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A transient increase in heart rate has been reported in retatrutide clinical trials

Cysteine is the rate-limiting constituent in the production of reduced glutathione, and it can be replaced by its precursor NAC
[Google Scholar] 58.Berdal M., Appelbom H.I., Eikrem J.H., Lund A., Zykova S., Busund L.T., Seljelid R., Jenssen T