A Broth & Co guide to melanocytes, melanin, stem cells, the hair follicle, healthy ageing and the biology behind natural hair colour.

When we look at someone’s hair, one of the first things we notice is its colour: blonde, brown, black, red, silver, grey or white. Hair colour can feel like a simple inherited trait, but the biology behind it is surprisingly elegant.

Every strand of hair begins its life completely colourless. Its colour is created deep inside the hair follicle while the strand is still forming beneath the surface of the scalp. Long before hair becomes visible, specialised pigment-producing cells are already working beside the cells that build the hair shaft.

Hair colour is not painted onto the outside of hair. It is built into the strand as it grows. That small shift in understanding turns hair pigmentation from a cosmetic feature into a living biological process involving cells, stem cells, tissue signals and healthy ageing.

 

Hair Colour Begins Inside the Follicle

The visible hair shaft above the scalp is no longer living tissue. By the time you see it, its colour has already been determined. The real work happened earlier, deep within the follicle.

The hair follicle is a miniature biological organ. It contains hair matrix cells that build the growing hair shaft, stem cells that help renew the follicle, a dermal papilla that coordinates signalling, blood vessels that deliver nutrients and connective tissue that supports the structure around it.

Pigment-producing melanocytes sit within this organised environment. They work during the active growth phase of the hair cycle, producing pigment and transferring it into the newly forming hair shaft.

For the foundation of this system, see Hair–Scalp Biology Explained: Why Healthy Hair Starts With a Healthy Scalp, The Hair Follicle Explained and The Hair Growth Cycle Explained.

 

Meet the Melanocyte

Melanocytes are specialised cells responsible for producing melanin, the pigment that gives colour to hair, skin, eyebrows, eyelashes and the iris of the eye. In the hair follicle, melanocytes do something very precise: they manufacture pigment and deliver it into the hair while it is being formed.

This makes melanocytes different from cosmetic colour. Dye sits on or within the visible hair shaft after it has grown. Natural hair colour is created before the strand emerges, through biological activity inside living tissue.

Melanocytes also play a central role in skin colour, which is explored in Melanocytes Explained: The Cells That Give Skin Its Colour.

What Is Melanin?

Melanin is a naturally occurring biological pigment. In hair, it is packaged into tiny structures called melanosomes. These melanosomes are transferred from melanocytes into developing hair cells, where the pigment becomes part of the growing hair shaft.

Once that section of hair has emerged from the scalp, the pigment is fixed within the strand. This is why natural colour reflects what happened during formation, not what the visible hair can do afterwards.

Two Main Pigments Create Many Natural Colours

The diversity of natural hair colour comes mainly from different amounts and combinations of two forms of melanin: eumelanin and pheomelanin.

 

This is the “I never knew that” part for many people: hair colour is not one pigment on a sliding scale. It is a biological recipe created by specialised cells, with the type, amount and distribution of melanin all contributing to the final shade.

Genetics strongly influences this recipe. Genes help determine how melanocytes produce and distribute eumelanin and pheomelanin. But genes do not work in isolation. The follicle environment, stem cell activity, signalling and healthy ageing all influence how pigmentation is maintained over time.

Hair Colour Is a Team Effort

Melanocytes produce pigment, but they do not build the hair. That job belongs to hair matrix cells. During the active growth phase, hair matrix cells divide rapidly to form the developing hair shaft, while melanocytes supply pigment at the same time.

If hair matrix cells built hair without pigment, the strand would emerge colourless. If melanocytes produced pigment without developing hair cells to receive it, there would be nowhere for the colour to go. Natural hair colour depends on timing and teamwork.

The dermal papilla at the base of the follicle acts as a communication centre. It exchanges signals with hair matrix cells, melanocytes, stem cells, blood vessels and surrounding connective tissue. Pigmentation develops inside this coordinated network rather than from one isolated cell type.

This network connects with The Dermal Papilla Explained: The Hair Follicle's Command Centre, Hair Follicle Stem Cells Explained: The Remarkable Cells That Renew Hair Throughout Life and Cellular Communication Explained: How Trillions of Cells Work Together Every Second.

Stem Cells Help Keep the Pigment System Going

One of the most fascinating areas of hair pigmentation research involves melanocyte stem cells. These specialised stem cells help replenish pigment-producing melanocytes across repeated hair growth cycles.

A hair follicle is not permanently active. It moves through growth, transition, resting and shedding phases. When a new growth phase begins, the follicle needs to generate both the new hair shaft and the pigment-producing cells that colour it.

Melanocyte stem cells act like a reserve population. They help maintain the pigment system over time. Researchers continue to investigate how these cells behave throughout life and how changes in this stem-cell population may contribute to the gradual reduction in pigment seen with age.

 

The Matrix Around the Follicle Matters Too

Hair pigmentation does not happen in empty space. The follicle is surrounded by connective tissue and the extracellular matrix. This matrix provides structural support, helps organise cells, stores signalling molecules and contributes to the environment in which follicle cells communicate.

This matters because skin and hair are not separate worlds. The scalp is skin. The follicle sits inside that living skin environment, supported by blood supply, immune cells, connective tissue, fibroblasts and matrix biology.

For this broader framework, see Extracellular Matrix Explained: The Hidden Biological Framework That Holds Your Skin Together, Fibroblasts Explained: The Cells That Build Your Skin's Collagen, Elastin & Extracellular Matrix and Matrix Biology Explained: How the Extracellular Matrix Shapes Health.

