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These foods have higher levels of B12, per the NIH: Beef liver, 70.7 micrograms Clams, 17 micrograms Oysters, 14.9 micrograms Nutritional yeast, 8.3 to 24 micrograms Salmon, 2.6 micrograms Tuna, 2.5 micrograms Dairy products and some breakfast cereals also contain B12, but "it's primarily in animal products, Cording says

In patients with GH deficiency, administration of GH resulted in impaired glucose tolerance and insulin sensitivity

Older adults are also more likely to take medications that can interfere with B12 absorption, Manson says

This code covers the act of the injection itself, whether it is done through an intramuscular (IM) or subcutaneous (SubQ) route

10.1124/jpet.111.187583 51 EvansC