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In fact, people often mention them both in one breath, as in: "NAC is a precursor to glutathione." (A precursor is a compound that is used to form another compound, generally through metabolic reactions inside the body.) So which one, if either, is better to take as a supplement

Johansson et al., 2007

Lung Myeloperoxidase (MPO) Activity in Lung Extracts To measure MPO activity, we homogenized the right lungs in 50 mmol/L PBS containing 0.5% hexadecylammonium bromide and 5 mmol/L EDTA (pH = 6.0)

They also help protect the skin from environmental damage and stimulate collagen production for improved elasticity

The IV delivers these essential nutrients directly into the bloodstream, bypassing the digestive system for immediate and complete absorption