Getting Started with Peptides — Your Complete First-Timer's Guide

A step-by-step guide for anyone new to peptide research. Everything you need to know before your first reconstitution and injection.

Step 1: Gather Your Supplies

Before you do anything else, make sure you have everything:

Essential (You Cannot Start Without These)

• Peptide vial(s) — Your chosen peptide from Peptide Shop UK
• Bacteriostatic water (BAC water) — 10mL vials. This is NOT the same as sterile water. BAC water contains 0.9% benzyl alcohol as a preservative, allowing multiple draws from the same vial over 28 days.
• Insulin syringes — We recommend starting with 0.5mL (50 unit) syringes. They're versatile enough for most peptides.
  • 0.3mL (30 unit): Best for tiny doses (Semax, Selank, CJC/IPA at low doses)
  • 0.5mL (50 unit): Best all-rounder (BPC-157, TB-500, moderate doses)
  • 1.0mL (100 unit): Best for larger doses (NAD+, Tirzepatide, TB-500 loading)
• Alcohol swabs — Individually wrapped, for wiping vial tops and injection sites
• Sharps bin — Legal requirement in the UK for safe needle disposal. Available from pharmacies.

Recommended (Makes Life Easier)

• Small labels or marker pen — For labelling reconstituted vials (peptide name, date, concentration)
• Notebook or phone app — For tracking doses, timing, and effects
• Clean, flat workspace — A clean counter or desk for reconstitution

Step 2: Which Syringe for Which Peptide?

Rule of thumb: If your dose requires less than 5 units on a 100-unit syringe, use a smaller syringe for better precision.

Step 3: How to Reconstitute (Mix Your Peptide)

This is the most important skill to learn. Take your time the first time.

What You Need

• Your peptide vial (powder/lyophilised form)
• BAC water vial
• A fresh, clean syringe
• Alcohol swabs

Step-by-Step Instructions

1. Wash your hands thoroughly with soap and water

2. Wipe both vial tops with separate alcohol swabs. Let air dry (10 seconds).

3. Draw BAC water into your syringe:

   • Insert needle into BAC water vial
   • Turn vial upside down
   • Pull plunger to desired amount (check your peptide's guide for how much)
   • Remove any air bubbles (tap syringe, push plunger slightly)

4. Add water to peptide vial:

   • Insert needle into peptide vial
   • AIM THE STREAM AT THE GLASS WALL — let water trickle down the side
   • DO NOT squirt water directly onto the powder (can denature the peptide)
   • Push plunger slowly and steadily

5. Let it dissolve:

   • Remove the syringe
   • Swirl gently — tilt and rotate the vial
   • NEVER shake — shaking can break peptide bonds and ruin the product
   • If slightly cloudy, set on a flat surface for 5 minutes. Should become clear.

6. Label the vial: Write the peptide name, date, and concentration

   • Example: "BPC-157 | 16 Feb 2026 | 2,500mcg/mL"

7. Refrigerate immediately (2-8°C)

Common BAC Water Amounts

Step 4: Calculate Your Dose

The Universal Formula

Three steps, every time:

1. Concentration = Vial size (mg) × 1000 ÷ BAC water added (mL) = mcg/mL

2. Volume to draw = Your dose (mcg) ÷ Concentration (mcg/mL) = mL

3. Syringe units = Volume (mL) × Total syringe units

Worked Example: BPC-157 Starter Dose

• Vial: 5mg. BAC water: 2mL.
• Concentration: 5 × 1000 ÷ 2 = 2,500 mcg/mL
• Want 250mcg: 250 ÷ 2,500 = 0.1mL
• On a 100-unit syringe: 0.1 × 100 = 10 units
• On a 50-unit syringe: 0.1 × 50 = 5 units

Worked Example: Semaglutide Starter

• Vial: 5mg. BAC water: 2mL.
• Concentration: 5 ÷ 2 = 2.5mg/mL (or 2,500mcg/mL)
• Want 0.25mg: 0.25 ÷ 2.5 = 0.1mL
• On a 100-unit syringe: 0.1 × 100 = 10 units

Pro tip: Use our online calculator

Don't want to do the maths? Use the Peptide Shop UK Dosage Calculator → — select your peptide, enter your BAC water amount, pick your dose, and it tells you exactly how many units to draw.

