Hexarelin Reconstitution: How Much Bacteriostatic Water
A 2 mg vial of Hexarelin reconstituted with 2 mL of bacteriostatic water gives 1000 mcg/mL (1 mg/mL); a 5 mg vial with 2 mL gives 2500 mcg/mL. The calculation depends only on the quantity in the vial and the volume of water added, so the figures below apply to any Hexarelin vial of those sizes. Concentrations are given in mcg because the amounts involved are small.
There is no single correct volume. Adding more water does not change how much is in the vial. It spreads the same quantity through a larger volume, which changes how many syringe units correspond to a given amount. The tables on this page use volumes that produce round numbers on a U-100 syringe; other volumes work identically as long as the resulting concentration is written on the vial.
Peptide reconstitution calculator
Set to this vial below. Change the vial size, water volume, amount or syringe and it recalculates the concentration and the syringe units. For laboratory research use only.
All products are sold strictly for laboratory research use only and are not for human or veterinary consumption. This calculator is provided as a general reference tool.
How much bacteriostatic water for 2 mg Hexarelin?
A 2 mg Hexarelin vial is commonly reconstituted with 2 mL of bacteriostatic water, which gives 1000 mcg/mL; 1 mL gives 2000 mcg/mL and 4 mL gives 500 mcg/mL. At 1000 mcg/mL each 0.1 mL of solution contains 100 mcg.
| Water added | Concentration | Amount in 0.1 mL (10 units on a U-100 syringe) |
|---|---|---|
| 1 mL | 2000 mcg/mL | 200 mcg |
| 2 mL | 1000 mcg/mL | 100 mcg |
| 4 mL | 500 mcg/mL | 50 mcg |
How much bacteriostatic water for 5 mg Hexarelin?
A 5 mg Hexarelin vial is commonly reconstituted with 2 mL of bacteriostatic water, which gives 2500 mcg/mL; 1 mL gives 5000 mcg/mL, 2.5 mL gives 2000 mcg/mL and 5 mL gives 1000 mcg/mL. At 2500 mcg/mL each 0.1 mL of solution contains 250 mcg.
| Water added | Concentration | Amount in 0.1 mL (10 units on a U-100 syringe) |
|---|---|---|
| 1 mL | 5000 mcg/mL | 500 mcg |
| 2 mL | 2500 mcg/mL | 250 mcg |
| 2.5 mL | 2000 mcg/mL | 200 mcg |
| 5 mL | 1000 mcg/mL | 100 mcg |
For any other volume, the calculator on this page works out the concentration. Before choosing a larger volume, check that the vial has headspace for it. One multi-dose vial of bacteriostatic water covers several research vials.
Reading the concentration on a U-100 syringe
A U-100 insulin syringe is graduated in units, and 100 units equal 1 mL. Units are therefore millilitres multiplied by 100: 0.1 mL is 10 units and 0.25 mL is 25 units. A 0.5 mL syringe carries 50 units and a 0.3 mL syringe carries 30 units on the same scale, with finer markings that make small volumes easier to read.
To find the volume that contains a given amount, divide the amount by the concentration. At 1000 mcg/mL (a 2 mg vial with 2 mL of water), the volume that contains 100 mcg is 100 divided by 1000, which is 0.1 mL, or 10 units. The table below runs the same calculation for four arbitrary amounts. They illustrate the arithmetic and nothing else.
| Amount (illustrative) | Volume at 1000 mcg/mL | U-100 units |
|---|---|---|
| 20 mcg | 0.02 mL | 2 units |
| 50 mcg | 0.05 mL | 5 units |
| 100 mcg | 0.1 mL | 10 units |
| 200 mcg | 0.2 mL | 20 units |
Volumes below about 0.1 mL are hard to read accurately on a 1 mL syringe. Either move to a 0.3 mL or 0.5 mL syringe, or reconstitute with more water so that the same mass occupies a larger, more legible volume.
Hexarelin is described here as a lyophilised material for laboratory research use only. The quantities on this page illustrate the arithmetic of dilution and measurement only.
The Hexarelin vial
Hexarelin is commonly supplied in research catalogues as 2 mg and 5 mg lyophilised vials. Vistara Labs does not currently stock Hexarelin, but you can request it: contact us and we will source it for you. The calculator on this page works for any vial. For a growth hormone secretagogue we do carry, see CJC-1295 with Ipamorelin.
What Hexarelin is
Hexarelin is a synthetic hexapeptide growth hormone secretagogue. Growth hormone releasing peptides have specific receptors in the heart as well as the pituitary and hypothalamus, which is why much of the human research on Hexarelin is cardiac.
