Table 3.

Summary of the potential effects of l-Cys (combined with other compounds) supported by studies based on clinical trials.

Composition of the Mixture	Examples of Usage	Effects	Ref.
l-Cysteine + Glycine	Nutritional therapy in elderly HIV + patients	Improved oxidation of carbohydrates, insulin sensitivity and body composition	[34,35]
	Treatment of oxidative stress during aging	Increased synthesis of glutathione and decreases oxidative stress levels
l-Cysteine + glycine + dithreonine	Treatment of hypostatic ulcer	Reduced pain and improved degree of ulcer healing	[36]
l-Cysteine + vitamin D	Treatment of patients with type-2 diabetes	Increased levels of glutathione and decreased levels of triglycerides	[33]
l-Cysteine + basic fibroblast growth factor (bFCF)	Treatment of corneal epithelium after photoreactive keratectomy in patients affected by myopia	Reduced time of resurfacing corneal.	[37]
l-Cysteine + theanine	Improvement of well-trained athletes’ performance	Restoration of the attenuation of the activity of Natural Killer cells	[38]