How to Reconstitute Peptides

What Reconstitution Is

You add liquid to freeze-dried peptide powder so you can measure doses. Injection, topical cream, and nasal spray all start here for most compounds. Powder is stable. Liquid isn't. Once mixed, the clock starts.

The physical process is simple. What catches people is the concentration: total peptide divided by total liquid equals how much peptide sits in each millilitre. That number drives every dose calculation after.

What You Need

Peptide vial

Lyophilized powder in a glass vial with rubber stopper and crimp cap. Label shows name and total amount (e.g. "BPC-157 5mg"). Don't peel the cap. Needle goes through the stopper.

BAC water

Sterile water with 0.9% benzyl alcohol. Standard diluent. Preservative lets you puncture the vial repeatedly over ~25–30 days without the solution going off immediately.

Syringes

One syringe to add water. Fresh syringe every time you draw a dose. U-100, 1 mL, 29G or 30G is the usual starting point.

Alcohol swabs

70% isopropyl pads. Swab every stopper before every needle entry. Non-negotiable for multi-dose vials.

Sharps container

Dispose used needles properly. Don't recap and reuse insulin syringes.

Pick Your Diluent

BAC water (default)

Use this unless a specific protocol says otherwise. Preservative supports multi-dose use over weeks when refrigerated.

Sterile water (single use)

No preservative. Once punctured, bacteria can grow. Treat the whole vial as a 24–48 hour product unless you're using it all in one or two doses.

Normal saline (0.9% NaCl)

Some clinical protocols specify saline. For most research peptides, BAC is the better default. Nasal protocols often add saline after reconstitution as a separate dilution step.

How Much BAC Water

More water = lower concentration = larger draw volume per dose. Less water = higher concentration = smaller draws (harder to measure accurately).

Common volumes

• 1 mL: tight concentration, good for small vials and microgram dosing
• 2 mL: the sweet spot for most 5–10 mg vials
• 3 mL: larger vials or when you want smaller unit draws
• 5 mL: uncommon for DIY research, more clinical scale

Our protocol pages pick volumes that keep the math clean. Custom amounts: use the Calculator.

Step by Step

1. 1

   Clean workspace, clean hands

   Flat surface. Gloves optional but hands washed either way.

2. 2

   Swab both stoppers

   BAC vial first, peptide vial second. Let dry.

3. 3

   Draw BAC into syringe

   Pull slow. Pop air bubbles. Confirm volume.

4. 4

   Inject into peptide vial

   Needle aimed at the glass wall, not the powder cake. Depress plunger slowly.

5. 5

   Let it dissolve

   Swirl gently. No shaking. Clear solution usually within 1–3 minutes.

6. 6

   Inspect

   Should be clear, no chunks. Slight foam on top is common and settles.

7. 7

   Label and fridge

   Date + BAC volume on tape. Refrigerate now.

Drawing a Dose

1. Fresh alcohol swab on stopper.
2. New syringe. Pull plunger back to draw air equal to your target volume.
3. Insert needle, inject air into vial (pressure equalization).
4. Flip vial upside down. Needle tip in liquid.
5. Pull plunger to your calculated units.
6. Flick bubbles up, push tiny bit out if needed, confirm reading at plunger top edge.
7. Remove syringe. Dose ready for whatever route your protocol specifies.

The Math

Always the same:

Dose volume (mL) = Target dose (mg) ÷ Concentration (mg/mL)
Syringe units (U-100) = Dose volume (mL) × 100

BPC-157, 5 mg vial, 2 mL BAC

2.5 mg/mL. Dose 250 mcg (0.25 mg). Volume 0.10 mL = 10 units. Twenty doses in the vial.

Semaglutide, 3 mg vial, 3 mL BAC

1.0 mg/mL. Dose 0.25 mg. Volume 0.25 mL = 25 units. Twelve doses.

CJC/Ipamorelin blend, 10 mg, 2 mL BAC

5.0 mg/mL total. Dose 300 mcg (0.3 mg). Volume 0.06 mL = 6 units.

HGH, 10 IU vial, 1 mL BAC

10 IU/mL. Dose 2 IU. Volume 0.20 mL = 20 units. Five doses.

Special Cases

Blends

Same mixing process. Math uses total peptide mass in the vial. Every dose delivers a fixed ratio. You can't change individual peptide amounts after mixing. That's what stacks are for.

IU-labelled vials (HGH, HCG)

Concentration in IU/mL, not mg/mL. HGH rough conversion ~3 IU per 1 mg. Always read the specific vial label.

Small vials (1–2 mg)

Often reconstituted with 0.5–1 mL. A 0.5 mL syringe barrel can be easier to read for tiny draws.

Large vials (20 mg+)

More BAC (2–5 mL). Dissolution may take a few extra minutes. Same rules otherwise.

Mistakes to Avoid

When Something Looks Off

Won't dissolve

Wait up to 10 minutes. Gentle swirl every minute or two. Confirm BAC water, not wrong diluent.

Cloudy

Brief haze that clears is sometimes normal. Still cloudy after 15 minutes? Don't use it.

Color

Should be clear. Faint yellow can happen on some peptides. Strong color = discard.

Added wrong BAC volume

Not fatal. New concentration = total mg ÷ actual mL. Recalculate with the Calculator.

Foam on top

Usually harmless. Let it settle. Draw from below the foam line.

After You Mix

• Fridge at 2–8°C immediately
• ~25–30 days with BAC water under normal use
• Upright, out of light
• Never freeze liquid peptide
• Label date and BAC volume. Discard after 30 days even if it looks fine.

Full storage breakdown: Storage Guide.

Checklist

1. Hands clean. Supplies laid out.
2. Swab BAC stopper, then peptide stopper.
3. Draw correct BAC volume.
4. Inject down glass wall, slow.
5. Swirl until clear. No shaking.
6. Label: peptide name, date, BAC mL.
7. Refrigerate. Use within 25–30 days.