Hair-wash day, without the dread
Right now you wash and then you count — your hands, the drain, whether today was worse than last week. Imagine just washing your hair. Rinsing. Getting out.
Made for the 4-month shed
Postpartum shedding
Support your hair through the four-month shed.
Signal 5 is a five-peptide scalp serum made for the shed that arrives a few months after birth. Drug-free, hormone-free, nothing swallowed. Sixty seconds a day, right where the follicles are.
- Five biomimetic peptides delivering growth-phase signals straight to the scalp
- Supports the appearance of thicker, fuller-looking hair
- Ten actives, every one named on the label — take the list to your doctor
- Non-greasy and colour-safe — goes on at night, forgotten by morning
Is there anything in it I can’t use while nursing?
Signal 5 contains no drugs, no minoxidil and no hormones. Nothing is ingested and it’s applied only to the scalp. Every one of the ten actives is printed on the bottle rather than hidden in a blend, so you can take the list straight to your doctor or lactation consultant — which is exactly why we publish it in full.
When will I see something?
Eight to twelve weeks for most women. The first thing you’ll notice is what’s not in the drain — the shed easing usually shows up before any new growth does.
Will it make my hair greasy?
No — it’s a lightweight scalp serum, not an oil. One dropper, ten seconds, style or sleep as normal. Colour-safe, because it goes on the scalp rather than the lengths.
What’s actually in it?
Ten actives: sh-Polypeptide-1, -9, -11, sh-Oligopeptide-2, -10, arginine, rosemary, saw palmetto, Scutellaria baicalensis and eucalyptus. Full detail further down.
How easy is it to cancel?
Two clicks in your account. You can also pause or push the next delivery back a month.
Nearly every mother goes through it. Almost none are told first.
The four-month shed is one of the most common experiences after birth and one of the least discussed.
91.8%
of mothers in a 2023 study reported postpartum hair shedding
2.9 mo
average time before it starts
5.1 mo
when it typically peaks
67%
say they were shocked by how much they lost
Hirose A, Terauchi M et al., International Journal of Women’s Dermatology, June 2023 — 304 respondents. Shock figure: Hers survey.
The Signal Crash
Your follicles didn’t quit. They all hit snooze at the same time.
This is the part that explains the timing — and it’s why the shed arrives months after birth rather than immediately.
-
01
Pregnancy held the door open
High estrogen keeps thousands of hairs in the growth phase well past their normal exit. That’s the thick pregnancy hair everyone compliments.
-
02
Birth pulled the signal
Estrogen falls sharply. Every hair being held past its exit is released into the resting phase — all of them, together.
-
03
They let go at once
Two to four months later they clear out simultaneously. Same hairs, same cycle — synchronised, which is why it feels catastrophic rather than gradual.
-
04
The follicles are still there
This isn’t damage. It’s a scheduling event. Which means the useful question is what you give your scalp on the way back.
The Two-Signal Approach
Two things support a scalp coming back: the message that says grow, and the conditions that make it easy to. Signal 5 delivers both, in one dropper, straight to the scalp.
Signal 1: Five biomimetic peptides
Your body talks to follicles using peptides — short chains of amino acids carrying the instructions to grow, rest and shed. Signal 5 contains five biomimetic peptides: lab-made copies of those same signalling proteins. Applied to the scalp, they arrive where the follicles are instead of travelling through your whole body first.
Signal 2: A scalp built for regrowth
New growth comes in easier on a well-conditioned scalp. Arginine supports microcirculation — blood flow to the follicle. Rosemary, the most-studied botanical in this category, supports the scalp environment. Scutellaria calms. Eucalyptus gives the clean, cool finish you’ll feel on application.
One sends the message. The other makes the ground good.
Pills travel through your whole body to reach your scalp. This goes straight there.
Choose your supply
In stock · ships from the US
What you’re working toward
Three small moments you’d like back.
Baby hairs at your hairline
Short, fine, standing straight up and refusing to be styled. Annoying, and the best thing you’ll see all month — because that’s what new growth looks like coming in.
Being in the photo
Not angling away. Not checking the light. Just being in the picture with your baby, because you feel like yourself in it.
Sixty seconds a day, while they nap.
That’s the whole routine.
Your next twelve weeks
What you get to look forward to.
Mark the calendar. This is the sequence most women report, in the order they report it.
The cool, clean feeling
You’ll notice this on day one — a light cooling lift as it absorbs. Sixty seconds, no residue. The habit takes about four days to become automatic.
A scalp that feels looked after
Better conditioned, less tight, calmer. Small, and the first real sign that something is being actively done.
The drain starts getting boring
The one you’re waiting for, and it usually arrives before any new growth does. Less in your hands after washing. Less on the pillow. That’s the moment most women say they exhaled.
