[throwaway2037]

Wiki disagrees about B12 in nori:

    > A 2014 study reported that dried purple laver ("nori") contains vitamin B12 in sufficient quantities to meet the RDA requirement (Vitamin B12 content: 77.6 μg /100 g dry weight).[19] By contrast, however, a 2017 review concluded that vitamin B12 may be destroyed during metabolism or is converted into inactive B12 analogs during drying and storage.[20] The Academy of Nutrition and Dietetics stated in 2016 that nori is not an adequate source of vitamin B12 for humans.[21]

Ref: https://en.wikipedia.org/wiki/Nori#Nutrition

[bumby]

Thanks, I was only going off the nutrition label, it shows 60% RDA per sheet. However, the reference link for the academy is broken; I wonder if they’ve changed their stance? Other references indicate raw nori has B12 but the drying process may turn it to an inactive form.

[jhugo]

They probably got the numbers for the nutrition label from the earlier study and nobody got around to checking yet.