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43. Vitamin B-12 from algae appears not to be bioavailable. Dagnelie PC; van Staveren WA; van den Berg H Am J Clin Nutr; 1991 Mar; 53(3):695-7. PubMed ID: 2000824 [TBL] [Abstract][Full Text] [Related]
44. Assessing vitamin B-12 absorption and bioavailability: read the label. Miller JW; Green R Am J Clin Nutr; 2020 Dec; 112(6):1420-1421. PubMed ID: 33021625 [No Abstract] [Full Text] [Related]
45. The elderly need oral vitamin B-12. Herbert V Am J Clin Nutr; 1998 Apr; 67(4):739-40. PubMed ID: 9537622 [No Abstract] [Full Text] [Related]