For transparency: this figure does not come from any published human study the actual mouse research used subcutaneous injection at 20 mg/kg three times daily, a very different route, species, and dosing basis than the oral use commonly sold
A lack of vitamin B12 can cause a variety of health issues, including fatigue and permanent neurological changes
[DOI] [PubMed] [Google Scholar] 96.Lowell BB, S-Susulic V, Hamann A, Lawitts JA, Himms-Hagen J, Boyer BB, et al
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If you follow a vegetarian or vegan diet, you may have to seek alternative sources of B12 like tablets or the B12 injection to ensure you have the required levels of B12 to prevent deficiency
For oral supplementation specifically, yes liposomal glutathione is generally considered better absorbed than standard reduced glutathione, because the phospholipid coating protects the molecule through digestion