloke/purple laver/laver)
    Palmaria palmata 1.840 (dulse, dillisk or dilsk)
    Ulva spp. NA 6.300 (Sea lettuce, "green nori"?)
    I will not eat anything that walks, swims, flies, runs, skips, hops or crawls.

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