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How to Microdose Semaglutide: Measuring & Injecting from a Compounded Vial
Semaglutide microdosing requires compounded injectable semaglutide in a multi-dose vial — not the branded auto-injector pens (Ozempic, Wegovy). This guide covers everything you need to know about the equipment, dose math, injection technique, and tracking your results.
Before you start
- You must have a valid prescription from a licensed prescriber.
- Compounded semaglutide must come from a licensed pharmacy — not from an unverified online source.
- Your provider should have reviewed your target dose and injection schedule with you before your first injection.
- If this is your first injection ever, ask your provider or a nurse to walk you through the technique once in person or via video.
What You Need
Insulin syringe — 1mL, 28–31 gauge
The 1mL barrel provides 0.01mL gradations essential for small volumes. 28–31g needle minimizes injection pain. 5/16" (8mm) or 1/2" (12.7mm) needle length for subcutaneous.
Compounded semaglutide vial
From your licensed pharmacy. Confirm the concentration (mg/mL) on the vial label before calculating dose volumes.
Alcohol swabs
For cleaning the vial septum and injection site before each use. Let air-dry before injecting.
Sharps container
FDA-cleared sharps disposal container. Needles and syringes must never go in household trash or recycling. Most pharmacies provide free containers.
Gauze pads or cotton balls(optional)
Apply light pressure after withdrawal. Do not rub the injection site.
Tracking log (paper or app)(optional)
Record injection date, dose, site, and any side effects. Essential for identifying patterns and discussing with your provider.
Dose Measurement Reference Table
Formula: Volume (mL) = Dose (mg) ÷ Concentration (mg/mL). Always verify the concentration on your specific vial label.
| Target dose | 2.5 mg/mL vial | 5 mg/mL vial |
|---|---|---|
| 0.1 mg | 0.04 mL | 0.02 mL |
| 0.125 mg | 0.05 mL | 0.025 mL |
| 0.25 mg | 0.10 mL | 0.05 mL |
| 0.5 mg | 0.20 mL | 0.10 mL |
| 1.0 mg | 0.40 mL | 0.20 mL |
Note: Volumes below 0.05 mL are very small and require careful measurement on a 1mL syringe. Confirm with your prescriber before using doses at or below 0.1mg.
6-Step Injection Technique
Wash your hands thoroughly with soap and water before beginning.
Prep the vial
Wipe the rubber septum of the vial with a fresh alcohol swab. Let it air-dry for 10–15 seconds — do not blow on it or fan it.
Draw air into the syringe
Pull the plunger back to draw air equal to your target dose volume (e.g., 0.10mL for a 0.25mg dose from a 2.5mg/mL vial).
Inject air into the vial
Insert the needle through the rubber septum and push the air in. This creates positive pressure in the vial, making it easier to draw the medication out.
Draw the medication
Invert the vial. Pull the plunger back slowly to draw out your calculated dose volume. Keep the needle tip below the surface of the liquid.
Remove air bubbles
With the needle pointing up, gently tap the syringe barrel to float any bubbles to the top. Press the plunger lightly to expel air — not medication. Confirm your volume marking is still correct.
Inject subcutaneously
Pinch a fold of skin at your chosen injection site (abdomen, thigh, or upper arm). Insert the needle at a 45–90° angle. Push the plunger fully and hold for 10 seconds before withdrawing. Release the skin fold. Apply light pressure with a gauze pad — do not rub.
After each injection: Place the used needle and syringe immediately in your sharps container. Never recap needles. Sharps containers can be dropped off at most pharmacies, hospitals, and many fire stations for free.
Injection Site Rotation
Rotating injection sites prevents lipodystrophy — fatty tissue changes that develop from repeated injections at the same spot. Lipodystrophy can alter semaglutide absorption and produce visible lumps or dimpling. Rotate within and between sites.
Abdomen
— At least 2 inches from navel; any quadrantMost commonly used; easiest self-injection. Avoid waistband or belt line area.
Front of thigh
— Middle third of outer thigh surfaceGood for self-injection when seated. Avoid inner thigh.
Upper arm
— Outer/back surface of upper armEasier with caregiver assistance. Using a mirror or wall technique for self-injection.
Suggested rotation example: Week 1 — right abdomen. Week 2 — left abdomen. Week 3 — right thigh. Week 4 — left thigh. Continue cycling.
Storing Your Compounded Semaglutide Vial
Unopened (sealed) vial
- Refrigerate at 2–8°C (36–46°F)
- Keep away from direct light and heat
- Do not freeze
Opened (in-use) vial
- Room temp up to 25°C (77°F) for up to 28 days
- May also be refrigerated
- Discard after 28 days of first use
Storage guidelines can vary by pharmacy formulation. Always confirm with your dispensing pharmacy — instructions on the vial label take precedence over general guidelines.
When to Inject: Day, Time, and Consistency
Semaglutide is a once-weekly injection. The two key rules: same day every week, and consistent timing to help you remember. Day-of-week consistency matters more than time of day.
Morning injection
Some patients prefer morning because nausea may peak 2–4 hours post-injection. If you're active or eating breakfast, the distraction can reduce perceived nausea. Take with food or shortly after if stomach upset is a concern.
Evening injection
Other patients prefer evening so they sleep through peak nausea. If your GI side effects are manageable, timing is personal preference. Experiment during the first few weeks to find what works for you.
You can shift your injection day by 1–2 days if needed — just don't take two injections within 4 days of each other. Discuss any scheduling changes with your provider.
