Semaglutide (10 mg vial)
Once weekly subcutaneous protocol for metabolic and weight-management research.
Semaglutide is a GLP-1 receptor agonist whose fatty-acid chain binds albumin and stretches its half-life to roughly a week, enabling once-weekly dosing. It is approved for chronic weight management and type 2 diabetes, with cardiovascular outcome data behind it. The protocol below follows the standard weekly subcutaneous titration from 0.25 mg up to a 2.4 mg maintenance dose.
Quick answer: at the standard 10 mg + 1 mL reconstitution, a 2.4 mg dose of Semaglutide draws 24 units (0.24 mL) on a U-100 insulin syringe, once weekly subcutaneous.
Get Semaglutide → code PEPDOSE
Protocol overview
Dosing & reconstitution
Frequency: Once weekly subcutaneous
Typical duration: 16-20+ weeks
Reconstitution: 10 mg vial + 1 mL bacteriostatic water = 10 mg/mL. Units below are for a U-100 insulin syringe at this concentration.
| Phase | Dose | Units per injection |
|---|---|---|
| Weeks 1-4 | 0.25 mg | 2.5 units (0.025 mL) |
| Weeks 5-8 | 0.5 mg | 5 units (0.05 mL) |
| Weeks 9-12 | 1.0 mg | 10 units (0.1 mL) |
| Weeks 13-16 | 1.7 mg | 17 units (0.17 mL) |
| Week 17+ | 2.4 mg | 24 units (0.24 mL) |
Units = (dose ÷ concentration) × 100 on a U-100 syringe. Change the vial size or water volume and the calculator redoes all of this for you.
Track this protocol → Free account · log doses, rotate sites, never lose your history
Semaglutide dosing schedule
The escalation below is the one used in the STEP phase 3 obesity programme and carried onto the approved weight-management label. It exists to limit gastrointestinal effects — the trials escalated slowly for tolerability, not because the lower steps do more.
| Phase | Amount | Frequency | Notes |
|---|---|---|---|
| Weeks 1–4 | 0.25 mg | Once weekly | Tolerability lead-in, not an intended effective amount. |
| Weeks 5–8 | 0.5 mg | Once weekly | First escalation. |
| Weeks 9–12 | 1.0 mg | Once weekly | |
| Weeks 13–16 | 1.7 mg | Once weekly | |
| Week 17 onward | 2.4 mg | Once weekly | Maintenance amount for the remainder of the trial. |
Study length: 68 weeks in STEP 1, with the maintenance amount reached at week 17.
Reconstitution and measurement
This part is arithmetic and does not depend on the evidence level. Concentration is vial size divided by the bacteriostatic water you add. Draw volume is your target amount divided by that concentration. Units are draw volume times 100, because a U-100 syringe reads 100 units per millilitre. Common vials for Semaglutide: 10, 15, 20, 30, 50 mg.
- Wipe the stoppers of both vials with an alcohol swab and let them dry.
- Draw the bacteriostatic water with a sterile syringe and inject it slowly down the inside wall of the peptide vial — never straight onto the powder.
- Swirl gently until the solution is clear. Do not shake; foaming and agitation damage peptides.
- Label the vial with the date and concentration, and refrigerate at 2–8 °C protected from light.
Worked example at the calculator defaults: 5 mg + 2 mL of bacteriostatic water = 2.5 mg/mL, so on a U-100 insulin syringe 1 unit = 25 mcg of Semaglutide. Change either input and the calculator redoes this for you.
Storage and stability
Supplies math
Whatever amounts your research uses, the planning arithmetic is the same. The calculator runs all of this per compound.
Supplies by protocol length
Based on the maintenance dose above (2.4 mg, once weekly subcutaneous) and a 10 mg vial reconstituted with 1 mL.
| Duration | Injections | Vials | Syringes | Bac water | Swabs |
|---|---|---|---|---|---|
| 8 weeks | 8 | 2 x 10 mg | 9 | 1 x 10 mL | 16 |
| 12 weeks | 12 | 3 x 10 mg | 14 | 1 x 10 mL | 24 |
| 16 weeks | 16 | 4 x 10 mg | 18 | 1 x 10 mL | 32 |
Syringe count includes ~10% spares. Swabs = 2 per injection (stopper + site). Vial count assumes the full maintenance dose for the entire duration.
