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The one real argument for injecting is bypassing first-pass metabolism, and the strength of that argument depends entirely on which bioavailability study you believe (3.5% in mice versus 38.4% in rats)
Some people try tablets, but not everyone absorbs B12 properly through the stomach
& Woolf, C
Research shows that individuals who do not receive enough vitamin B12 have a much higher chance of becoming obese
Some participants achieved weight loss of approximately 24% of body weight at 48 weeks approaching levels reported with some bariatric surgical procedures, though no direct head-to-head comparisons have been conducted and long-term durability beyond the trial period remains unknown
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