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Description
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

NAC can be taken on an empty stomach, but if you have a sensitive digestive system, taking it with a small snack or meal can help prevent mild discomfort
March 2021

doi: 10.1016/j.scienta.2019.108715
