How do I work out how many units to draw?

Divide the peptide in the vial (in mcg) by the water you added (in mL) to get the concentration in mcg per mL. Divide your dose (in mcg) by that concentration to get the mL to draw. On a U-100 insulin syringe, 1 mL equals 100 units, so multiply the mL by 100.

Which peptide is good for skin?

GHK-Cu, a copper peptide, is the one most studied for collagen, skin repair and hair.

Which peptide is good for sleep?

Epitalon is studied for melatonin rhythm and deeper sleep, and is one of the classic longevity peptides.

Which peptides help with brain fog?

Selank and Semax are often stacked together. Selank is studied for calm focus, Semax for focus, memory and mental energy.

How many mcg are in 1 mg?

1 mg equals 1,000 mcg. A 5 mg vial holds 5,000 mcg.

Free peptide guide + calculator

Tell me what you need. I'll show you the peptide.

Better skin, deeper sleep, a clear head, a body that recovers. Find the peptide for what you're feeling, then see exactly how many units to draw. No guessing, no math at midnight.

Show me what helps

Caleigh's morning ritual with a peptide vial and lemon water

How are you feeling?

Start with what you need, not the science.

Tap "Calculate" on any peptide and the calculator below sets itself up for it.

"I want better skin."

The Glow Stack

GHK-CuA copper peptide your skin makes less of every year. Studied for collagen, firmness and hair.

"I can't sleep. I'm up at 3 am."

The Deep Sleep Stack

EpitalonStudied for melatonin rhythm and deeper sleep. One of the classic longevity peptides.

"My head is foggy. I want to feel clear and sharp."

The Clear Mind Stack

SelankStudied for calm focus and a quieter mind, without feeling sedated.
SemaxStudied for focus, memory and mental energy. The pair is often taken together.

"My body aches. I'm healing an injury."

The Repair Stack

BPC-157Studied for tendon, tissue and gut repair.
TB-500Studied for recovery, flexibility and healing.

"My gut is a mess."

The Gut Reset

BPC-157Studied for repairing the gut lining.
KPVStudied for calming gut inflammation.

"I'm flat by 2 pm. My metabolism is slow."

The Energy Stack

MOTS-cStudied for metabolism and how your cells turn food into energy.
NAD+Studied for cellular energy. Your levels drop as you age.

"I want to age slower."

The Longevity Stack

EpitalonSleep rhythm and cell aging.
NAD+Cellular energy that drops with age.
GHK-CuSkin, collagen and repair.

"I want to lose the stubborn weight."

The Metabolic Reset

Retatrutide or TirzepatideThe GLP-1 family. Studied for appetite, blood sugar and weight loss.

See your doctor first. These are prescription strength and need medical supervision, bloodwork and a slow dose plan.

Reconstitution calculator

How many units to draw.

1. Which peptide?Sets the usual vial sizes

2. How much is in the vial?On the label, in mg

Other: mg

3. How much bacteriostatic water did you add?In mL

Other: mL

4. Your doseThe dose your provider gave you

5. Which insulin syringe?Both are U-100

Draw to

Concentration

Doses per vial

In every unit

Print your 30 day dose tracker

Filled in with your numbers above. Print it or save it as a PDF.

Where I get mine

Elite Bioscience, code CALEIGH.

The peptides I use, at a fraction of typical US prices. Your code is applied through my link.

Shop Elite Bioscience

Affiliate link: I earn a commission if you buy, at no extra cost to you.

How the math works

Concentration: peptide in the vial (mcg) ÷ water added (mL) = mcg per mL.
Amount to draw: your dose (mcg) ÷ concentration = mL.
Units: on a U-100 insulin syringe, 1 mL = 100 units, so mL × 100 = units.

Adding more water doesn't change your dose. It spreads the same peptide through more liquid, so you draw more units for the same amount.

Education and math only. Not medical advice. This page shares what each peptide is studied for and converts your numbers. It doesn't recommend a dose. Many peptides are sold for research use and are not approved by the FDA for human use. Talk to your doctor before taking anything, and always check your numbers against your own label.