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He gave the name intrinsic factor to whatever it was in his stomach juice (and vomit) that enabled the absorption of the extrinsic factor, which was later isolated and named Vitamin B12
Why Not Just Use Sterile Water
PMID 17991676
Special Considerations for Off-Label Use Those seeking B12 for off-label purposes should be particularly cautious: Unknown B12 status could mask severe deficiency Underlying medical conditions might increase risk Interaction with other supplements or medications False sense of security leading to delayed medical care Risk of hiding serious underlying conditions The Critical Importance of Pre-Treatment Testing Given these potential complications, comprehensive blood testing before B12 replacement therapy is essential, regardless of intended use
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