Updated October 29, 2026.

Please note: because it's a blend, the Klow Stack is not part of the Oct 28 HHS policy, which covers single-peptide products only.

What is the Klow Stack?

The Klow Stack combines four peptides in one product:

  • BPC-157, one of the most talked-about peptides for recovery
  • GHK-Cu, a copper peptide best known for skin and collagen support
  • KPV, a tiny three-amino-acid peptide being studied for gut and inflammation balance
  • TB-500, a synthetic fragment of thymosin beta-4, a peptide your body makes naturally

It's the Glow Stack with KPV added.

What the research is looking at

Together, these peptides are being studied for their roles in:

  • Skin and hair
  • Gut and immune system balance
  • Tissue repair and recovery
  • Inflammation balance

Most of the research so far has been on each peptide on its own, largely in the lab and in animals. The combination itself has not been studied in clinical trials, and human data on all four is limited.

Who it may be for

Adults who want skin, gut and recovery support in one product often ask about the Klow Stack.

Results vary from person to person, and our provider will talk with you about realistic expectations.

Regulatory status: please read

On October 28, 2026, HHS announced an interim enforcement policy for six single peptides, including BPC-157, TB-500 and KPV.

That policy covers single-peptide products only. Blends, including the Klow Stack, are not part of it. GHK-Cu is not part of that policy in any form, and KPV is covered only in topical and oral forms.

The Klow Stack is a compounded blend. It is not FDA-approved, and it's prescribed at our provider's discretion. Its availability depends on our compounding pharmacy partner and may change as FDA rules develop.

If the blend isn't available or isn't right for you, our provider can talk with you about the individual peptides instead.

Read the full FDA update

Safety and side effects

Side effects reported with these peptides can include:

  • Redness, itching or soreness where it's given
  • Headache or tiredness
  • Nausea or dizziness

The Klow Stack may not be right for you if:

  • You're pregnant, breastfeeding or trying to conceive.
  • You're under 18.
  • You have active cancer or a history of cancer.
  • You have Wilson's disease or another copper-related condition.

Our provider will review your health history before prescribing.

Good to know

  • BPC-157 and TB-500 are both on the WADA prohibited list. If you're tested in your sport, check before starting.

How it works at Optimize Hormone

Optimize Hormone offers these prescription peptides from an FDA-inspected 503(a) pharmacy in the US, with full testing reports, delivered directly to your home.

Our approach to peptide therapy is personalized and provider-guided, designed to support recovery, performance, longevity and overall wellness.

  • Bloodwork membership not required for peptides.
  • Complete your online intake, or book a free consultation if you'd like to talk it through first.
  • Our provider reviews your health history and goals and determines whether the Klow Stack is appropriate for you.
  • If prescribed, your medication ships to your door with all necessary supplies, plus personalized dosing and instructions from your licensed provider.

How it's delivered

Your prescription arrives pre-mixed and ready to use, with all the supplies you need.

Our provider will walk you through how and when to use it.

Monthly membership: $175/month

Book your free consultation

Start your intake

Common questions

How is the Klow Stack different from the Glow Stack?

The Klow Stack adds KPV, which is being studied for gut and inflammation balance. Otherwise the two are the same.

Why a blend instead of single peptides?

Some patients prefer one product instead of several. A blend isn't part of the Oct 28 HHS policy, so our provider can also talk with you about single peptides.

When might I notice a difference?

It varies by person and goal. Our provider will set realistic expectations with you.

Do I need bloodwork?

A bloodwork membership is not required for peptides. Our provider may recommend labs based on your health history.

How to get started

1. Complete the short online intake.

2. Or book a free consultation if you'd like to talk it through first.

3. Our provider reviews your answers and lets you know whether the Klow Stack is a fit for you.

More peptides

Educational information only, not medical advice. Compounded medications are not FDA-approved, which means FDA does not review their safety, effectiveness or quality before they are dispensed. Our provider determines whether any medication is appropriate for you. Regulatory information is current as of October 29, 2026 and may change. Prescriptions are filled by a state-licensed 503(a) compounding pharmacy in the US.