- In 12 healthy young volunteers, Hexarelin produced a growth hormone response about twice that of GHRH, and the response was highly reproducible on repeat testing (Ghigo et al., 1994).
- In adults with growth hormone deficiency and in matched controls, Hexarelin raised left ventricular ejection fraction in both groups, an effect the authors attribute to cardiac receptors rather than growth hormone (Bisi et al., 1999).
- In 24 men with coronary artery disease undergoing bypass surgery, Hexarelin promptly increased ejection fraction, cardiac index and cardiac output for up to 90 minutes, while GHRH and recombinant growth hormone did not (Broglio et al., 2002).
Reconstitution technique
Let the vial reach room temperature, swab both stoppers, and run the measured water slowly down the inside wall of the vial rather than onto the powder. Swirl or tilt gently until the cake dissolves, never shake, and give any remaining powder a few minutes to settle into solution. Label the vial with the date and the concentration, then keep it refrigerated at 2 to 8 °C and protected from light. The full method, with the reason behind each step, is in how to reconstitute peptides with bacteriostatic water.
Why the solution should look clear
Properly reconstituted Hexarelin forms a clear, colourless solution. Cloudiness, strands or a gel that will not disperse usually mean the water went in too fast or the vial was shaken; haze that appears later points to warm or bright storage. The causes are covered in why peptides gel or go cloudy.
Bacteriostatic water, not sterile water
Bacteriostatic water is sterile water with 0.9% benzyl alcohol, a preservative that allows a refrigerated vial to be accessed more than once; plain sterile water is intended for single access. The difference is explained in bacteriostatic water explained.
Frequently asked questions
How much bac water for a 2 mg Hexarelin vial?
A 2 mg Hexarelin vial is commonly reconstituted with 2 mL of bacteriostatic water, which gives 1000 mcg/mL; 4 mL gives 500 mcg/mL. At 1000 mcg/mL each 0.1 mL (10 units on a U-100 syringe) contains 100 mcg.
How much bac water for a 5 mg Hexarelin vial?
A 5 mg Hexarelin vial is commonly reconstituted with 2 mL of bacteriostatic water, which gives 2500 mcg/mL; 5 mL gives 1000 mcg/mL. At 2500 mcg/mL each 0.1 mL (10 units on a U-100 syringe) contains 250 mcg.
How many units on a U-100 syringe contain 100 mcg at 1000 mcg/mL?
At 1000 mcg/mL (a 2 mg vial with 2 mL of water), the volume that contains 100 mcg is 100 divided by 1000, which is 0.1 mL, or 10 units. Units are millilitres multiplied by 100, so 0.1 mL is 10 units. The amounts on this page illustrate the arithmetic only.
What should reconstituted Hexarelin look like?
Properly reconstituted Hexarelin forms a clear, colourless solution. Cloudiness, strands or a gel that will not disperse usually mean the water went in too fast or the vial was shaken; haze that appears later points to warm or bright storage. More on the causes in why peptides gel or go cloudy.
Can I use sterile water instead of bacteriostatic water?
Only for a vial that will be accessed once. Bacteriostatic water is sterile water with 0.9% benzyl alcohol, a preservative that allows a refrigerated vial to be accessed more than once; plain sterile water is intended for single access. Details in bacteriostatic water explained.
How should a reconstituted Hexarelin vial be stored?
Refrigerated at 2 to 8 °C, protected from light and labelled with the date and the concentration. Unopened lyophilised vials are kept cold and dark until they are needed. The full storage guide is how to store research peptides.
Work it out for a different vial or concentration
Our peptide calculator opens pre-set for a 2 mg vial with 2 mL of water and marks the 100 mcg draw of 10 units on a syringe diagram. Change the vial size, water volume, amount or syringe and it recalculates.
For any vial: bacteriostatic water.
Sources: Ghigo E et al. Growth hormone-releasing activity of hexarelin, a new synthetic hexapeptide, after intravenous, subcutaneous, intranasal, and oral administration in man. J Clin Endocrinol Metab. 1994. PMID 8126144. Bisi G et al. Cardiac effects of hexarelin in hypopituitary adults. Eur J Pharmacol. 1999. PMID 10528131. Broglio F et al. Effects of acute hexarelin administration on cardiac performance in patients with coronary artery disease during by-pass surgery. Eur J Pharmacol. 2002. PMID 12144941.
All products supplied by Vistara Labs are intended for laboratory research use only. They are not drugs, are not approved for human or veterinary use, and are not intended to diagnose, treat, cure or prevent any condition. Nothing on this page constitutes medical advice or guidance for use in humans.
