The appearance of dark circles can also be a result of shadows cast by puffy eyelids or hollows under the eyes that become more pronounced as we age
doi:10.5455/msm.2021.33.60-64
Renal effects of N-acetylcysteine in patients at risk for contrast nephropathy: decrease in oxidant stress-mediated renal tubular injury [archive], Nephrol Dial Transplant, 2004;19:18031807 ACT Investigators, Acetylcysteine for prevention of renal outcomes in patients undergoing coronary and peripheral vascular angiography: main results from the Randomized Acetylcysteine for Contrast-Induced Nephropathy Trial (ACT) [archive], Circulation, 2011;124:12501259 N-Acetyl Cysteine for Depressive Symptoms in Bipolar DisorderA Double-Blind Randomized Placebo- Controlled Trial, jBiological Psychiatry, Volume 64, Issue 6, Pages 468-475, M
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Protects against oxidative stress