The honest position is this: there is no head-to-head human bioavailability trial telling you which route is superior for this specific molecule, so the best route is not a settled question
V., Jain, A., Erickson, D., et al
You may benefit from a B12 injection if you: Feel tired, sluggish, or mentally foggy Are vegetarian, vegan, or on a restrictive diet Take medications like metformin or proton pump inhibitors (PPIs) Have digestive issues that impair absorption (e.g., IBS, celiac, bariatric surgery) Experience mood swings, irritability, or low motivation A consultation with your provider can help determine if you have symptoms of deficiency or if youre simply looking for a wellness boost
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