L-Glutathione may be referred to as natural glutathione, reduced glutathione, L-glutathione, oral glutathione , or glutathione pills. These are all referring to the same product.
If you take any of these products, the glutathione is destroyed in the gut and does not raise your glutathione levels in your cells, where you need it. You must make glutathione in your cells with the building blocks that are necessary for production.
The best ways to raise glutathione are with variants of the amino acid cysteine.