Dose calculator

GHK-Cu dose calculator

Convert any GHK-Cu dose into syringe units in real time, pre-filled with a 50 mg / 5 mL example.

iPhone · Free to download

Last updated: May 13, 2026

Vial (mg)

Diluent (mL)

Dose (mg)

Dose unit

Draw on a U-100 syringe

20.0 units

Volume to draw

0.200 mL

GHK-Cu, also known as copper peptide, is a substance your body already makes, though levels decline as we age. People explore it for its potential roles in skin health, wound healing, and hair growth. Studies report that GHK-Cu can improve skin elasticity and firmness, and it is widely researched for its tissue remodeling abilities. This page breaks down what the research says about GHK-Cu, how people track its use, and the common protocols involved.

How the GHK-Cu dose calculator works

GHK-Cu (copper peptide) doses are 1-3 mg, taken 5 times per week for skin and tissue research. On a 50 mg vial mixed with 5 mL water (10 mg/mL), a 2 mg dose draws 20 units. Larger vial than most peptides, which lines up with the larger dose mass.

The formula is volume in mL equals dose mg divided by concentration mg/mL, then volume times one hundred to get units on a U-100 insulin syringe. With a 10 mg/mL GHK-Cu solution and a 2 mg dose, the draw is 0.20 mL or about 20 units. Type any other dose and the unit count updates in real time — no spreadsheets, no guesswork.

Inputs that genuinely matter: concentration (which only changes when you reconstitute a new vial) and dose mass. Syringe type matters too, but only because U-100 vs U-40 changes the multiplier — almost every modern insulin syringe is U-100, which is why the math defaults to that. Edge cases worth flagging: switching from mcg to mg without checking the input unit, or carrying yesterday's unit count over to a new vial that was reconstituted with a different volume of BAC water.

Figuring out the right dose is a key part of any self-directed peptide protocol. The dose calculator in Peptide Pilot is a tool to help you with the math. It’s not suggesting a dose for you, but rather helping you accurately measure the dose you have chosen to track. People’s goals and responses are unique, so there isn’t a one-size-fits-all number. Some people tracking GHK-Cu for skin benefits might use a different amount than those exploring it for hair or systemic wellness. This calculator simply takes the guesswork out of translating your target milligram dose into a usable volume on a syringe.

When you use the dose calculator, you’ll input the total amount of GHK-Cu in your vial (e.g., 50mg), the amount of diluent you added (e.g., 5mL), and the specific milligram dose you want to take (e.g., 2mg). The tool then instantly calculates the precise volume in both milliliters (mL) and syringe units that you need to draw. This is especially helpful because errors in dose calculation are a common pitfall. Using this tool for every dose ensures consistency and accuracy in your logbook, which is the foundation of effective personal research. It helps you be confident that what you’re logging is what you’re actually using.

Remember that many experienced users “titrate” their dose, meaning they start low and increase it slowly over time. The dose calculator is perfect for this. You can easily recalculate your syringe volume as you adjust your target dose from, say, 1mg to 1.5mg, and then to 2mg. It makes the process of gradual adjustment simple and exact. This allows you to pay closer attention to how your body feels at each level, without the mental overhead of doing manual math every time. The tool handles the numbers so you can focus on your personal observations.

Worked example

Walking one GHK-Cu dose through the math

The vial holds 50 mg of GHK-Cu, mixed into 5 mL of bacteriostatic water — concentration 10.00 mg/mL.
Your 2 mg dose ÷ 10.00 mg/mL = 0.200 mL of solution to pull.
Multiply by 100 (because U-100 means 100 units per mL): 0.200 × 100 = 20 units.
Double the dose to 4 mg and the unit count doubles to 40 — the relationship is linear at a fixed concentration.
Change the diluent volume and every one of these numbers moves; change the dose alone and only the last one does.

GHK-Cu titration ladder at this concentration

What different GHK-Cu dose steps draw on a U-100 insulin syringe at the example 10.00 mg/mL concentration.

Dose (mg)	Volume (mL)	Units (U-100)
1	0.100	10
2	0.200	20
4	0.400	40
8	0.800	80

Doubling the GHK-Cu dose doubles the unit count. Halving it halves the count. Step-ups under 5 units are hard to read accurately — re-reconstitute with more water if your titration hits that range.

Scenarios people actually run into

Three things that come up logging GHK-Cu

You're sitting at the 2 mg GHK-Cu step and your prescriber bumps you up. The new dose is double — 40 units instead of 20. Same vial, same syringe, twice the volume on the line.
Your fingers reach for the syringe and the unit count from last week is still in your head. Half the time that number is fine; the other half, the vial changed and the right answer moved. The calculator is the second pair of eyes.
You skipped a week. GHK-Cu cadence is 5 doses per week, and doubling up to "catch up" almost never reads how people expect — log the skip, then log the next normal dose.

