encapsulated glutathione LipoEdge Liposomal by WBCIL the Setria Glutathione molecules are wrapped in double layered phospholipid spheres (liposomes) that protect the antioxidant through the digestive system and transport it into the bloodstream for absorption in the cells. Glutathione Serum Review: Encapsulated Brightening
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Or, it could be from an underlying digestive condition
, BPC-157

The best option depends on your symptoms, lab results, and overall health

Why Storage Really Matters B12 itself is pretty stable at normal room temps