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Table 3 Distribution of the use of oral vitamin B12-containing supplements and concomitant serum B12 concentrations

From: Relationship between serum B12 concentrations and mortality: experience in NHANES

Vitamin B12 supplements Number Serum B12 (pmol/l) Serum B12 < 140 Serum B12 > 1000
Median (IQR) Minimum Maximum
No supplements 16,385 321 (242–423) 10.5 148,936 488 (3.0%) 211 (1.3%)
0–4.9 mcg 1115 345 (258–458) 75.3 9810 22 (2.0%) 19 (1.7%)
5–24.9 mcg 3358 391 (294–523) 25.1 75,645 47 (1.4%) 83 (2.5%)
25–99 mcg 1774 428 (321–564) 36.9 4794 24 (1.4) 61 (3.4%)
100–999 mcg 780 502 (373–696) 86.4 7557 4 (0.5%) 80 (10.3%)
> 1000 mcg 387 732 (495–1198) 103 8576 3 (0.8%) 125 (32.3%)
Unknown 463 377 (280–548) 34.7 33,837 6 (1.3%) 26 (5.6%)
  1. Participants reporting the use of B12 injections under dietary supplements or prescription medications were excluded