Same-category neighbor

GHK-Cu next to TB-500

Both sit in the Skin / Healing bucket — here's the dose math side by side on each one's example vial.

	GHK-Cu	TB-500
Example dose	2 mg	2 mg
Concentration	10.00 mg/mL	2.50 mg/mL
Units to draw	20	80

Want the full breakdown? TB-500 reference →

How GHK-Cu dosing is tracked

When people begin tracking GHK-Cu, they often start with a conservative protocol to see how their body responds. A common starting point for subcutaneous use is a dose of 1mg per day. This allows the user to monitor for any immediate reactions, such as irritation at the injection site, which is one of the more frequently reported side effects. After a week or two at a low dose with no issues, some users will gradually titrate their dose upwards. For example, they might increase the dose by 0.5mg every week until they reach their target dose, which is often around 2mg per day. This slow-and-steady approach is a common harm-reduction strategy in the biohacking community, as it minimizes the risk of overwhelming the body and makes it easier to pinpoint the cause of any unwanted effects.

The cadence of GHK-Cu application is another important aspect of user protocols. While daily subcutaneous injections are common, some people opt for an every-other-day schedule to give their body a rest. Another approach is to follow a cycle, such as using the peptide for five days and then taking two days off, similar to a typical work week. The duration of a full GHK-Cu cycle also varies. Some might run a cycle for 4-6 weeks, followed by an equally long "off" period to allow their body to normalize. Others may opt for longer cycles of 3-6 months, especially when addressing more persistent, long-term goals related to skin or hair. The choice of cadence and cycle length is highly individual and is typically based on the user's personal goals, observations, and how they feel during the process.

Beyond injectable methods, topical application is another popular protocol, especially for those focused purely on skin benefits. In this approach, a GHK-Cu solution is applied directly to the face or other areas of concern. This can be done by mixing a small amount of reconstituted peptide with a neutral, water-based serum or by purchasing pre-formulated cosmetic products. When applied topically, the peptide works directly on the skin cells it contacts. Some users combine both methods, using a lower-dose daily injection for systemic benefits while also applying a GHK-Cu serum to their face for a more targeted skin effect. Regardless of the protocol, detailed logging in an app like Peptide Pilot is crucial for keeping track of the moving parts, including dose, frequency, application method, and the subtle changes observed over weeks and months.

Common GHK-Cu dose-calculation mistakes

Forgetting to wipe the vial tops with an alcohol swab before drawing a dose.
Calculating the dose based on the wrong concentration after reconstitution.

Frequently asked questions about GHK-Cu dose calculator

How does the GHK-Cu dose calculator turn mg into syringe units?

It runs two divisions in sequence. First it computes concentration (vial mg ÷ diluent mL) — for the example here that's 50 ÷ 5 = 10.00 mg/mL. Then it divides your dose by that concentration to get volume in mL, and multiplies by 100 to convert volume into U-100 syringe units. The output updates as you type so you can sanity-check before drawing. GHK-Cu is one of the few peptides where mg-scale doses are normal — don't confuse it with mcg-scale GH-secretagogues.

Does the GHK-Cu dose calculator know which syringe I'm using?

It assumes a U-100 insulin syringe — the most common type for sub-cutaneous peptide injections. U-100 means 100 units per mL. If you're using a U-40 syringe (rare outside veterinary contexts) the unit count is wrong by a factor of 2.5. Tuberculin syringes read in mL directly, so on those just use the volume figure. GHK-Cu is one of the few peptides where mg-scale doses are normal — don't confuse it with mcg-scale GH-secretagogues.

Why does the same GHK-Cu dose pull a different unit count today than last week?

Because either the vial or the diluent volume changed. Concentration depends on both. A 5 mg vial reconstituted with 1 mL is twice as concentrated as the same vial with 2 mL — same dose, half the units. Whenever you open a fresh vial, run the dose math again rather than carrying the prior count over. GHK-Cu is one of the few peptides where mg-scale doses are normal — don't confuse it with mcg-scale GH-secretagogues.

What if my GHK-Cu dose lands at fewer than 5 units?

That's the calculator telling you the current vial is too concentrated for the dose you want. Five units on a U-100 syringe is hard to read accurately — the markings get tight. Reconstitute the next vial with more bacteriostatic water (commonly 2 mL instead of 1 mL) so each dose covers a larger, cleaner volume. GHK-Cu is one of the few peptides where mg-scale doses are normal — don't confuse it with mcg-scale GH-secretagogues.

Related on Peptide Pilot

Log every GHK-Cu dose in the app

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