This comes from high-protein foods such as eggs, soy protein, cheeses, spirulina, sesame seeds, sunflower seeds, fish, chicken, beef and more.
Another tablet made from the usual suspects, Greenlife 3-in-1 Superfood Tablets contain chlorella, spirulina and Gotu Kola.
Spirulina sp. (From Engler and Prantl, Pflanzenfamilien, by permission of Wilhelm Engelman.) or because of the decay of a cell, becomes interrupted by breaking, and the free ends slip past one another.
Furthermore there have been claims that the algae spirulina and the seaweed nori contain significant amounts of B12.
Many enjoy mixing Spirulina powder in a green fruit juice smoothie as an instant breakfast, or a vegetable juice smoothie in the afternoon.