spirulina and vitamin B-12 absorption

"Kim" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

The multi-vitamin/mineral supplement I've just started taking also contains 1000 mg of spirulina
(4 very large tablets per day). Earlier postings on this group have stated that there have been
studies showing that spirulina may inhibit vitamin B-12 absorption. Has anyone here had patients
who have experienced this problem? Is spirulina safe to ingest? Thanks in advance for responding.

Spirulina tablets are notoriously difficult to digest and are often passed whole. Even in powder
form they amy not privide an adeqauate source of B12:

beyondveg.comcomp anat 7c.shtmlOpen ↗

"We suspect that people taking spirulina as a source of vitamin B-12 may get vitamin B-12 deficiency
quicker because the analogues in the product block human mammalian cell metabolism in culture [i.e.,
in the lab] and we suspect that they will also do this in the living human. The presence of
analogues, rather than true B-12, in fermented foods makes them unreliable sources for B-12."

The main safety worries would be cyanotoxin contamination
google.comsearchOpen ↗ and mercury

personalhealthzone.comspirulina side effects.htmlOpen ↗

Regards

Jim