I love Ulta Lab Tests for this purpose
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Click the link above or visit: Summary If you suspect you have a Vitamin B12 and/or Iron deficiency, the first step is to get tested
A B12 deficiency can result from various factors, such as malabsorption issues, specific medical conditions, or following a vegetarian or vegan diet that lacks sufficient B12
10.1038/nchembio.1380
Are there any human clinical trials for BPC-157