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Banks and Kastin reported that radiolabeled DSIP administered peripherally produced detectable DSIP-like immunoreactivity in brain tissue at levels above what non-specific leakage would predict, and that the modified analogue [D-Ala3]-DSIP entered brain at substantially higher levels than the parent compound after intracarotid administration (Banks & Kastin, 1981)

No such claim can be made

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It has also created a cultural moment in which the public conflates "peptide" with "effective" without the scientific scaffolding that makes GLP-1 drugs credible

It can increase your chance of having serious side effects including serious infections, cancer, serious allergic reactions, lung inflammation, and a rare condition called posterior reversible encephalopathy syndrome
Archaea (2005)