l carnitine lower creatinine History of L-carnitine: Implications for renal disease Equate Creatine Monohydrate Dietary Supplement

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Farr JN, Xu M, Weivoda MM, Monroe DG, Fraser DG, Onken JL, Negley BA, Sfeir JG, Ogrodnik MB, Hachfeld CM, LeBrasseur NK, Drake MT, Pignolo RJ, Pirtskhalava T, Tchkonia T, Oursler MJ, Kirkland JL, Khosla S

Also, they prevent the excess breakdown of skin proteins

Janelidze S, Hertze J, Ngga K, Nilsson K, Swedish BioFINDER Study Group, Nilsson C, Wennstrm M, van Westen D, Blennow K, Zetterberg H, Hansson O (2017) Increased blood-brain barrier permeability is associated with dementia and diabetes but not amyloid pathology or APOE genotype