GHRP-6 Dosage Calculator: How to Calculate mcg Doses for Reconstituted Peptides
By Dr. Igor I. Bussel, MD · Board-Certified Physician · Updated January 2026
Medical Review
Dr. Igor I. Bussel, MD
Board-Certified Physician
Dr. Igor I. Bussel is a board-certified physician affiliated with the University of California, Irvine, the Gavin Herbert Eye Institute, and the UCI School of Medicine. All content on DosageCalculator.com is medically reviewed for accuracy.
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GHRP-6 is a growth hormone–releasing peptide commonly discussed in research and hormone-optimization contexts. What creates the most confusion is not the peptide itself, but the dosage math after reconstitution — specifically converting milligrams (mg) into micrograms (mcg) and then mapping those values to insulin syringe units.
This article explains that math step-by-step using the same logic applied across the educational calculators on DosageCalculator.co, where unit conversion, concentration math, and syringe mapping are used to reduce calculation errors.
Short Answer
Why GHRP-6 Is Dosed in Micrograms (mcg)
Unlike many injectable medications measured in milligrams, GHRP-6 is active at much smaller amounts. Typical single doses discussed in educational contexts often fall in the 100–300 mcg range. Because these are small quantities, precise reconstitution and measurement are essential.
Reconstitution: The Foundation of All GHRP-6 Calculations
GHRP-6 is typically supplied as a lyophilized powder (for example, 5 mg or 10 mg per vial). Reconstitution means adding bacteriostatic water to dissolve that powder. Once dissolved, every calculation becomes a concentration problem.
1 mg = 1,000 mcg
Step 1: Convert mg to mcg
If a vial contains 5 mg of GHRP-6:
5 mg × 1,000 = 5,000 mcg total
Step 2: Divide by reconstitution volume
If 2 mL of bacteriostatic water is added:
5,000 mcg ÷ 2 mL = 2,500 mcg per mL
Mapping mcg Doses to U-100 Insulin Syringes
Most peptide users measure doses with U-100 insulin syringes, where:
- 1 mL = 100 units
- 0.1 mL = 10 units
Using the example above (2,500 mcg/mL):
- 10 units (0.1 mL) = 250 mcg
- 4 units (0.04 mL) = 100 mcg
A GHRP-6 dosage calculator simply automates this division so users don’t have to do it manually.
Why Reconstitution Volume Changes Measurement Precision
| Reconstitution Choice | Effect on Concentration | Practical Result |
|---|---|---|
| More water added | Lower mcg/mL | Larger syringe draw, easier to measure accurately |
| Less water added | Higher mcg/mL | Very small draw volumes, higher risk of error |
Common Calculation Mistakes
- Confusing mg with mcg
- Forgetting to divide by reconstitution volume
- Reading syringe units as mL
- Changing water volume without recalculating
How GHRP-6 Dosage Calculators Fit Into the Bigger Picture
The same calculation principles used here apply to many other dosing tools, including peptide reconstitution calculators, mg-to-mL converters, and syringe mapping guides. That shared logic is why educational platforms like DosageCalculator.co focus on unit consistency, transparent formulas, and step-by-step outputs rather than dose recommendations.