The absorption process is highly efficient at physiological doses, with approximately 50% of dietary B12 absorbed when consuming around 1 microgram
BioMed Central Medicine 10, 91.Google ScholarPubMed Bourne, C, Aydemir, O, Balanza-Martinez, V, Bora, E, Brissos, S, Cavanagh, JT, Clark, L, Cubukcuoglu, Z, Dias, VV, Dittmann, S, Ferrier, IN, Fleck, DE, Frangou, S, Gallagher, P, Jones, L, Kieseppa, T, Martinez-Aran, A, Melle, I, Moore, PB, Mur, M, Pfennig, A, Raust, A, Senturk, V, Simonsen, C, Smith, DJ, Bio, DS, Soeiro-De-Souza, MG, Stoddart, SD, Sundet, K, Szoke, A, Thompson, JM, Torrent, C, Zalla, T, Craddock, N, Andreassen, OA, Leboyer, M, Vieta, E, Bauer, M, Worhunsky, PD, Tzagarakis, C, Rogers, RD, Geddes, JR, Goodwin, GM (2013)
At 5 mg per week, the vial provides 3 weeks of doses within the 28-day stability window
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Effects of Dietary Protein on Thyroid Axis Activity