Thank you for your valuable feedback, Imran. I am sorry you had B12 deficiency despite consuming animal product. It is most likely due to a genetic issue which I explained in a new story. I link it here so you may discuss it with your health consultants. It is a common condition.

MTHFR Polymorphisms or Mutations: Getting Checked to Prevent Cardiovascular Issues

Advocating the need for personal health screening and promoting health assessments for the prevention of cardiometabolic disorders for those in the risk group

https://medium.com/illumination/understanding-mthfr-polymorphisms-or-mutations-matters-the-value-of-getting-checked-b4ecf806d6db