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Further study on the brain injury model of mice induced by Cadmium (Cd) showed that L-theanine could protect mice from Cd-induced neurotoxicity, which was achieved by reducing the level of Cd in the brain and plasma, inhibiting the death of neurons in the cortex and hippocampus, improving the activities of SOD, GSH, and CAT in the brain, and most importantly, significantly alleviating the hyperphosphorylation of tau protein Ser199, Ser202, and Ser396 (26)

But Vitamin C does something that Niacinamide doesnt do it stimulates collagen production

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Insufficient Evidence for: The following purported benefits are only supported by limited, low-quality clinical studies