GHK-Cu Dosage: How Pepti Prescribes the Injection, in Units, mL and mg

Every price is all-in, covering medication, physician review, refill management and shipping, with no separate membership fee. Pepti is cash-pay and does not bill insurance. These are the typical printed directions; your own directions are the ones on your vial.

Pepti's directions are written in two forms, millilitres and units, because prescriptions are written in millilitres and insulin syringes are marked in units. On a U-100 insulin syringe, 1 unit is 0.01 mL, so 100 units is 1 mL and 25 units is 0.25 mL. A unit is a volume mark on the barrel, not a measure of how strong the medication is.

The milligram figure comes from the concentration on the label. Pepti's GHK-Cu is supplied at 10 mg/mL, so:

That arithmetic is a way to read a label, not a way to set a dose. A vial labelled 50 mg is not a 50 mg dose: it is twenty 2.5 mg doses. If your label and your syringe seem to disagree, do not dose; message your care team. How long does a peptide vial last explains every number on a vial label in more detail.

Online GHK-Cu dosing advice mixes micrograms, milligrams and units, and the numbers only line up if you know the concentration. A "20 units" figure from a forum may refer to a solution of a completely different strength. The chart below is the conversion for a 10 mg/mL vial, drawn with a U-100 insulin syringe. It is math only. It is not a menu of doses, and the only line that applies to you is the one that matches the number printed on your vial.

At 10 mg/mL, every unit on the syringe carries 0.1 mg of GHK-Cu. That is a much higher concentration than most of Pepti's single peptides, which is why a GHK-Cu number cannot be carried over from another vial, and why a number from a different product is never a guide to this one.

GHK-Cu appears in more Pepti products than any other single peptide. Each one is a 5 mL vial with GHK-Cu at 10 mg/mL, drawn at 0.25 mL, 20 doses per vial. The timing printed on the label differs between products.

Two things stand out. First, the GHK-Cu per dose never changes: every product in the chart delivers 2.5 mg in 25 units. Second, because every one of them carries a full GHK-Cu dose, two of them at once means twice the copper. That is the most common way people end up on more GHK-Cu than intended, and it is why the intake asks about every product you use.

In a blend, every ingredient is in fixed proportion. One draw delivers all of them in the ratio the pharmacy compounded, and there is no way to take more GHK-Cu and less of something else from the same vial. If a different balance is wanted, that is a different prescription. The KLOW split is set out in KLOW dosage, and the two repair blends are compared in KLOW vs GLOW.

Vials are multi-dose solutions shipped ready to use, refrigerated with ice packs, with sterile syringes and alcohol prep pads. Nothing is mixed at home. Keep the vial in the fridge and follow the beyond-use date printed on the label, which runs from first puncture. How to store peptides covers storage.

If a vial runs short before the refill, message your care team rather than adjusting anything yourself. If you miss a weekday dose, follow your directions and do not take two doses to make up for one.

Your physician sets your directions after reviewing your intake. Things that can lead to different directions, or a different product, include:

When directions change, the new numbers are printed on the new label. Never carry a number over from a previous fill. Bloodwork is not required for any Pepti treatment. If your physician wants labs for your care, they'll ask through your account.

The full picture is in is GHK-Cu safe.

Who should not take GHK-Cu, or should discuss it first: anyone with Wilson's disease or another copper-metabolism disorder, anyone with significant liver disease, anyone on high-dose zinc, anyone already using another GHK-Cu product, anyone with an active or recent cancer, and anyone pregnant or breastfeeding. There is no established interaction list, which is why the intake asks for every medication and supplement you take.

There is no trial-derived dose for injectable GHK-Cu. The human studies were topical, so they say nothing about how many milligrams to inject. The mouse studies that used systemic dosing were efficacy models, not dose-finding studies for people. And no one has published how long injected GHK-Cu circulates under the skin, how the copper partitions once the peptide is cleared, or whether weekday dosing produces any accumulation.

What exists instead is a prescribing convention: a small subcutaneous volume on weekdays, at a dose whose copper content is a small fraction of what an ordinary diet supplies and that a working liver excretes. Pepti's 2.5 mg direction sits inside that convention. It is a reasonable basis for a physician to prescribe; it is not evidence that 2.5 mg is better than any other amount, and no page that quotes an "optimal" GHK-Cu dose has a trial behind it.

GHK-Cu is a compounded prescription, and compounded medications are not FDA approved. The FDA removed injectable GHK-Cu from Category 2 of its interim 503A bulks list on 15 April 2026 and has said its Pharmacy Compounding Advisory Committee will review GHK-Cu before the end of February 2027. It remains legal to prescribe and dispense.

GHK-Cu cannot be bought legitimately without a prescription. Sites selling it "for research use only" are not accountable for what is in the vial: identity, purity, sterility and concentration are untested, and an unknown concentration makes any unit number meaningless. The prescription route:

1. Complete a free online intake covering your history, medications and what you want help with.
2. A physician licensed in your state reviews it, usually within 24 hours.
3. If it is appropriate, a PCAB-accredited, FDA-registered US 503A compounding pharmacy prepares it to that prescription. Lot test results are published at /quality/lab-results.
4. It ships refrigerated with your directions printed on the vial.
5. Your physician stays reachable for questions and dose changes.

Pepti prescribes GHK-Cu in every state except Oklahoma, plus DC Step by step: how to get GHK-Cu prescribed online. The full product reference is what is GHK-Cu, and what to check on any seller is in where to buy GHK-Cu online.