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Retatrutides triple agonism may extend these protective effects through glucagon-mediated pathways, though dedicated renal outcome data specific to retatrutide are not yet published as of the time of this guide

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Brain Sci 13:272 Santos-Garca D, Macas M, Llaneza M, Grande M, De La Fuente-Fernndez R (2011) Serum vitamin B 12 and folate levels in Parkinsons disease patients treated with duodenal levodopa infusion

Regarding plasma B12 - this is not the case, serum B12 often remains highly elevated (well over the normal range) even while symptoms return - this is why testing B12 once treatment begins is not recommended