Why Hair Falls Out in the First Place

Hair grows in cycles: anagen (growth), catagen (transition), telogen (rest and shedding). Normally about 85-90% of your hair sits in the growth phase. But your body can shift that ratio fast when it decides resources are needed elsewhere.

Telogen effluvium is when too many follicles drop into the resting phase at the same time. Triggers include rapid weight loss, surgery, severe stress, protein deficiency, hormonal shifts. And here's the thing — patients on GLP-1 agonist therapy (tirzepatide, semaglutide, retatrutide) run into this a lot. Fast weight loss is physiological stress. Plus the caloric deficit often means not enough protein and micronutrients.

Age adds another layer: blood supply to the scalp deteriorates. Follicles get less oxygen and fewer nutrients. Miniaturization — when a thick terminal hair gradually becomes a thin vellus hair — is largely a blood flow story.

Standard treatments like minoxidil work through vasodilation. But they don't address inflammation around the follicle or repair damaged dermal papilla cells. That's the gap peptides fill.

Four Peptides, Four Mechanisms

BPC-157 — Blood Supply to Follicles

[[BPC-157|22]] is a 15-amino-acid peptide originally isolated from gastric juice. Its superpower for hair is angiogenesis. It upregulates VEGF (vascular endothelial growth factor) and boosts nitric oxide (NO) production. Essentially, BPC-157 builds new capillaries and widens existing ones.

This matters for follicles. Every hair papilla is surrounded by a capillary network, and the denser that network, the thicker and faster the hair grows. BPC-157 also speeds up tissue healing — useful if you're incorporating microneedling into your protocol.

TB-500 — Cell Migration to Damaged Follicles

[[TB-500|25]] is a synthetic fragment of thymosin beta-4, a protein involved in healing virtually any tissue. The key mechanism is actin binding — it latches onto the cytoskeletal protein that allows cells to physically crawl toward injury sites.

When a follicle is damaged by inflammation or mechanical stress, TB-500 directs stem cells and keratinocytes to the damage zone. It also reduces inflammation and fibrotic tissue formation. And here's what matters: scarring around the follicle is one reason hair stops growing permanently. TB-500 helps prevent that.

GHK-Cu — The Dermal Papilla Star

[[GHK-Cu|24]] is a tripeptide bound to a copper ion. It's arguably the most studied peptide for hair growth specifically. It directly stimulates dermal papilla cells — the cells that tell the follicle to grow.

The numbers are striking. In mouse studies, GHK-Cu outperformed minoxidil: hair transplant growth increased by 50%, and shedding rates dropped from 30% to 10%. But the scope of GHK-Cu goes well beyond a single mechanism. This peptide modulates the expression of over 4,000 genes — including those responsible for follicle stem cell activation, collagen synthesis, and extracellular matrix remodeling.

GHK-Cu works both systemically (subcutaneous injections) and topically for hair. Applied locally, it penetrates scalp skin and acts directly in the follicle zone.

KPV — The Anti-Inflammatory Shield

KPV is a tripeptide (Lys-Pro-Val), a fragment of alpha-melanocyte-stimulating hormone. Its role in the protocol is clearing inflammation around follicles. Chronic micro-inflammation of the scalp is an underrated cause of hair loss. Redness, itching, dandruff — these are all markers of an inflammatory process slowly killing follicles.

KPV suppresses the NF-kB signaling pathway — one of the central switches for inflammation in the body. And it has excellent topical absorption: the molecule is small enough to penetrate skin easily. So KPV is especially effective in topical formulations and when injected directly into the scalp.

Dr. Kuo's Protocol: 50,000+ Patients

Dr. Kuo at Extension Health is one of the pioneers of peptide therapy for hair. His practice has treated over 50,000 patients. His approach is a combined assault on every front.

The core protocol includes:

• Scalp microneedling with exosomes + a cocktail of BPC-157, TB-500, GHK-Cu and KPV injected directly into the scalp
• Systemic subcutaneous course of the same peptides — 3 months
• Stellate ganglion block — for vasodilation in the head and neck area
• Hyperbaric oxygen therapy — saturating tissues with oxygen

Obviously the ganglion block and hyperbaric chamber are clinical procedures. But the foundation of the protocol — peptides plus microneedling — can be adapted for home use.

