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Such visible signs consisted of improved skin firmness, elasticity, and clarity as well as reduced wrinkles and fine lines [5]

In another small study involving 15 patients receiving hemodialysis (where blood is pumped out of the body to an artificial kidney machine), they were found to have gastrointestinal symptoms, including constipation (likely due to restrictions in their water intake required as part of their therapy), as well as carnitine deficiency

Zang et al

Older individuals who added cysteine and glycine to their diet to increase their glutathione levels improved insulin resistance and fat burning within two weeks [2]