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Neuromol Med 2015;17:270-84

Injection and oral supplements are usually prescribed by a doctor and are effective in increasing vitamin B12 levels in the body

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Oral Supplements Cyanocobalamin tablets (common) Methylcobalamin (easier to absorb) B12 sprays or dissolvable tabs Pros: Easy to take No needles Affordable Cons: Absorption varies Not ideal for GI conditions Food Sources Liver (highly concentrated) Eggs Red meat Cheese Shellfish and fish Plant-based

Therefore, results in the rabbit ear vein compare well with those in the rat tail vein

These findings are valuable for mechanism, but they cannot substitute for controlled human outcomes