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Deficiency In healthy adults, overt vitamin B 12 deficiency is uncommon, mainly because total body stores can exceed 2,500 g, daily turnover is slow, and dietary intake of only 2.4 g/day is sufficient to maintain adequate vitamin B 12 status (see The RDA) (4)

Blevins CA, Weathers FW, Davis MT, Witte TK, Domino JL

Cox regression and ROC curve were performed

There is real science here, including a properly blinded human clinical trial showing statistically significant regrowth

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[16] [121] Investigations into the intestinal absorption of B 12 confirm that the upper limit of absorption per single oral dose is about 1.5 g, with 50% efficiency