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It could point to several things: A different cause: your fatigue might stem from thyroid problems, iron deficiency, or sleep apnea rather than B12

39 A recent study on human subjects, indicates that loss of -crystallin potentiates the formation of nuclear cataract and that the amount of -crystallin remaining in the lens nucleus can be monitored in vivo by dynamic light scattering

However, the study was not placebo-controlled and did not report actual illness occurrence [24]

Mechanism of Action of Glutathione Glutathione is involved in numerous biological processes, including tissue building and repair, and the production of essential chemicals and proteins for the body and immune system