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A small but interesting study of recreational athletes using collagen peptides found a 79% reduction in joint pain during activity after 12 weeks

77 A Cochrane review of the use of NAC in children with respiratory infections evaluated the safety data from 34 clinical trials, involving 2064 children, and found NAC to be safe, although the authors note that 59 cases of paradoxically increased bronchorrhoea (increased sputum production) in infants under the age of 2 years were reported to the French pharmacovigilance system

Various topical, oral, and injection-based cosmetic skin-lightening agents with different mechanisms of action are used widely across Asia, including hydroquinone, azelaic acid, kojic acid, mulberry, alpha-arbutin, beta-arbutin, glutathione, licorice root, papaya, vitamin A (e.g., retinol), vitamin B (i.e., niacinamide), and vitamin C

GHK-Cu may promote mucosal healing and enhance tight junction protein expression by regulating the SIRT1/STAT3 pathway