Vitamin B12 has been shown to improve the depth and quality of sleep within studies
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It's derived from cellulose, the major component of the cell wall of green plants
Vitamin C, specifically, is a powerful antioxidant that can help reduce the effect of oxidative damage caused by pollution, stress or poor diet
Senol N., Naziroglu M., and Yuruker V., NAcetylcysteine and Selenium Modulate Oxidative Stress, Antioxidant Vitamin and Cytokine Values in Traumatic Brain InjuryInduced Rats, Neurochemical Research 39 (2014): 685692
screening their biological effects via in vitro assays or in vivo animal studies