Short answer
Most peptide products are stable as freeze-dried powder and fragile once mixed with liquid. Reconstitution turns a shelf-stable vial into a perishable one, and every amount drawn afterward depends on the concentration you created.
Why peptides ship lyophilized
Freeze-drying removes water, which is where most peptide degradation happens. Dry vials tolerate shipping and room-temperature storage far better than solutions do.
What changes after you add liquid
Once reconstituted, the clock starts. Refrigeration slows degradation, and pharmacy and community practice generally treats a multi-dose vial as about a 28-day supply. Heat, light, and repeated warming cycles all accelerate breakdown.
Why bacteriostatic water is the default
Bacteriostatic water contains a small amount of benzyl alcohol that inhibits bacterial growth across multiple withdrawals from the same vial. Plain sterile water is treated as single-use by convention.
The concentration you created is the amount you get
Adding 2 mL to a 10 mg vial makes a 5 mg/mL solution; every draw afterward is arithmetic on that number. The reconstitution calculator on this site converts vial amounts, water volumes, and U-100 syringe units.
Storage mistakes that quietly ruin vials
Freezing a reconstituted solution unless the specific product allows it, leaving vials in cars or on counters, and using a solution that has turned cloudy or shows particles. A visibly wrong solution is a discard, not a dose.
Sources
- 1.
FDA. FDA to Compounders: Know Your Bulks and Excipients Suppliers 2026.
Accessed 2026-06-09.
FDA supplier-quality guidance for compounders; used for product-quality context, not as evidence of NAD+ efficacy or route instructions.
- 2.
FDA. Compounding and the FDA: Questions and Answers 2026.
Accessed 2026-06-08.
FDA explains that compounded drugs are not FDA-approved and that FDA does not verify their safety, effectiveness, or quality before marketing.