Let’s explore “Vitamin B12 — lab reference”

One member of the vitamin E family; it is distinct from alpha-tocopherol, the form used to establish vitamin E requirements.

Are forms of vitamin K2, a family involved in activation of vitamin K-dependent proteins.

A compound sold in supplements; it is not an established essential human vitamin.

The older Purser genetics reference uses the heading “DAOA (AOC1)” in its gut section.

Encodes cubilin, part of a receptor system involved in uptake of the intrinsic-factor–B12 complex.

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