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GPx-1 may also be transcriptionally upregulated as part of the cellular response to oxidative stress

This is opposed to oral vitamins that must be digested through the stomach and intestines, with a large percentage broken down or eliminated through urination

Injections of vitamin D3 can be particularly useful for individuals who have low levels of the nutrient due to factors such as a lack of sun exposure, a poor diet, or certain medical conditions

The administration of cysteine-rich glutathione precursors, especially N-acetyl cysteine, has been shown to increase intracellular glutathione levels

10.1371/journal.pone.0001944 PLoS One

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