We also test for heavy metals according to USP guidelines to make sure safety and compliance with rules
Beyond simple actin sequestration, Bock-Marquette and colleagues reported in Nature (2004) that T4 activates integrin-linked kinase and Akt, promoting cardiomyocyte and epicardial cell migration and survival in mouse cardiac injury models, which established a signalling role separate from cytoskeletal buffering
A French study showed that among 172 elderly patients with vitamin B 12 deficiency, only 2% accounted for inadequate intake,26 while in a hospital-based Chinese study on 52 patients, only 3.8% (median age, 73.5 years) with megaloblastic anaemia (98% had vitamin B 12 deficiency) had inadequate dietary intake.27 However, this can be a problem in strict vegans because animal products are the only dietary source of vitamin B 12
A Certificate of Analysis is available for every batch on the Certificates of Analysis page
If you still think B12 is just about haematology or even haematology and neurology then you are woefully under-educated