Semaglutide Microdosing: Dose Chart, Units, and Protocol

Microdosing semaglutide means working in steps below the usual 0.25 mg starting dose, often in the 0.05 mg to 0.25 mg range, raised slowly over many weeks. The appeal is simple: smaller increments mean smaller jumps. The hard part is the math, because a tiny milligram dose at a concentrated vial can land on a fraction of a unit that no syringe line can show.

This page is a neutral reference. It lays out a common microdose ladder and maps each fractional milligram to the units you would draw on a U-100 syringe, picking concentrations that keep every step on a clean line. It is educational only and is not dosing advice. Any actual schedule belongs to a licensed clinician. Run your own vial through the semaglutide calculator before you draw anything.

What microdosing actually changes

A standard titration ladder steps 0.25, 0.5, 1.0, 1.7, then 2.4 mg, holding each for about four weeks. A microdose approach fills in the space below and between those rungs with smaller moves, for example 0.05 mg, then 0.1 mg, then 0.15 mg. The total drug per week is lower and the gaps between steps are narrower. Whether that is appropriate is a clinical question, not a math one.

The one formula behind every number

On a U-100 insulin syringe, 100 units equals 1 mL. Units depend on concentration, which is total peptide divided by the bacteriostatic water you add:

• Concentration (mg/mL) = peptide mg / water mL
• Units = (dose mg / concentration mg/mL) x 100

Worked example: a 5 mg vial mixed with 2 mL of water is 2.5 mg/mL. A 0.1 mg microdose is (0.1 / 2.5) x 100 = 4 units. The same 0.1 mg from a 5 mg vial mixed in just 1 mL is 5 mg/mL, which gives only 2 units, a harder draw with less margin for error.

Why concentration is everything at low doses

At microdose levels the wrong concentration makes the dose unreadable. A 0.05 mg dose at 5 mg/mL is just 1 unit. At 10 mg/mL it is half a unit, which sits between marks on a standard syringe. The fix is to mix on the dilute side so small milligrams spread across more units.

• Less water, stronger mix, fewer units per dose, harder to read at low doses.
• More water, weaker mix, more units per dose, cleaner draws for microdosing.

For a low-dose ladder, a 5 mg vial in 2 mL (2.5 mg/mL) is a practical choice because the common microdose steps all fall on whole units. To pick a fill volume on purpose, the reconstitution calculator shows the units at any water amount before you mix.

Microdose chart at 2.5 mg/mL

Using a 5 mg vial reconstituted with 2 mL of water (2.5 mg/mL), a common low-dose ladder maps to clean units like this:

1. 0.05 mg = 0.02 mL = 2 units
2. 0.10 mg = 0.04 mL = 4 units
3. 0.15 mg = 0.06 mL = 6 units
4. 0.20 mg = 0.08 mL = 8 units
5. 0.25 mg = 0.10 mL = 10 units

Every step lands on an even unit, which is the whole point of choosing this concentration. From here a schedule might continue onto the standard ladder, where 0.5 mg is 20 units and 1.0 mg is 40 units at the same mix.

Microdose chart at 5 mg/mL

Mix the same 5 mg vial with only 1 mL of water and you get 5 mg/mL, which halves every unit count. This is a more concentrated, harder-to-read option at microdose levels:

1. 0.05 mg = 0.01 mL = 1 unit
2. 0.10 mg = 0.02 mL = 2 units
3. 0.15 mg = 0.03 mL = 3 units
4. 0.20 mg = 0.04 mL = 4 units
5. 0.25 mg = 0.05 mL = 5 units

The milligrams are identical to the chart above. Only the volume you pull changed. Notice that 0.05 mg is now a single unit, leaving almost no room to misread the line. That is why a more dilute mix is generally easier for microdosing. If unit markings are unfamiliar, see how to read an insulin syringe for peptides.

How to use these charts safely

1. Confirm vial strength. Read the actual mg printed on your vial, not an assumed label.
2. Pick your water volume. This sets concentration and locks in units per step. A more dilute mix reads cleaner at microdose levels.
3. Match the right chart. Use the section for your exact mg and mL, never someone else's vial.
4. Verify with the tool. Enter your numbers in the semaglutide calculator and confirm the units by hand.
5. Recheck after any change. A new vial size or new water volume means a brand-new chart.

Log what you actually draw so the unit count is never a guess from week to week. For the standard schedule above the microdose range, see the semaglutide dosage chart, and for broader background read peptide dosage explained. You can browse other compounds on the peptides reference page.

A note on scope

Semaglutide is a research compound that is not approved for general human consumption outside an approved product and a prescriber's direction. The microdose ladder above is a reference pattern for the math, not a recommendation to follow any particular schedule. Decisions about whether, when, and how much belong to a licensed clinician. See the full disclaimer for details.