Injection 101
If you have never used a needle before, this is for you. Take it one step at a time. The first injection feels like a big deal; by the third, it is routine.
Start small
If you are new to peptides, begin with the lowest effective dose — often called a micro dose or intro dose. This is not about being cautious for caution's sake; it is the smartest way to learn how your body responds before committing to a full protocol.
One at a time
The safest way to begin is with one new peptide at a time. Adding a single compound lets you observe how you respond, spot side effects, and know exactly what is doing what. Once you understand your baseline and tolerance, combining compounds becomes a much clearer decision.
If you are already comfortable and looking for popular research combinations, the Protocol Stack Builder lays out goal-based stacks — fat loss, healing, longevity, cognition, and more — with combined vial pricing.
Browse Protocol Stack BuilderDosage calculator
Pick a peptide, choose how much BAC water you plan to mix it with, and set your starting dose as a percentage of the typical research dose. The calculator returns your syringe units and how many doses one vial provides.
Mix
30mg + 2mL BAC water
= 15.00 mg/mL concentration
Typical research dose
2mg
per administration
Your starting dose
500mcg
25% of typical
Draw to
3.3 units
on a U-100 insulin syringe (0.033 mL)
Doses per vial
~60 doses at this level
Round syringe units to the nearest tick mark you can actually see. When in doubt, round down — it is safer to under-dose than over-dose while you learn how your body responds.
For research reference only. Not medical advice.
Peptide vial
lyophilized powder before mixing
Bacteriostatic water (BAC water)
the sterile liquid used to reconstitute the powder
Insulin syringe
29–31G, 1cc / 100-unit is standard
Alcohol prep pads
to clean the vial top and your skin
Sharps container
an old laundry detergent bottle works in a pinch
A clean, well-lit surface
bathroom counter or desk
Peptides usually arrive as a freeze-dried powder. Before you can inject, you reconstitute them with bacteriostatic water. The goal is simple: add the right amount of water, dissolve gently, and keep everything clean.
Clean the peptide vial stopper and the BAC water vial stopper with separate alcohol pads. Let them air-dry for a few seconds.
Pull back the plunger to the amount your protocol calls for — commonly 1–3 mL. Insert the needle into the BAC water vial, push air in, then draw the liquid out.
Insert the needle through the peptide vial stopper at an angle so the water runs slowly down the inside of the glass. Do not shoot it directly onto the powder — a gentle stream preserves the peptide.
Do not shake. Gently swirl the vial or roll it between your palms until the powder is fully dissolved. Foamy or aggressive mixing can damage the peptide chain.
Write the peptide name, concentration, and reconstitution date on the vial. Most reconstituted peptides stay stable in the refrigerator for several weeks.
Scrub with soap and warm water for 20 seconds. Clean hands are the easiest way to prevent infection.
Use an alcohol pad on the rubber stopper and let it air-dry for a few seconds. This keeps the inside of the vial sterile.
Pull back the plunger to the exact unit your protocol calls for. Insert the needle into the vial, push air in, then turn the vial upside down and slowly pull the plunger back past your dose. Tap out any bubbles and push the excess back until the plunger lines up with your dose.
Subcutaneous injections go into the fatty layer just under the skin. The belly, love handles, or front of the thigh are the easiest spots. Wipe the skin with an alcohol pad and let it dry.
Gently pinch a fold of skin and fat between your thumb and fingers. This lifts the tissue away from muscle and makes the injection nearly painless.
Hold the syringe like a dart at about a 45-degree angle. Slide it smoothly into the pinched fold. You barely need to push — these needles are tiny.
Press the plunger down slowly and steadily. Fast injections sting more and can cause bruising or leaking.
Let go of the skin, pull the needle straight out, and immediately drop the syringe into a sharps container. Do not recap it.
Best practices
Sometimes seeing it done is the missing piece. These beginner-friendly videos walk through reconstitution and injection technique better than text alone.
Doctor Explains How To CORRECTLY Prepare And Inject Your Peptides
Dr. Jones, DC
How to reconstitute your peptides at home
LaSara Medical Group
Track your protocol
When you are running multiple peptides, it is easy to lose track of doses, timing, and how you felt. Pep AI is built specifically for peptide and GLP-1 tracking — log doses, set reminders, monitor side effects, and keep notes on what is working.
Check out Pep AIYou have got this
Anxiety before the first injection is completely normal. Use a small needle, go slow, start with a low dose, and remember that subcutaneous injections are designed to be easy and low-risk. If you are unsure about your dose, stop and double-check your protocol before proceeding.
Compliance Notice
All compounds referenced on this site are intended strictly for in-vitro laboratory research. They are not approved for human consumption or clinical therapeutic use. Researchers are responsible for adherence to their institutional and regional regulatory frameworks.