alex3619
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The somewhat arbitrary divide between a peptide and a protein is about 50 amino acids, so they can be quite complex too.A "peptide" is just two or more amino acids
Here the use of peptides often requires medical approval: (infomercial site warning) https://www.peptideclinics.com.au/buy-peptides-online-australia/
Further, if they are trying to alter brain receptor function in a targeted fashion its not being used as a supplement, but as a drug. So the question arises as to the mode of action. Is it targeted to a specific receptor with high specificity, or is it a broad acting supplement? More likely its in between, and I would expect the FDA to get interested unless its a simple common peptide that is well understood.