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Someone mixed a powdered peptide called Selank into a bottle using bacteriostatic (BAC) water and plans to use it as a nasal spray. After making a solution that delivers about 200 micrograms per 0.1 mL spray, they were told by others that BAC water is a poor choice for the nose because it contains benzyl alcohol. They’re asking whether that was a mistake or fine. Selank is a short synthetic peptide developed in Russia that’s sometimes used as a mood or anxiety aid and for cognitive effects in experimental settings. Think of a peptide as a tiny chunk of a protein that can interact with the body in specific ways. Selank is not an everyday over‑the‑counter nasal medicine, and it’s mainly found in research papers and niche use rather than broad clinical approval. It’s typically administered as a nasal spray in the research or self‑use community because that’s one route to get it into the system quickly. Bacteriostatic water is sterile water that contains a small amount of benzyl alcohol to stop bacteria from growing in multi‑dose vials. It’s commonly used to reconstitute medications that will be used more than once, allowing repeated withdrawals without contaminating the remainder. The concern people raised is that benzyl alcohol can irritate mucous membranes (the lining inside your nose) in some people, and nasal tissue is more sensitive than skin or muscle. Most medical guidelines recommend using normal sterile saline (0.9% salt solution) for intranasal use because it matches the saltiness of body fluids and is gentle on mucous membranes. What the practical evidence shows is mixed and thin. Benzyl alcohol in the concentrations used in bacteriostatic water has a long track record for disinfecting multi‑dose vials for injections, and many medications are routinely reconstituted with it for repeated parenteral (injected) use. However, there’s limited published data specifically about repeated intranasal exposure to benzyl alcohol in adults. Anecdotally, some people report stinging, irritation, or dryness when benzyl alcohol‑containing water is used in the nose; others tolerate it fine. This isn’t a large, rigorously studied situation: it’s mostly small reports, product warnings, and common‑sense recommendations from clinicians. For a regular person considering safety: if you already used BAC water once and felt no stinging, bleeding, or persistent discomfort, a single exposure is unlikely to cause serious harm. If you plan repeated intranasal use, sterile saline (0.9% sodium chloride) is the safer, more standard choice because it’s designed for the nose and doesn’t contain benzyl alcohol. People with sensitive nasal passages, chronic nasal conditions, or allergies might be more prone to irritation and should avoid BAC water for nasal sprays. Also, if the peptide isn’t prescribed or regulated where you live, there are extra risks around dosing, sterility, and product quality. Bottom line: Using bacteriostatic water once by accident is probably not catastrophic, but for planned, repeated nasal spraying it’s wiser and gentler to use sterile saline designed for intranasal use.
Source: r/Peptides