How many units of Ghrelin should I draw?

It depends on your vial size, BAC water, and dose. For a 5mg vial with 2mL BAC water, a beginner dose of 50mcg is typically 2 units on a U-100 syringe. Use the calculator above for your exact numbers.

How much BAC water should I add to Ghrelin?

The standard amount is 2mL of bacteriostatic water for a 5mg vial. More water gives a more dilute solution — easier to measure small doses. Less water means fewer injections per vial. Adjust the BAC water slider in the calculator to see how it changes your syringe units.

How long does a Ghrelin vial last?

At a beginner dose of 50mcg daily, a 5mg vial lasts about 100 doses. The calculator shows exact doses per vial for your selected tier.

What syringe should I use for Ghrelin?

Most people use a U-100 insulin syringe (1mL / 100 units). For very small doses, a U-50 or U-30 syringe gives better precision. The calculator adjusts units automatically for whichever syringe you pick.

Ghrelin Dosage Calculator

MetabolicInjectionResearch~30 minutes half-life

Ghrelin is a 28-amino-acid peptide hormone discovered in 1999 as the endogenous ligand of the growth hormone secretagogue receptor (GHS-R1a).

Potent stimulation of growth hormone release via the GHS-R1a receptorAppetite stimulation — useful in cachexia, anorexia, and wasting conditionsEnhanced gastric motility and gastroprokinetic effectsNeuroprotective properties observed in preclinical models8 weeks on / 4 weeks off

Vial Size

BAC Water (mL)

Dosing Level

50mcg · Daily

Custom Dose (mcg) — optional

Syringe Type

2.0 units

100 units (1mL)

Concentration

2,500

mcg/mL

Draw Volume

0.020

Syringe Units

2.0

units

Doses / Vial

100

doses

Very small draw (2.0 units) — difficult to measure accurately. Consider using less BAC water for a more concentrated solution.

Try 1mL BAC water for an easier-to-measure draw.

Summary: Add 2mL BAC water to your 5mg vial. Draw to 2.0 units on a U-100 syringe for a 50mcg dose. This vial will last 100 doses.

Cycle Planner

Cycle Length (weeks)

Price Per Vial ($) — optional

Subcutaneous / Intravenous. Typical beginner frequency: daily.

Ghrelin Pharmacokinetics

Pharmacokinetics — Active Dose Over Time

t½ = ~30 minutes (IV), ~60-90 minutes (SC)

After 1 half-life (1h): 50% remainsAfter 2 half-lives (3h): 25% remainsAfter 3 half-lives (4h): 12.5% remains

At a 100mcg dose: 50% = 50mcg remaining after 1h. Recommended frequency: 2x Daily.

Disclaimer: This curve is a simplified first-order exponential decay model. Actual pharmacokinetics vary based on injection site, individual metabolism, body composition, and other factors. Half-life values are approximate and based on available preclinical and clinical literature. Many research peptides lack formal human pharmacokinetic studies. This is for educational purposes only — not medical advice.

Ghrelin Dosing Protocol

Level	Dose / Injection	Frequency
Beginner	50mcg	Daily
Moderate	100mcg	2x Daily
Aggressive	200mcg	2x Daily

Note: Endogenous 28-amino-acid orexigenic hormone with octanoyl modification at Ser3. Natural ligand of GHS-R1a. Primarily secreted by gastric oxyntic cells. Rapid degradation by esterases — acylated form is the bioactive species. Not widely available as a research peptide; MK-677, GHRP-2, and GHRP-6 are more commonly used synthetic GHS-R agonists.

About Ghrelin

Ghrelin is a 28-amino-acid peptide hormone discovered in 1999 as the endogenous ligand of the growth hormone secretagogue receptor (GHS-R1a). Uniquely among mammalian peptides, it carries an octanoyl (C8 fatty acid) modification on its third serine residue, which is essential for receptor binding and biological activity. Produced primarily by enteroendocrine cells in the stomach fundus, ghrelin is the only known circulating orexigenic (appetite-stimulating) hormone. It plays a central role in energy homeostasis by stimulating appetite, promoting growth hormone release from the anterior pituitary, regulating gastric motility, and modulating glucose metabolism. Ghrelin levels rise before meals and fall after eating, earning it the designation as the "hunger hormone."

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