Hexarelin reconstitution calculator.
A 2 mg vial of Hexarelin dissolved in 2 mL of bacteriostatic water is 1,000 mcg per mL, which is 10 mcg per unit on a U-100 insulin syringe.
Hexarelin tends to aggregate at neutral pH, so the documented method reconstitutes it in two steps: a small volume of dilute acetic acid first, then bacteriostatic water to volume. The concentration comes from the total liquid in the vial, and that is where the arithmetic goes wrong if the acid is left out of the count.
Reference range often cited for Hexarelin: 100–200 mcg, shown for orientation only, not a recommendation. Enter your own target below. Read the evidence →
Each unit on a 100u · 1.0 mL syringe ≈ 10 mcg of this solution.
Show the math
More water → lower concentration → more units for the same amount.
How much bacteriostatic water for a Hexarelin vial?
There is no single correct volume. More water gives a weaker solution, so each unit on the syringe holds less Hexarelin and a given amount takes more units to measure, which is easier to read on the syringe scale. Less water does the opposite. These tables show the concentration for each common vial size across the usual volumes. They are arithmetic, not a recommendation of how much to take.
| BAC water | Concentration | Per 1 unit | Per 10 units |
|---|---|---|---|
| 1 mL | 2,000 mcg/mL | 20 mcg | 200 mcg |
| 1.5 mL | 1,333 mcg/mL | 13.3 mcg | 133 mcg |
| 2 mL | 1,000 mcg/mL | 10 mcg | 100 mcg |
| 2.5 mL | 800 mcg/mL | 8 mcg | 80 mcg |
| 3 mL | 667 mcg/mL | 6.7 mcg | 67 mcg |
| BAC water | Concentration | Per 1 unit | Per 10 units |
|---|---|---|---|
| 1 mL | 5,000 mcg/mL | 50 mcg | 500 mcg |
| 1.5 mL | 3,333 mcg/mL | 33.3 mcg | 333 mcg |
| 2 mL | 2,500 mcg/mL | 25 mcg | 250 mcg |
| 2.5 mL | 2,000 mcg/mL | 20 mcg | 200 mcg |
| 3 mL | 1,667 mcg/mL | 16.7 mcg | 167 mcg |
How many units of Hexarelin is a given amount?
Divide the amount in micrograms by the micrograms per unit for your mix. With a solution of 2,500 mcg per mL, one unit on a U-100 syringe holds 25 mcg, so any amount in mcg divided by 25 gives the units. The calculator above does this for you from your own vial and water, and the tables give the per-unit figure for each common mix.
Why does Hexarelin need its own calculation?
- 0.2 mL of acid followed by 2 mL of bacteriostatic water is 2.2 mL, not 2. On a 2 mg vial that is about 909 mcg/mL instead of 1,000, so 100 mcg reads as 11 units rather than 10. Making the total up to 2 mL, as the example on this page does, keeps the round figure.
- Vials are 2 mg and 5 mg, smaller than the 5 mg and 10 mg vials of GHRP-2 and GHRP-6. A GHRP chart built on a 5 mg vial reads 2.5 times too few units against a 2 mg hexarelin vial at the same volume. 5 mg made up to 2 mL is 2,500 mcg/mL, where 100 mcg is 4 units.
- If the solution turns cloudy when the bacteriostatic water goes in, peptide has come out of solution, and the calculated concentration no longer describes the liquid.
How is Hexarelin administered, and what does the math look like?
How Hexarelin is actually administered, with the concentration arithmetic written out. Amounts in these tables are illustrative examples of the math, never a recommendation.
Hexarelin: research formats
Choose the format you are researching to see route-specific notes.
Potent GHRP; requires acetic acid for reconstitution due to its aggregation at neutral pH.
Hexarelin is a potent ghrelin-receptor agonist sold as a 2 mg vial. It belongs to the GHRP class and aggregates at neutral pH, so it requires initial reconstitution in 0.6% acetic acid, then dilution with BAC water. Reconstituting 2 mg in 2.0 mL (acetic acid first, then BAC water to volume) gives 1,000 mcg/mL.
Reconstitution: add 0.2–0.3 mL of 0.6% acetic acid first and swirl gently until dissolved, then add BAC water to total 2.0 mL. Adding BAC water directly causes precipitation.
Hexarelin reconstitution: common questions
Why won't hexarelin dissolve in bacteriostatic water?
It aggregates at neutral pH. The documented approach is to dissolve it in a small volume of dilute acetic acid first, swirl until clear, then add bacteriostatic water to the final volume. Adding the water first can make it precipitate.
Does the acetic acid change the concentration?
Yes, if you count only the bacteriostatic water. Concentration is total mass divided by total liquid, so enter the combined volume of acid and water above, not just the water.
How many units is 100 mcg of hexarelin?
On a 2 mg vial made up to 2 mL in total (1,000 mcg/mL) it is 10 units. On a 5 mg vial made up to 2 mL (2,500 mcg/mL) it is 4 units.
What the evidence on Hexarelin actually shows
Knowing the concentration is not the same as knowing whether to use it. These are the strongest studies behind the Hexarelin profile, labelled with the study type PubMed itself assigns.
- Randomized controlled trial · 1999Acute cardiovascular and hormonal effects of GH and hexarelin, a synthetic GH-releasing peptide, in humansJournal of endocrinological investigation · PMID 10342360
- Clinical trial · 2001Growth hormone-independent cardiotropic activities of growth hormone-releasing peptides in normal subjects, in patients with growth hormone deficiency, and in patients with idiopathic or ischemic dilated cardiomyopathyEndocrine · PMID 11322491
- Clinical trial · 1999The effect of chronic hexarelin administration on the pituitary-adrenal axis and prolactinClinical endocrinology · PMID 10341859
This page is arithmetic on numbers you enter. It does not recommend an amount of Hexarelin, and nothing here is medical advice. For what the published evidence actually supports, read the Hexarelin profile, and for regulatory status see is Hexarelin legal. Reviewed June 1, 2026.
Different question? The general reconstitution calculator covers every compound on the site, the blend calculator handles multi-peptide stacks, and vial longevity turns a vial into weeks of supply.
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