Tracking: The Simple Weekly Log
A simple log helps you and your provider identify patterns — which doses caused side effects, how weight trends correlate with dose changes, and whether you're on track for your maintenance goal. Keep it brief:
| Date | Dose (mg) | Injection site | Nausea (0–3) | Other SE | Weight |
|---|---|---|---|---|---|
| 5/6/2026 | 0.10 mg | R abdomen | 1 | None | — |
| 5/13/2026 | 0.10 mg | L abdomen | 0 | None | 198.4 lb |
| 5/20/2026 | 0.125 mg | R thigh | 1 | Slight fatigue | 197.1 lb |
Nausea scale: 0 = none, 1 = mild/noticeable, 2 = moderate/affected activity, 3 = severe/vomiting. Track weight weekly, same time of day, same scale.
When to Contact Your Provider
Call immediately:
- Vomiting that persists longer than 24 hours
- Severe or rapidly worsening abdominal pain
- Signs of pancreatitis: severe persistent upper-belly pain radiating to the back
- Signs of allergic reaction: rash, facial/lip/throat swelling, difficulty breathing
- Vision changes or sudden dizziness after injection
Common, expected — no urgent action needed:
- Mild to moderate nausea in the 4–8 hours post-injection (especially early in treatment)
- Temporary reduced appetite
- Minor redness, bruising, or itching at injection site
- Loose stools or constipation in the first few weeks
- Mild headache in the first 24 hours post-injection
Where to Get Compounded Semaglutide for Microdosing
All providers below supply compounded injectable semaglutide in a multi-dose vial with a valid prescription. Pricing verified May 2026.
Strut Health
Verified on brand site Invalid DateLowest-cost option for compounded injectable semaglutide. Vial-based delivery provides full dose flexibility for any custom microdose. Strong choice for patients who already understand the protocol and want the lowest-cost access to compounded vials.
- Injectable compounded semaglutide from $99/mo
- Vial format — custom dose measurement possible
- Physician review and prescription included
Ivim Health
Microdosing specialist — explicitly offers customized semaglutide titration protocols. Best for patients who want provider guidance on a non-standard titration schedule or who are new to microdosing and want a supervised approach.
- Custom microdosing protocols explicitly offered
- Physician-supervised titration adjustments
- Compounded injectable semaglutide
TMates
Verified on brand site Invalid DateEstablished compounded semaglutide provider with monthly physician access. Good option for patients who want ongoing provider support for dose management alongside the compounded vial supply.
- Compounded injectable semaglutide from $158/mo
- Ongoing provider access for adjustments
- Physician-supervised titration
How this page is reviewed
Editorially reviewed by GLP1CompareHub Editorial Team. We are an independent affiliate publisher — we are not licensed medical providers and this site does not deliver medical advice. Every claim on this page is sourced to a verifiable origin (peer-reviewed study, FDA documentation, live brand-site crawl, or our Katalys partner dashboard).
Affiliate disclosure: We earn a commission when you sign up with a provider through our links — at no extra cost to you. We do not rank providers by what they pay us; we rank by patient fit. Full disclosure. Read our methodology · medical disclaimer.
Frequently Asked Questions
What syringe do I need for semaglutide microdosing?
Use a 1mL insulin syringe with a 28–31 gauge, 5/16" (8mm) or 1/2" (12.7mm) needle. The 1mL barrel gives you clear 0.01mL graduations, which is essential for measuring small volumes accurately. For true microdoses below 0.1mg from a 2.5mg/mL vial, you'll be drawing volumes as small as 0.02–0.04mL — legible only on a 1mL syringe, not a larger barrel.
How do I calculate my semaglutide dose volume?
The formula is: Volume (mL) = Dose (mg) ÷ Concentration (mg/mL). For a 2.5mg/mL vial and a 0.25mg target dose: 0.25 ÷ 2.5 = 0.10mL. For a 5mg/mL vial and the same 0.25mg dose: 0.25 ÷ 5 = 0.05mL. Always confirm the concentration printed on your pharmacy vial label before calculating — different compounding pharmacies supply different concentrations.
Where should I inject subcutaneous semaglutide?
The three approved subcutaneous injection sites for semaglutide are: (1) abdomen — anywhere at least 2 inches from the navel; (2) front of thigh — middle third of the outer surface; (3) upper arm — outer back surface (best if someone else administers). Rotate between different sites each week to prevent lipodystrophy (fatty tissue changes that can alter absorption). Do not inject into the same exact spot twice in a row.
How long does an opened semaglutide vial last?
Confirm storage guidelines with your pharmacy, as formulations vary. Generally: sealed (unopened) vials should be refrigerated at 2–8°C (36–46°F) until first use. After the vial is punctured and opened, it can typically be stored at room temperature (up to 25°C / 77°F) for up to 28 days, or refrigerated. Keep away from direct light. Discard after 28 days of first use even if medication remains.
What is the best time of day to inject semaglutide?
Semaglutide is injected once weekly and can be taken at any consistent time of day. Most patients choose a fixed day and time that they can remember week to week. Some evidence and patient experience suggests morning injection may reduce perceived nausea in some individuals (nausea may peak 2–4 hours post-injection, and being asleep may reduce awareness of it). Other patients prefer evening. The most important factor is consistency — same day each week, regardless of time.
When should I call my provider after a semaglutide injection?
Contact your prescribing provider immediately if you experience: vomiting that persists longer than 24 hours; severe or worsening abdominal pain; signs of pancreatitis (severe persistent upper-belly pain radiating to the back, which may worsen when lying down); signs of a severe allergic reaction (rash, swelling of face/lips/throat, difficulty breathing); or any other symptom your provider asked you to watch for. Mild nausea, temporary reduced appetite, and minor injection-site redness are common and expected — they do not require urgent contact.