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Foods fortified with B12 and B12 supplements contain the free form of B12 so they are more readily absorbed
The same applies if your elevated B12 is accompanied by abnormal results on other labs (liver enzymes, kidney markers, CBC), or by symptoms like unexplained weight loss, persistent fatigue, abdominal pain, or easy bruising
Injection bypasses first-pass hepatic metabolism and gastrointestinal absorption variability, potentially achieving higher bioavailability
Their effects and safety profiles can also vary
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