18+ · Research Use Only · Not for Human Consumption
Bacteriostatic water in the Philippines: the missing reagent.
Every lyophilized peptide needs it, almost no pharmacy stocks it. What bacteriostatic water is, why plain sterile water is not a substitute, and where to actually get it locally.
The pharmacy dead end
Ask for bacteriostatic water at a Mercury Drug counter and you will usually get one of two things: a blank look, or single-use ampoules of sterile water for injection. Neither solves the problem. Bacteriostatic water is a laboratory reagent, not a consumer pharmacy product, and in the Philippines it effectively only moves through research suppliers.
Why the benzyl alcohol matters
The 0.9% benzyl alcohol in bacteriostatic water inhibits microbial growth inside the vial, which is what makes repeated draws from one vial workable over roughly 28 days. Plain sterile water has no preservative: once a needle enters the vial, the clock on contamination starts immediately. Since lyophilized peptides are reconstituted once and then drawn from many times across a research protocol, the preserved reagent is the one the protocols specify.
The local answer: ₱250, same day
Primara Labs stocks 30ml bacteriostatic water vials at ₱250 flat, shipped from Metro Manila stock alongside any peptide order or on their own. One 30ml vial covers many reconstitutions, since a typical 10mg peptide vial takes 1 to 2 ml. It is the one item in the catalogue excluded from the first-order discount, priced as a reagent rather than a research compound.
Supplied for laboratory research use only. Nothing on this page is medical advice.
Bacteriostatic water questions
Where can I buy bacteriostatic water in the Philippines?
Retail pharmacies like Mercury Drug and Watsons rarely stock bacteriostatic water, since it is a laboratory reagent rather than a consumer product. Research suppliers are the practical source. Primara Labs stocks 30ml vials at ₱250 and ships them same day across Metro Manila alongside any order.
Does Mercury Drug sell bacteriostatic water?
Not reliably. Mercury Drug stocks sterile water for injection in single-use ampoules, which is unpreserved and not a substitute for multi-draw laboratory work. Bacteriostatic water with 0.9% benzyl alcohol is generally only available through research suppliers in the Philippines.
What is the difference between sterile water and bacteriostatic water?
Sterile water for injection is unpreserved and intended for single use, since anything that enters the vial can grow. Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits microbial growth and permits repeated draws from one vial over roughly 28 days. Research protocols specify bacteriostatic water for peptide reconstitution for exactly this reason.
How much bacteriostatic water do I need per peptide vial?
Reconstituting a typical 10mg lyophilized peptide vial uses 1 to 2 ml, so a single 30ml vial covers many reconstitutions. Most research orders include one or two 30ml vials.
How should bacteriostatic water be stored?
Store at room temperature before first use. After the first draw, refrigerate the vial and discard it after 28 days.