Simplified Home Protocol

Not everyone has access to a clinic like Extension Health. But you can build an effective protocol on your own. Here's what works:

• [[KLOW|20]] subcutaneous — 3-month course. KLOW already contains BPC-157, TB-500, GHK-Cu and KPV in one vial. No need to mix four separate peptides. For convenience there's the [[KLOW pen|39]] — a prefilled pen, no syringe hassle.
• Topical GHK-Cu — apply to scalp daily. Works locally, stimulates the dermal papilla directly.
• Minoxidil 5% — the classic, dilates scalp blood vessels. Combined with peptides the effect is synergistic.
• Scalp massage 5 minutes daily — improves microcirculation. Use a silicone massager or just your fingers.
• Red light therapy (630-670 nm) — stimulates follicle cell mitochondria. 10-15 minutes every other day.

Peptide shelf life after reconstitution is 90 days refrigerated. Plan your course accordingly.

KLOW vs GLOW: Which One for Hair

This comes up a lot. Both [[KLOW|20]] and [[GLOW|23]] are peptide blends from Peptex. But for hair growth specifically, KLOW is the better choice. Simple reason: KLOW contains KPV — the anti-inflammatory peptide that's critical for follicle health. GLOW doesn't have it.

If your primary goal is hair, go with [[KLOW|20]]. GLOW is more geared toward skin and general recovery.

Nutrition: The Foundation Peptides Can't Replace

You can inject the best peptides for hair growth, but if your body doesn't have the raw materials to build keratin, results will be limited. Hair is 95% protein. Minimum requirements for supporting growth:

• Protein: 130-150g per day. That's a lot. But if you're serious about results, you need to track it.
• Biotin: 5-10mg daily. Involved in keratin synthesis.
• Zinc: 15-30mg. Zinc deficiency is directly linked to telogen effluvium.
• Ferritin: get your levels checked. Optimal is above 70 ng/mL. Low ferritin means less oxygen reaching follicles.
• Omega-3: 2-3g EPA/DHA daily. Anti-inflammatory effect plus scalp skin nourishment.

And if you're in a caloric deficit (weight loss, GLP-1 therapy) — protein becomes even more critical. When resources are scarce, your body sacrifices what isn't essential for survival first. Hair is at the top of that list.

Realistic Timeline

What to expect on the full protocol (peptides + nutrition + topical therapy):

• ~8 weeks: shedding slows down. Fewer hairs on your pillow and in the drain.
• ~4 months: baby hairs appear — fine new growth along the hairline and in thinning areas.
• ~6 months: recovery to 85-90% of previous density. New hairs thicken and gain pigment.

But there's a condition: you have to stick with the protocol without breaks. Skip a month and you slide back a step. Follicles don't forgive inconsistency.

If You're on GLP-1 Therapy

Tirzepatide, semaglutide, [[Retatrutide|11]] — all GLP-1 agonists can trigger telogen effluvium. Not because the drugs are toxic to hair, but because rapid weight loss is stress on the body.

The recommendation: start [[KLOW|20]] from day one of GLP-1 therapy. Don't wait until hair starts falling out — prevention is far more effective than treatment. And control your rate of weight loss: aim for 0.5-1% of body weight per week. Aggressive deficits accelerate hair loss.

Also make sure you're getting enough protein. GLP-1 suppresses appetite, you don't feel like eating — but 130-150g of protein daily is non-negotiable. A protein shake in the morning if solid food doesn't appeal.

Why a Pre-Made Blend

You could buy [[BPC-157|22]], [[TB-500|25]], [[GHK-Cu|24]] separately. That works. But there are practical downsides: four vials, four reconstitutions, four dosage calculations, four injections. Every day.

[[KLOW|20]] solves the logistics. All four peptides in the right proportions, one injection. Peptex calculated the dosages so each component sits in its therapeutic range. And the [[KLOW pen|39]] makes the process even simpler — prefilled pen, dial your dose, inject, done.

If you have questions about the protocol or dosing for your specific situation, reach out to support. We'll help you figure it out.