Fact check using credible sources.
https://www.mayoclinic.org/drugs-sup...2/art-20363663
Food sources of vitamin B-12 include poultry, meat, fish and dairy products
The fact you have to use the word supplement is evidence alone that you are on the wrong path.
It’s impossible arguing to someone who ignores the facts and seeks out alternative choices as a lifestyle change.
Humans evolved from consuming shell fish and other sources of meat.
You aren’t a cow, or a bird, or an ape, you are a human.
A balanced diet consisting of fruits, vegetables, grains, & meats is the best approach to a healthy diet.