There are two PAS support groups in USA
The specimens were processed on paraffin wax, and 5-m-thick paraffin sections were obtained and stained with hematoxylin and eosin or immunohistochemically for FVIII (Dako, Glostrup, Denmark) using Dako Autostainer, according to the manufacturers protocols
(PubMed) Not well supported: That the combination reliably improves clinically meaningful outcomes (fat mass reduction, strength, functional performance, cardiometabolic markers) in the general population
Older adults are often advised to take B12 supplements to prevent deficiency and related health issues 2
Adequate stomach acid is required to release the vitamin from the protein, and a substance called intrinsic factor is necessary to ensure its absorption
For example, iron deficiency causes iron-deficiency anemia