A Common Vitamin Has a Complicated Link to Cancer, Experts Reveal

Vitamin B12 is essential for normal DNA copying and cell function, and low levels can raise cancer risk.

Some studies link very high B12 intake or blood levels with cancer, but the evidence is mostly observational and does not prove causation.

In many cancer patients, elevated B12 may be a marker of the disease itself, such as liver involvement or increased binding proteins.

The takeaway: use B12 supplements based on actual need, not the idea that more is always better.