Vitamin B12

Vitamin B12 is functionally specific.

It is closely tied to neurological processes and cellular replication,
with roles in red blood cell formation and DNA synthesis.

At a high level, evaluation comes down to three signals:

• Form (methylcobalamin, cyanocobalamin, etc.) — differences in stability and metabolism
• Absorption pathway — dependence on intrinsic factor and delivery method
• Dose vs utilization — how intake translates into usable levels

B12 is often supplemented at high doses.
Absorption does not scale linearly.

Presence on the label does not guarantee effective uptake.
Delivery determines relevance.