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Skin calms but gut symptoms remain

This is because it requires conversion to the active form of vitamin B12

Some common signs include: Fatigue and weakness Numbness or tingling Memory issues Pale or yellowish skin Shortness of breath and dizziness Fast or irregular heartbeat It is time to take vitamin B12 to improve symptoms, depending on individual cases

10.1016/s0006-3495(93)81254-2 345

Bottom line: Route of administration and regulatory status matter here more than usualand most online discussions gloss over both