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Also oral administration, although with conflicting results, resulted in increased serum GSH levels with reduced oxidative stress and beneficial effects in several diseases (27, 28)

There's no standard dosage for astaxanthin

Healthy aging More recently, researchers have studied NAC in combination with glycine, a combination often called GlyNAC

Second, many of the included studies relied on DCF-based probes that measure total oxidative signals, making it difficult to distinguish specific ROS species and their sources

So, when we say glutathione is reduced, we mean it can remove oxygen or ROS hence its being an "antioxidant" after which the glutathione becomes oxidized