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For extremely small doses, some researchers use dilution techniques
Bacterial contamination may not show obvious signs
A more likely reason for deficiency would be low absorption in the gut, probably because of pernicious anemia or another condition
Unlike most peptides, it is stable in gastric juice, which is part of why it is one of the most heavily researched peptides available
The body absorbs only as much B12 as it needs, and any excess is eliminated naturally
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