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No, cloudiness or discoloration are late-stage signs of heavy contamination

But research says that this vitamin definitely helps with a rare genetic disease (Imerslund-Grasbeck disease) that causes a Vitamin B12 deficiency

Ferguson GB, Van Handel B, Bay M, Fiziev P, Org T, Lee S, Shkhyan R, Banks NW, Scheinberg M, Wu L, Saitta B, Elphingstone J, Larson AN, Riester SM, Pyle AD, Bernthal NM, Mikkola HK, Ernst J, van Wijnen AJ, Bonaguidi M, Evseenko D, "Mapping molecular landmarks of human skeletal ontogeny and pluripotent stem cell-derived articular chondrocytes", Nat Commun 9 (1): (2018)

Very highly recommend

Additionally, methodological differences, small sample size, outcome measure variability, incomplete reporting, biological confounders, and overgeneralization of the results make evaluating innovative pharmacological agents challenging [27]

It has been demonstrated that eryptosis might alter cell volume, shape, granularity of erythrocytes, as well as modify the phospholipid composition of both inner and outer leaflets of phospholipid bilayers in the cell membrane, leading primarily to PS externalization [85, 86]