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In addition to being a precursor to glutathione, NAC is an antioxidant in its own right

Antioxidants 13(3):254 Massa CM, Liu Z, Taylor S, Pettit AP, Stakheyeva MN, Korotkova E, Popova V, Atochina-Vasserman EN, Gow AJ (2021) Biological mechanisms of s-nitrosothiol formation and degradation: how is specificity of s-nitrosylation achieved

But if you caught your deficiency early and its milder, you might feel subtle improvements in as little as 5-7 days after starting shots

If your levels were low to start, one injection helps refill your tank, and you may feel steadier for a couple of weeks

The speed at which B12 treats nerve symptoms shows differences between patients

Its antioxidant activity also supports a more even, brighter complexion by reducing oxidative stress in the skin