oral glutathione supplementation randomized trial increases glutathione levels with liposomal elevates body stores of and markers of immune function Frontiers | Glutathione: A Samsonian
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10.3390/ijms21186517 270

CrossRef CDX-2 Protein and mRNA Expression in Canine Intestinal Adenocarcinoma Seung-Hee Cho, Byung-Joon Seung, Soo-Hyeon Kim, Min-Kyung Bae, Ha-Young Lim, Jung-Hyang Sur Journal of Comparative Pathology.2021

In the gastrointestinal tract, SP is derived from immune cells, epithelial cells, and enteric neurons [24, 53]

So you get that baroreflex dipping, which is part of the parasympathetic activation
