Semaglutide Reconstitution Calculator

What Is Semaglutide?

Semaglutide is a long-acting synthetic glucagon-like peptide-1 (GLP-1) receptor agonist sharing 94% structural homology with human endogenous GLP-1. Engineered with an Aib (alpha-aminoisobutyric acid) substitution at position 8 to resist DPP-4 enzymatic degradation and a C18 fatty acid chain attached at lysine 26, Semaglutide binds reversibly to plasma albumin. This structural modification extends its biological half-life to approximately 7 days (165 hours).

Semaglutide is widely researched for glycemic control, energy homeostasis, and central nervous system satiety induction. Compared to dual agonists like Tirzepatide or complementary amylin analogues like Cagrilintide, Semaglutide remains the benchmark mono-GLP-1 agonist. Reconstituting lyophilized Semaglutide with our peptide calculator ensures exact microgram to milligram conversions using bacteriostatic water.

Semaglutide Dosage Chart

Because starting research doses for Semaglutide are low (0.25 mg or 250 mcg), adding 2.0 mL or 3.0 mL of bacteriostatic water is recommended. Higher diluent volumes expand the measurement margin on U-100 syringes, making low-dose draws accurate and repeatable.

Vial: 2 mgWater: 2.0 mL

Concentration1.0 mg/mL

Target Dose0.25 mg (250 mcg)

Draw to Mark:25.0 Units

Vial: 3 mgWater: 2.0 mL

Concentration1.5 mg/mL

Target Dose0.25 mg (250 mcg)

Draw to Mark:16.7 Units

Vial: 5 mgWater: 2.0 mL

Concentration2.5 mg/mL

Target Dose0.5 mg (500 mcg)

Draw to Mark:20.0 Units

Vial: 10 mgWater: 2.0 mL

Concentration5.0 mg/mL

Target Dose1.0 mg (1,000 mcg)

Draw to Mark:20.0 Units

Vial Size	Bac Water Added	Concentration	Target Research Dose	Draw Units (U-100)
2 mg	2.0 mL	1.0 mg/mL	0.25 mg (250 mcg)	25.0 Units
3 mg	2.0 mL	1.5 mg/mL	0.25 mg (250 mcg)	16.7 Units
5 mg	2.0 mL	2.5 mg/mL	0.5 mg (500 mcg)	20.0 Units
10 mg	2.0 mL	5.0 mg/mL	1.0 mg (1,000 mcg)	20.0 Units

How to Reconstitute Semaglutide

Reconstituting Semaglutide requires careful fluid handling to avoid protein denaturation and maintain sterile integrity across multi-dose research protocols.

Visual Standard Operating Procedure

Semaglutide Step-by-Step SOP

5 Standard Reconstitution Steps for Semaglutide

Swab the rubber stoppers of both vials with 70% isopropyl alcohol and let dry completely.
Draw the required volume of bacteriostatic water (e.g. 2.0 mL) into a sterile syringe.
Depress the needle through the stopper of the Semaglutide vial, aiming liquid against the glass wall.
Swirl the vial gently until the white lyophilized cake is fully dissolved into a clear solution.
Store reconstituted Semaglutide upright in a dark refrigerator at 2°C–8°C.

❄️ Storage & Shelf-Life Notice (Semaglutide)

Reconstituted Semaglutide prepared with Bacteriostatic Water is stable for 30 days under refrigeration (2°C–8°C). Protect from heat and direct sunlight.

⚠️ Common Preparation Mistakes to Avoid

Mistakes include rapidly agitating the vial causing cloudiness or foaming, drawing liquid with coarse large-bore syringes that obscure micro-unit markings, and leaving reconstituted vials at room temperature.

Semaglutide Dosing FAQ

How much bac water do I add to a 3mg Semaglutide vial?↓

Adding 2.0 mL of bac water to 3 mg Semaglutide gives a concentration of 1.5 mg/mL (150 mcg per 10 units). A 0.25 mg dose equals 16.7 units on a U-100 syringe.

How many units is 0.25 mg Semaglutide on a 2mg vial?↓

With 2.0 mL of water added to a 2 mg vial (1 mg/mL concentration), a 0.25 mg dose is exactly 25 units (0.25 mL).

What is the half-life of Semaglutide?↓

Semaglutide has an extended half-life of approximately 7 days (165 hours), supporting weekly dosing in clinical research.

How do I convert 250 mcg to mg for Semaglutide?↓

Divide micrograms by 1,000: 250 mcg ÷ 1,000 = 0.25 mg.

Can Semaglutide be frozen after mixing?↓

No. Reconstituted liquid peptide solutions must never be frozen as freeze-thaw cycles break down peptide chains.