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2-4 Weeks : Boosted immune function and NK cell activity

While glutathione is generally considered safe when used appropriately, certain individuals should take extra precautions because their bodies may respond differently or may already be dealing with conditions that require careful balance

Efficacy of sodium tanshinone IIA sulfonate in patients with non-ST elevation acute coronary syndrome undergoing percutaneous coronary intervention: results from a multicentre, controlled, randomized trial

Gullner and Komives, 2006)

So while you can supplement with glutathione directly (and sometimes should), raising NAD levels can also help your body make its own glutathione more efficiently