A majority of nutritional experts contend that simply consuming oral glutathione supplements alone is insufficient to increase bodily supplies of glutathione significantly. (drvitaminsolutions.com)
Most forms of oral glutathione are not effective because they are destroyed in the digestive process. (articles.mercola.com)
Straight oral glutathione doesn't work well, but liposomal, reduced, and s - acetyl glutathione are absorbed. (susancnt.com)