Step 5: Your First Injection

Before You Inject

• Reconstituted vial from fridge (can let warm 1-2 minutes — room temp stings less)
• Fresh, sterile insulin syringe (never reuse syringes)
• Alcohol swab
• Calm, well-lit space

Drawing Your Dose

1. Wipe the peptide vial top with alcohol swab
2. Insert syringe needle into vial
3. Turn vial upside down
4. Pull plunger to your calculated units
5. Check for air bubbles — tap syringe gently, push plunger slightly to expel air
6. Remove from vial

Injection Technique (Subcutaneous)

1. Choose your site: Belly fat (most common — 2 inches away from navel), outer thigh, or back of upper arm
2. Clean the site with alcohol swab. Let air dry completely (10 seconds).
3. Pinch the skin — grab a fold of skin and fat between thumb and forefinger
4. Insert the needle at a 45-degree angle (90° if you have more subcutaneous fat)
5. Push the plunger slowly and steadily — don't rush
6. Wait 5 seconds before withdrawing the needle (ensures full dose delivered)
7. Withdraw and apply light pressure with a clean swab. Don't rub.
8. Dispose of syringe in sharps bin immediately

Injection Site Rotation

Rotate your injection sites to prevent irritation and lipodystrophy (tissue changes from repeated injections in same spot):

• Abdomen: Divide into 4 quadrants around the navel. Rotate clockwise.
• Thighs: Alternate left and right, front of thigh
• Arms: Upper arm fat pad, alternate sides
• Rule: Never inject in the exact same spot twice in a row

Step 6: Storage

Golden rules:

• Always refrigerate after reconstitution
• Never freeze reconstituted peptides
• Never leave reconstituted vials at room temperature
• Label every vial with contents, date, and concentration
• Discard if solution becomes cloudy, discoloured, or has particles

Step 7: Common Mistakes (Avoid These)

1. Squirting BAC water directly onto powder → Always aim down the glass wall
2. Shaking the vial → Swirl gently. Shaking breaks peptide bonds.
3. Using sterile water instead of BAC water → Sterile water has no preservative. Must use within 24-48 hours. BAC water lasts 28 days.
4. Reusing syringes → Never. Fresh syringe every injection. Bacteria and dull needles cause problems.
5. Not rotating injection sites → Rotate to prevent tissue damage
6. Storing reconstituted peptides at room temp → Must refrigerate. Peptides degrade rapidly at room temperature.
7. Skipping alcohol swabs → Always clean vial tops and injection sites. Infection prevention.
8. Guessing doses → Always calculate. Use our calculator if maths isn't your thing.
9. Starting multiple peptides simultaneously → Start one at a time. If you react to something, you need to know which peptide caused it.
10. Expecting overnight results → Most peptides take 2-4 weeks to show noticeable effects. Be patient and consistent.

Your First Week Timeline

Day 1

• Reconstitute your first vial ✅
• Calculate your dose ✅
• Do your first injection ✅
• Log: time, dose, injection site, how you feel

Day 2

• Second injection (if daily protocol)
• Note any injection site reactions (redness, mild swelling = normal)
• Technique will feel easier already

Day 3-5

• Getting into routine
• Injection technique improving with each dose
• Start noting any early effects (varies by peptide)
• Keep logging

Day 6-7

• First week complete ✅
• Review your notes — any patterns?
• Check injection sites — rotate as planned
• Assess: Any concerns? Side effects? If so, check your peptide's course guide.

What to Expect by Peptide Type

Still Have Questions?

• Use Our Dosage Calculator →
• Browse All Course Guides →
• Read the Stacking Guide →
• Compare Peptides →
• Download the Starter Guide PDF →

⚠️ Disclaimer: This guide is for research and educational purposes only. Peptide Shop UK sells peptides strictly for research use. This content does not constitute medical advice. Always consult with a qualified healthcare professional before beginning any research protocol.