Important notes
Practical considerations for consistency and safety.
- Use a new sterile insulin syringe for each injection and dispose in a proper sharps container.
- Rotate injection sites (abdomen, thighs, upper arms) systematically to reduce local irritation and avoid lipohypertrophy.
- Inject slowly and steadily; wait a few seconds before withdrawing the needle to ensure complete delivery.
- Administer on the same day each week for consistency. If a dose is missed, administer as soon as possible within a few days.
- The 10 mg vial size is standard for this compound. Reconstitute with 1 mL bacteriostatic water for a convenient concentration.
How Semaglutide works
A GLP-1 receptor agonist carrying a fatty-acid chain that binds albumin and stretches its half-life to about a week. It slows gastric emptying, increases glucose-dependent insulin secretion, and acts on hypothalamic appetite centres.
Benefits & side effects
Potential benefits
- Significant weight loss in clinical trials
- Improved glycaemic control and HbA1c
- Cardiovascular risk reduction shown in SELECT trial
- Reduced appetite and food cravings
Possible side effects
- Nausea, vomiting and diarrhoea (common on escalation)
- Reduced appetite (intended effect)
- Injection site reactions
- Potential for gallbladder events at higher doses
This list reflects published literature and community reports. Individual responses vary. Not medical advice.
Bloodwork worth tracking
The community-standard practice is a baseline panel before starting, a recheck 8 to 12 weeks in, and another after time off. For Semaglutide, the markers most worth watching:
HbA1clipid panelCMPamylase/lipase
Typical time off: Taper off over 4-8 wks
Lab panels are how a research protocol stays honest: numbers move before symptoms do. Interpretation belongs with a clinician. Not medical advice.
Lifestyle factors
None of the literature above was run on a background of poor sleep and no protein. These variables move outcomes more reliably than any compound on this site.
- Protein in the 1.6 to 2.2 g/kg range preserves lean mass through any body-composition phase.
- Resistance training 2 to 4 days per week plus 150+ minutes of weekly aerobic work reinforces whatever the protocol is doing.
- Sleep is the recovery window: 7 to 9 hours at consistent times.
- Hydration matters more than usual on compounds with GI or flushing effects: 2 to 3 liters daily.
- Track the variables that matter: weigh-ins, measurements, photos, and labs at sensible intervals.
Subcutaneous technique and practical notes
General best practice from clinical injection guidance — the same fundamentals nurses are taught, none of it specific to any compound.
Quick answers
How many syringe units is a 2.4 mg dose of Semaglutide?
At the standard reconstitution of 10 mg with 1 mL bacteriostatic water (10 mg/mL), a 2.4 mg dose draws 24 units (0.24 mL) on a U-100 insulin syringe.
How do you reconstitute Semaglutide?
Add 1 mL of bacteriostatic water to the 10 mg vial for 10 mg/mL. Inject the water slowly down the inside wall of the vial, swirl gently without shaking, and refrigerate at 2 to 8 °C after mixing.
How long does a 10 mg vial of Semaglutide last?
About 4 maintenance doses of 2.4 mg, roughly 4 weeks at once weekly subcutaneous.
Does Semaglutide have human trial data?
Yes. The dosing on this page is anchored to published human research (Wilding JPH et al., "Once-Weekly Semaglutide in Adults with Overweight or Obesity", NEJM 2021 (STEP 1)).
How does Semaglutide work?
A GLP-1 receptor agonist carrying a fatty-acid chain that binds albumin and stretches its half-life to about a week. It slows gastric emptying, increases glucose-dependent insulin secretion, and acts on hypothalamic appetite centres.
Sourcing Semaglutide
Whatever you are working with, the documentation matters more than the price. Ask for a batch certificate of analysis whose lot number matches the vial you actually receive — a COA for a different batch tells you nothing about yours.
Semaglutide at Summit Research Supply → Grade a COA first
Summit is the supplier we feature and an affiliate link. Our COA checklist applies the same way to any vendor.
