l carnitina vs creatina Creatine Carnitine: Do You Need Both? Differences Explained Creatinine vs Creatine | Simple
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USA 106 , 1565115656 (2009)

They are designed to support specific systems such as blood flow, neural signaling, energy metabolism, or antioxidant defense rather than replace or suppress hormones

First, long-term safety requires further characterization

[DOI] [PMC free article] [PubMed] [Google Scholar] 253.Yu Z, Sun D, Feng J, Tan W, Fang X, Zhao M, Zhao X, Pu Y, Huang A, Xiang Z, et al

Multiple metabolic reactions in the body are needed to convert NAC into glutathione

And here is the finding that changes the entire conversation: that 16% risk was, in the authors words, strongly modified by folate status [5]