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Originally the source for intrinsic factor was virtually unprocessed normal gastric juice obtained from healthy volunteers
In a research context, the main limitations are the gap between animal and human data, stability sensitivity requiring proper storage, and the risk of compromised results if purity is not independently verified
If you want a broader overview of the pathway from symptoms to testing, Does Gut Health Affect Thyroid
When it comes to dosing, however, always follow the instructions of your provider
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