is glutathione the master endogenous antioxidant Antioxidant? Here’s What Science Says Frontiers | Antioxidant and Oxidative

(6) M Moon, H G Kim, L Hwang, et al (2009) Neuroprotective effect of ghrelin in the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine mouse model of Parkinsons disease by blocking microglial activation Neurotoxicity Research, 2009 May, Volume 15 (Issue 4), Pages 332-47

But while Rogan is best known for being open and honest on his own podcast, The Joe Rogan Experience, Rogans comments come from being a guest on the Flagrant 2 podcast

The Growth Hormone Secretagogue Mechanism Growth hormone-releasing peptides are synthetic compounds that mimic ghrelin a 28-amino-acid gut peptide that drives GH secretion by binding the growth hormone secretagogue receptor type 1a (GHSR-1a)

returns to baseline within 2-3 hours Appetite stimulation -- ghrelin mimetic effect, peaks 20-30 min post-injection