after reading the comments... no, you do not have to be as thorough with sterility as you may think when it comes to nasal sprays. your nose is breathing in bacteria all day long. that's part of it's function. so forget about that hazmat suit when you're just making a simple spray for your test rat. it's overkill.

@MyB be more specific with your question.

you can just look up the Molecular Weight (Da) of any peptide online yourself.

Peptide Approx. Molecular Weight (Da)
examples:

Glutathione ~307
Noopept ~251
KPV ~400
Pinealon ~404
Epithalon ~488
Semax ~751
Selank ~752
TB-500 (fragment) ~889
GHK-CU ~909
AHK-CU ~900-950
PE-22-28 ~900 (estimated)
DSIP ~1,000 (borderline)

Just to be clear: peptides that are >1000 Daltons can still be made to work in spray form like Melanotan II ~1,024 (Da) but they need permeation enhancers to be effective.

you can't just use BAC water on any peptide mix it up and spray expecting results.

the closer you get to 1000 the less effective they will be.
Pinealon, Epithalon, Semax and Selank are widely "researched" intranasally because of their low molecular weight.

well i'm not saying that it isn't also marketing. that's obvious and its working for them. like selling bottled water... everyone is arguably selling the same product.

i agree. but no need for overkill like you would with subQ