🥇 1. Sterile 0.9% Saline (Isotonic Saline) (Sodium Chloride)
Best overall choice for nasal sprays
Why it’s ideal:
- Matches the body’s natural salt concentration
- Gentle on nasal mucosa
- Reduces burning and irritation
- Better comfort for daily use
- Helps maintain tissue hydration
✔️ Most comfortable
✔️ Most physiologically appropriate
✔️ Preferred for repeated intranasal use
If someone complains about “spicy nose,” saline usually fixes that.
🥈2. Sterile Water (Plain, No Preservative)
Better than BAC — but still not ideal alone.
Why:
- No preservative (less irritation)
- But not isotonic
- Can still sting
- Doesn’t protect from contamination once opened
Often used if saline isn’t available — but not first choice.
🥉 3. Bacteriostatic Water (BAC Water)
Common for injections — not ideal for nasal sprays
Why:
- Contains benzyl alcohol (preservative)
- Can cause nasal burning
- Can dry out mucosa
- Not isotonic
⚠️ Fine for subcutaneous injection
⚠️ Not comfortable for intranasal daily use
Some people tolerate it, but many report irritation.
🚫 What NOT to Use for Nasal Reconstitution
- ❌ DMSO
- ❌ Oils
- ❌ Tap water (even filtered)
- ❌ Anything non-sterile
- ❌ Strong alcohol-based preservatives
The nasal cavity absorbs directly toward the brain — sterility and proper formulation are critical.
🧠 For Peptide Nasal Sprays Specifically
If you’re formulating something like:
➡️ Sterile isotonic saline is generally the most comfortable and appropriate base.
Some advanced formulations also include:
- Buffered saline (pH adjusted)
- Mild absorption enhancers (in professional compounding settings)
Bottom Line
🥇 Best overall: Sterile 0.9% saline
🥈 Acceptable (but may burn): Sterile water
🥉 Least ideal for nasal use: BAC water