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Other sellers admitted using regulated ingredients such as kojic acid, hydroquinone and a powerful antioxidant, glutathione, which may cause rashes and other side-effects.

Patients affected by the disease are found to also experience an imbalance of glutathione regulation, which is important for liver detoxification.

As a result, glutathione supplements have become increasingly popular as an over-the-counter approach to wellness.

But how glutathione actually enters mitochondria was unknown until 2021, when Birsoy and his team discovered that a transporter protein called SLC25A39 delivers the package.

"It has two completely independent domains. One domain senses the glutathione, and the other transports it."