Why Hair Colour Naturally Changes Throughout Life

Natural changes in hair colour are one of the most visible signs that living tissues change across the lifespan. For some people, silver hairs appear in their twenties. For others, much later. Some hair gradually lightens; some becomes salt-and-pepper; some eventually appears white.

The key point is that the visible hair shaft is reflecting biology inside the follicle. As new hairs are produced, the amount and type of pigment incorporated into each new strand may change. Hair colour changes because the pigment-producing system changes.

Researchers continue to investigate how genetics, melanocyte stem cells, pigment-producing melanocytes, cellular communication, oxidative balance and the local follicle environment influence this process. It is not one simple switch. It is a complex biological network changing over time.

This connects naturally with Why Skin Ages: The Biology of Skin Ageing Explained and Oxidative Stress Explained: What It Is and Why Balance Matters for Healthy Cells.

Oxidative Balance and Pigment Biology

Oxidative balance is often discussed in relation to hair colour, especially greying. Normal metabolism naturally produces reactive molecules, and the body uses antioxidant systems to manage them. These reactive molecules are not simply bad; in appropriate amounts, they also act as signals.

Researchers are investigating how oxidative processes interact with melanocytes, stem cells and the hair follicle environment as we age. This is an active area of science, but it should not be reduced to a simple claim that one food, supplement or antioxidant prevents grey hair.

A more accurate and useful message is that pigment biology depends on cellular resilience. Cells need energy, nutrients, communication, repair systems and a supportive tissue environment. Hair colour is one visible outcome of deeper biological organisation.

For more on tissue-level communication, see Cellular Crosstalk Explained: How Cells Communicate to Build and Maintain Healthy Tissues.

Nutrition Supports the Living Tissues Beneath the Colour

Hair pigmentation is created by living cells, and living cells rely on nutrients delivered through the bloodstream. Nutrition does not act like a hair dye, and it should not be framed as a way to change your genetic hair colour. Its role is more foundational: supporting the normal physiological function of the scalp, follicle and cells involved in hair growth and pigmentation.

 

For practical nutrition context, see Nutrition for Hair & Scalp Health, Protein Throughout Life: Why Your Protein Needs Change With Age and Amino Acids The Building Blocks.

Where Healthy Glow Fits

Healthy Glow is best understood as part of a beauty-from-within routine, not as a hair-colour product. Collagen peptides can provide collagen-associated amino acids within a broader nutrition pattern that supports skin, connective tissue and healthy ageing. Hair pigmentation itself is a specialised cellular process influenced by genetics, melanocytes, stem cells and the follicle environment.

For more, see BC Beauty Healthy Glow: The Science of Beauty, Recovery, Mobility & Healthy Ageing or view Healthy Glow.

A Better Way to Think About Hair Colour

Much of the public conversation asks one question: why does hair go grey? Modern biology invites a better question: how does the body create natural hair colour in the first place?

That question changes everything. Instead of seeing pigmentation only as something that disappears, we see the remarkable biology required to produce colour at all. Melanocytes must make pigment. Melanosomes must package it. Hair matrix cells must receive it. Stem cells must replenish the system. The dermal papilla must coordinate signals. The follicle must enter the right growth phase.

Hair colour becomes a story of cellular timing, communication and renewal. It is one of the most visible examples of the body’s hidden biology.

This is why hair pigmentation sits within the broader beauty and skin biology library, alongside Skin Is a Living Organ: Why Skin Cells Need Both Building Blocks and Biological Signals and Beauty Biology Explained: Why Healthy Skin Starts From Within.

Frequently Asked Questions

What gives hair its natural colour?

Hair gets its natural colour from melanin, a pigment produced by specialised cells called melanocytes. Pigment is transferred into the developing hair shaft while it is forming inside the follicle.

What are melanocytes?

Melanocytes are specialised pigment-producing cells found in the skin and hair follicle. In hair, they produce melanin and transfer it into developing hair cells.

What is the difference between eumelanin and pheomelanin?

Eumelanin contributes brown and black tones, while pheomelanin contributes golden, copper and red tones. Natural hair colour reflects different combinations of these pigments.

Does hair turn grey after it grows?

No. The visible hair shaft does not turn grey after it has grown. New hairs may emerge grey, silver or white when less pigment is incorporated during formation inside the follicle.

Why does hair colour change with age?

Researchers continue to investigate how genetics, melanocyte stem cells, pigment-producing cells, oxidative balance and follicle signalling influence changes in hair pigmentation across life.

Can nutrition stop grey hair?

Nutrition supports the normal function of living tissues, but it should not be described as a guaranteed way to stop grey hair. Hair pigmentation is influenced by many interacting factors, including genetics and healthy ageing.

Is hair pigmentation connected to skin biology?

Yes. Hair follicles sit within the skin and are influenced by the scalp environment, connective tissue, blood supply, immune cells and cellular communication.

Is Healthy Glow a hair colour product?

No. Healthy Glow is not positioned as a hair colour product. It can fit within a broader beauty-from-within routine, while hair pigmentation itself depends on melanocytes, stem cells and follicle biology.

Summary

Hair pigmentation is far more than a cosmetic characteristic. It is the result of living cells working together inside the hair follicle before the strand emerges from the scalp.

Melanocytes produce melanin. Melanosomes transfer pigment. Hair matrix cells build the strand. Stem cells help replenish key cell populations. The dermal papilla coordinates signalling. The extracellular matrix and surrounding scalp environment support the tissue structure in which all of this happens.

Natural hair colour is one of the body’s quiet marvels: a visible expression of cellular communication, tissue renewal and healthy biology beneath the surface.