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It can also be produced artificially in the laboratory
Here's the key: DO NOT inject the water directly onto the lyophilized powder
This process includes a review of symptoms, a physical examination, and blood tests
Without it, B12 from food or tablets is simply locked out
The complete documents released can be viewed here: Safety Risks Associated with Certain Bulk Drug Substances Nominated for Use in Compounding | FDA Interim 503B Bulks List: download (fda.gov) Interim 503A Bulks List: 503A Categories Update for September 2023 (fda.gov) What Are the 503A and 503B Bulks Lists
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