Cysteine is instead the precursor of glutathione
A study has analyzed how plasma DPP-4 activity and levels of soluble DPP-4 correlate with inflammatory markers (C-reactive protein [CRP], IL-6, TNF-, and monocyte chemoattractant protein-1 [MCP-1]) in a subset of patients with T2DM treated with sitagliptin for 12 months as part of the Trial Evaluating Cardiovascular Outcomes with Sitagliptin (TECOS, 26)
I work on taking emerging drugs into the first stages of clinical trial testing
Your clinician should tailor this to your situation and, importantly, to the underlying cause of deficiency (dietary vs non-dietary)
Determine global period status

Dietary modifications that help: Eat smaller, more frequent meals instead of large ones Prioritize protein-forward meals, as protein is easier to digest when gastric emptying is slowed Avoid high-fat meals, which take longer to digest and can worsen nausea Eat slowly and stop before you feel full, as the sensation of fullness hits faster on retatrutide Stay hydrated with slow, steady sipping rather than drinking large amounts at once Timing strategies: Take your weekly injection at a consistent time each week Many researchers prefer evening injections so that the peak nausea period occurs during sleep Plan your dose increase days on weekends or rest days when GI symptoms are less disruptive Stay upright for at least 30 minutes after eating, as gravity helps with digestion when gastric emptying is slowed Natural remedies for mild nausea: Ginger has demonstrated anti-nausea properties in multiple studies and can help manage mild GI symptoms during dose transitions