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B12 injections are injected into the muscle and dispersed over time, therefore bypassing the digestive tract, so you get much higher absorption than you would orally
For first-time users, the published evidence base is strongest on topical at 1 to 2%
Endocrinology 153 , 42784289 (2012)
[7] [4] If you experience any unexpected or concerning symptoms following injection, err on the side of caution and seek medical advice promptly
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