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Further, NICE and the BNF says that if there are neurological symptoms present, then every other day injections are the recommended treatment, so all the points you make about B12 being stored and sufficient are not really relevant

Supplements: NAC, Alpha-Lipoic Acid, liposomal glutathione, and milk thistle may help maintain optimal levels

Citations below describe published work

In this case, the modulation is closely associated with the levels of GSH and GSSG forms

Additionally, zinc is important for maintaining sperm quality

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