How much bacteriostatic water for a 20 mg Crystagen vial?

The amount of water does not change how much Crystagen is in the vial; it sets the concentration. With 1 mL a 20 mg vial is 20 mg/mL, with 2 mL it is 10 mg/mL and with 3 mL it is 6.667 mg/mL. More water makes each unit weaker, so a given amount takes more units to draw.

How many mcg are in one unit of a 20 mg Crystagen vial?

With 2 mL of water, one unit on a U-100 syringe holds 100 mcg (10,000 mcg per mL divided by 100). The table above gives the figure for other vial sizes and volumes.

Is this a Crystagen dosage calculator?

It converts between amounts, volumes and syringe units for Crystagen; it does not suggest how much to use. The Crystagen guide lists the doses used in published studies, with their sources.

What size are Crystagen vials?

Across 45 listings in our directory, the most common sizes are 20 mg, 50 mg, 10 mg, 5 mg. Sizes and prices by store are on the Crystagen price page.

How many units are in 1 mL on an insulin syringe?

A U-100 insulin syringe holds 100 units per mL, so 1 unit is 0.01 mL.

Tool · Crystagen reconstitution arithmetic

Crystagen dosage calculator

Pick a Crystagen vial size, enter the bacteriostatic water added and, if you want, an amount per draw. The calculator gives the concentration and how many units that is on a U-100 insulin syringe. It does arithmetic only and does not suggest an amount.

U-100 syringes · 100 units = 1 mL · 1 mg = 1,000 mcg

Concentration

10 mg/mL

100 mcg per unit on a U-100 syringe · 1,000 mcg per 0.1 mL

Enter an amount per draw to see how many units it is and how many draws the vial holds.

Not medical advice

This tool converts between amounts, volumes and syringe units. It is not a recommendation to use Crystagen or a guide to how much to use, and it cannot tell you whether a product is what its label says. For the amounts used in research, with sources, see the doses used in published Crystagen studies. Disclaimer

Crystagen vial sizes stores list

From 45 active Crystagen listings of 100 mg or less in our directory. The buttons above use these sizes.

20 mg27 listings
50 mg6 listings
10 mg4 listings
5 mg3 listings
25 mg2 listings
100 mg2 listings

Compare Crystagen prices by supplier

Worked example

A 20 mg Crystagen vial with 2 mL of bacteriostatic water is 10 mg/mL (10,000 mcg/mL). One unit on a U-100 syringe is 0.01 mL, so each unit holds 100 mcg. To find how many units an amount is, divide the amount in mcg by 100.

Read more about bacteriostatic water and storing a mixed vial, or the Crystagen guide.

Crystagen concentration by vial size and water added

mcg per unit on a U-100 syringe. Read across for more water, down for a larger vial.

Vial	1 mL water	2 mL water	3 mL water
5 mg	50 mcg/unit · 5 mg/mL	25 mcg/unit · 2.5 mg/mL	16.7 mcg/unit · 1.67 mg/mL
10 mg	100 mcg/unit · 10 mg/mL	50 mcg/unit · 5 mg/mL	33.3 mcg/unit · 3.33 mg/mL
20 mg	200 mcg/unit · 20 mg/mL	100 mcg/unit · 10 mg/mL	66.7 mcg/unit · 6.67 mg/mL
25 mg	250 mcg/unit · 25 mg/mL	125 mcg/unit · 12.5 mg/mL	83.3 mcg/unit · 8.33 mg/mL
50 mg	500 mcg/unit · 50 mg/mL	250 mcg/unit · 25 mg/mL	166.7 mcg/unit · 16.67 mg/mL
100 mg	1,000 mcg/unit · 100 mg/mL	500 mcg/unit · 50 mg/mL	333.3 mcg/unit · 33.33 mg/mL

Questions

How much bacteriostatic water for a 20 mg Crystagen vial?: The amount of water does not change how much Crystagen is in the vial; it sets the concentration. With 1 mL a 20 mg vial is 20 mg/mL, with 2 mL it is 10 mg/mL and with 3 mL it is 6.667 mg/mL. More water makes each unit weaker, so a given amount takes more units to draw.
How many mcg are in one unit of a 20 mg Crystagen vial?: With 2 mL of water, one unit on a U-100 syringe holds 100 mcg (10,000 mcg per mL divided by 100). The table above gives the figure for other vial sizes and volumes.
Is this a Crystagen dosage calculator?: It converts between amounts, volumes and syringe units for Crystagen; it does not suggest how much to use. The Crystagen guide lists the doses used in published studies, with their sources.
What size are Crystagen vials?: Across 45 listings in our directory, the most common sizes are 20 mg, 50 mg, 10 mg, 5 mg. Sizes and prices by store are on the Crystagen price page.
How many units are in 1 mL on an insulin syringe?: A U-100 insulin syringe holds 100 units per mL, so 1 unit is 0.01 mL.

Working with a different product? Use the general peptide calculator.