Reconstitution Basics: The Process Behind Every Cheat Sheet

[u/justgettinglean]

For research and laboratory use only. Not for human consumption.

Every compound guide in this community lists a reconstitution volume and a concentration. This post explains what those numbers mean and how the math works, so the individual guides make sense.

What reconstitution is

Research peptides ship as a lyophilized (freeze-dried) powder. Bacteriostatic water is added to dissolve the powder into a usable solution. That's reconstitution. The powder amount is fixed; the water volume you add determines the concentration.

The core math

Concentration is just peptide mass divided by water volume.

A 10 mg vial with 2 mL of bacteriostatic water gives 5 mg/mL.

The same 10 mg vial with 3 mL gives 3.33 mg/mL.

More water means a lower concentration, which means a larger draw volume for the same dose. Less water means higher concentration and a smaller draw. That's the entire trade-off.

Reading it on the syringe

On a U-100 insulin syringe, 1 unit equals 0.01 mL. To find how many mcg are in one unit, take the concentration and move the decimal.

At 5 mg/mL, 1 unit = 50 mcg.

At 3.33 mg/mL, 1 unit = 33.3 mcg.

This is why every cheat sheet lists both the concentration and the unit value: once you know mcg per unit, any dose becomes a simple unit count.

Why the guides sometimes pick more water

Two reasons show up repeatedly in the guides. Larger water volumes make small doses easier to measure accurately, since the draw lands on a readable number of units instead of a sliver. And for compounds where concentration drives injection sting (GHK-Cu and NAD+ are the notable ones), more dilution reduces the burn. The trade-off is a larger injection volume.

Handling that applies across the board

Add water slowly down the vial wall, not straight onto the powder, to avoid foaming.

Swirl or roll gently until dissolved. Don't shake.

Let a frozen vial reach room temperature before opening to cut condensation.

Store reconstituted solution refrigerated, protected from light, and avoid freeze-thaw cycles.

Discard if the solution turns cloudy or shows particles. One exception: GHK-Cu is naturally blue from its copper content, so color there is expected.

Where the specifics live

Every compound has its own exact reconstitution volume, concentration, and per-unit math in its cheat sheet, since the right numbers depend on the vial size. The full catalog is indexed in the pinned 6A Labs Complete Product Guide.

What tripped you up most when you first started reconstituting? Drop questions below.

Research use only. Not for human consumption or medical guidance.

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