This normal range is usually referred to as blood values between 140 and 600 pmol/l
Vitamin B12 is easy to find in animal products like meat, eggs, dairy, and fish
PMC 5986001
So when a medic says that someone with PA "can use the stored B12 in their liver", as far as I know, we simply don't know whether this is true or not
Thats why it is important to talk to your physician before self diagnosing
29 Both acute and chronic stress signaling via hormones and neurotransmitters can increase thrombosis risk by increasing platelet numbers, reactivity, and aggregation, disrupting normal vascular function, up-regulating the clotting cascade, and altering fibrinolysis mechanisms