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PSA-2D is used to evaluate the oral absorption of a compound, and a value of below 100 2 means an ideal oral absorption
Bibliography 1.Grygorowicz
Hu Y, Zhou Y, Yang Y et al (2022) Metformin protects against diabetes-induced cognitive dysfunction by inhibiting mitochondrial fission protein DRP1
If you switch the form and the symptoms go away, that tells you the issue wasn't the B12 itself or the level it was the specific form your body had trouble with
