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Sever et al., 2019) and blood supply
The Advantages of B12 Injections for Athletes Superior Absorption While oral B12 supplements are available, injections offer a significant advantage in terms of absorption
If I understand rightly you haven't an absorption problem.So once on supplements or a richer B12 diet you can store and utilise b12 from your liver
Quality, sourcing, dosing, and medical supervision aren't optional details they're the whole game
Oral delivery is pharmacokinetically disadvantaged versus injection for systemic targets, but may have a genuine local advantage for GI-tract applications because degradation products act locally before absorption
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