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Common side effects include injection site reactions (burning, pain, swelling, redness), headache, mild diarrhea, and upset stomach
This journey is compromised in many individuals, particularly those over 50 or with digestive disorders
In general, taking higher-than-recommended levels of vitamin B12 is well tolerated
Oral supplements have to travel through your entire digestive system, where a lot can get in the way of proper absorption
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