Baby hairs at the hairline
Short, wispy, standing straight up, impossible to style. Check your hairline and temples in daylight — this is the visible proof, and it’s the photo everyone sends us.
Full disclosure
Ten actives. Every one printed on the bottle.
No proprietary blend, no “complex” hiding the list. Here it is, with what each one does.
Five biomimetic peptides
sh-Polypeptide-1 · -9 · -11 · sh-Oligopeptide-2 · -10
Lab-made copies of the signalling proteins your body uses to tell follicles when to grow. The five in Signal 5.
Rosemary
Rosmarinus officinalis
The most-studied botanical in this category, and the one with the trial behind it. Supports a healthy scalp environment.
Arginine
L-Arginine
An amino acid supporting scalp microcirculation — blood flow to where the follicle sits.
Scutellaria baicalensis
Baikal skullcap root
Antioxidant and soothing botanical. Keeps a sensitive scalp calm and comfortable.
Saw Palmetto
Serenoa repens
A botanical extract long used in scalp formulas to support ongoing density.
Eucalyptus
Eucalyptus globulus
Scalp comfort and the light, clean finish. This is the cooling lift you feel on application.
On the rosemary research: a randomised controlled trial of 100 patients (Panahi Y et al., Skinmed, 2015) compared rosemary oil against minoxidil 2%. At six months both groups showed significant increases in hair count with no significant difference between them, and scalp itching was significantly more frequent in the minoxidil group. That was minoxidil 2%, at six months. Research on the ingredient, not on Signal 5.
Drug-freeNo minoxidil, no prescription
Hormone-freeNothing that acts on your hormones
Not ingestedStays on your scalp
Colour-safeGoes on the scalp, not the lengths
The routine
Sixty seconds. Once a day.
Short enough to actually do while the baby naps.
-
1
Part dry hair
Dry or towel-dried. Part where you normally do, then make a second and third parting either side.
-
2
Apply along the partings
One full dropper, in small amounts along each parting and around the hairline. On scalp, not on hair.
-
3
Ten seconds, then forget it
Fingertips, circular pressure, ten seconds. Don’t rinse. Style as normal or go straight to bed.
Answers to your questions
Is there anything in it I can’t use while nursing?
Signal 5 contains no drugs, no minoxidil and no hormones. Nothing is ingested, and it’s applied only to the scalp. Every one of the ten actives is printed on the bottle rather than hidden inside a proprietary blend — which means you can take the list straight to your doctor, midwife or lactation consultant. We publish it in full for exactly that reason.
Could it get on my baby’s skin?
Apply to the scalp and massage until absorbed — it’s designed to sink in rather than sit on the surface. Most mothers apply in the evening, which gives it hours before any morning cuddles. As with any topical, keep it away from your baby’s skin and mouth and store it out of reach.
How long until I see something?
Eight to twelve weeks for most women. The first sign is usually shedding less rather than growing more — that tends to show up around weeks four to eight. Baby hairs along the hairline typically follow in the eight-to-twelve week window.
Will it make my hair greasy? I barely have time to wash it.
It’s a lightweight scalp serum, not an oil. One dropper, ten seconds of massage, done. It absorbs rather than sitting on the surface, and plenty of women apply at night and forget about it entirely.
Is it colour-safe? Does it smell?
Colour-safe — it goes on the scalp, not the lengths. The scent is light and herbal from the rosemary and eucalyptus, and it fades within minutes.
How do I cancel or pause?
Log in, two clicks, done. You can also pause or push your next delivery back a month if you’re still working through bottles. Or buy one-time and never hear from us about billing.
Do peptides actually do anything applied topically?
Peptides are how your body signals follicles in the first place — that part is basic hair biology, not marketing. Biomimetic peptides are lab-made copies of those signalling proteins, and applying them at the scalp puts them where the follicles are rather than asking a capsule to route them through your entire system first. That directness is the whole argument for a topical over a pill.
Can I use it alongside my other products?
Yes — shampoo, conditioner, heat protectant and styling products all sit fine alongside it. It goes onto a dry scalp and stays there. If you use a prescription topical, ask the doctor who prescribed it about spacing.
What if it doesn’t work for me?
Use all three bottles as directed. If at ninety days you can’t see a difference, send us a photo of the empties and we’ll refund you in full.
Should I get my bloods checked?
Worth doing regardless — ask for a thyroid panel and a ferritin level rather than just “iron.” Both are common postpartum, both are straightforward to correct, and knowing either way puts you back in control. Use the serum alongside; there’s no conflict.
Choose your supply
Results show at eight to twelve weeks.
Which is why the 90-day supply is the one most women choose — and why it works out at $50 a bottle.
Subscribe & save
Pause, skip or cancel in two clicks.
- Free US shipping over $100
- Ships from the US
- 90-day promise
The 90-day promise. Use all three bottles as directed and if you can’t see a difference, send us a photo of the empties and we’ll refund you in full.