Question 1

What is BAC water and where do I get it?

Accepted Answer

Bacteriostatic water (BAC water) contains 0.9% benzyl alcohol to prevent microbial growth, keeping reconstituted peptides stable for 28–60 days refrigerated. It is available from compounding pharmacies with a prescription. Never use tap water, saline, or plain sterile water for peptide reconstitution.

Question 2

What size insulin syringe should I use for peptides?

Accepted Answer

Most peptide users prefer 1mL/100-unit insulin syringes with a 28–31 gauge, 5/16" (8mm) needle for subcutaneous injections. 50-unit syringes are useful for smaller doses as the markings are easier to read precisely.

Question 3

How long is a reconstituted peptide stable?

Accepted Answer

Most peptides reconstituted with bacteriostatic water (BAC water) and stored refrigerated at 2–8°C are stable for 28–60 days. Keep away from light. Do not freeze reconstituted peptides. Unreconstituted lyophilized peptides stored in a freezer can last 1–2 years.

Question 4

What is the difference between mcg and mg for peptides?

Accepted Answer

1 milligram (mg) = 1,000 micrograms (mcg). Vial sizes are expressed in mg (e.g. 5mg BPC-157 = 5,000mcg total). Individual doses are expressed in mcg (e.g. 250mcg per injection). This conversion is one of the most common sources of dosing errors.

Question 5

How do I know if my peptide protocol is working?

Accepted Answer

The only objective measure is blood work. Track IGF-1 for growth hormone peptides like tesamorelin, LH and testosterone for enclomiphene, ApoB for metabolic protocols, and hs-CRP for inflammation markers. MyProtocolStack tracks 40+ biomarkers and connects them directly to your protocol.

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