What Is Melanin? The Science Behind the Pigment Everyone Has

Everyone Has Melanin. Most People Know Very Little About It.

Melanin is one of the most widespread and scientifically fascinating pigments in the natural world. It colours human skin, hair, and eyes. It's found in the feathers of birds, the ink of squid, the skin of fungi, and the seeds of plants. It has been present in living organisms for hundreds of millions of years.

And yet most people — regardless of their skin tone — know almost nothing about it.

MELA exists to change that. Not as a political statement. Not as a campaign. Simply as an invitation to know more about something that is part of every single human being on the planet.

What Melanin Actually Is

Melanin is a naturally occurring biological pigment produced by specialised cells called melanocytes. These cells are found in the skin, hair follicles, eyes, and inner ear. Every human being, regardless of skin tone, has roughly the same number of melanocytes — approximately 1,000 to 2,000 per square millimetre of skin.

What differs between people is not the number of melanocytes, but how active they are and how much melanin they produce.

There are three main types of melanin in the human body:

• Eumelanin — the most common type, responsible for brown and black pigmentation in skin and hair. Higher concentrations produce darker tones; lower concentrations produce lighter ones.
• Pheomelanin — responsible for red and yellow pigmentation. Found in higher concentrations in people with red hair and fair skin.
• Neuromelanin — found in the brain, particularly in regions associated with motor control. Its exact function is still being studied, but its absence is associated with certain neurological conditions.

The variation in human skin tone — the entire spectrum from the palest to the deepest — is produced by differences in the ratio and concentration of these three pigments. It is, in the most literal sense, a matter of chemistry.

🆕 Download the Free Skin & Hair Colours Booklet

The Biology of Skin Tone

Human skin colour is one of the most studied traits in evolutionary biology. The current scientific consensus, supported by decades of genetic research, is that variation in skin tone evolved primarily in response to UV radiation — specifically, the need to balance two competing biological demands.

On one hand, UV radiation from the sun breaks down folate (vitamin B9) in the body. Folate is essential for DNA synthesis and repair, and critically important during pregnancy for foetal neural development. Darker skin, with higher concentrations of eumelanin, provides greater protection against UV-induced folate depletion.

On the other hand, UV radiation is also necessary for the skin to synthesise vitamin D, which is essential for bone health, immune function, and a range of other biological processes. In lower-UV environments — further from the equator, with less direct sunlight — lighter skin allows more UV penetration and therefore more vitamin D synthesis.

The result is a global gradient: populations whose ancestors lived closer to the equator, where UV radiation is most intense, tend to have higher concentrations of eumelanin and darker skin. Populations whose ancestors lived further from the equator tend to have lower concentrations and lighter skin.

This is not a hierarchy. It is adaptation. Every point on the spectrum is a biological solution to a specific environmental challenge — and every point is equally sophisticated.

What Melanin Does (Beyond Colour)

Melanin's role in the body goes well beyond pigmentation. Research over the past two decades has revealed a range of biological functions that make it one of the most remarkable molecules in nature.

UV protection. Eumelanin absorbs UV radiation and dissipates it as heat, protecting DNA in skin cells from damage. This is why higher concentrations of melanin are associated with lower rates of UV-induced skin cancer. A 2020 review in Photochemistry and Photobiology described melanin as "one of the most efficient natural photoprotective agents known."

Antioxidant activity. Melanin is a powerful antioxidant, capable of neutralising free radicals — unstable molecules that damage cells and contribute to ageing and disease. Research published in the Journal of Investigative Dermatology has shown that melanin's antioxidant capacity is significantly higher than that of many synthetic antioxidants.

Heavy metal binding. Melanin has a strong affinity for heavy metals, including lead, mercury, and cadmium. It binds these metals and prevents them from causing cellular damage — a function that researchers are actively exploring for potential medical applications.

Thermoregulation. By absorbing light and converting it to heat, melanin plays a role in the body's thermal regulation — a function that is particularly relevant in high-UV, high-temperature environments.

Neurological function. Neuromelanin, found in the brain, is thought to play a protective role against oxidative stress in neurons. Its depletion is associated with Parkinson's disease, and understanding its function is an active area of neuroscience research.

Melanin in the Natural World

One of the most striking things about melanin is how universal it is — not just across human populations, but across the entire living world.

The black ink that a squid releases as a defence mechanism is melanin. The dark colouring of a raven's feathers is melanin. The brown of a mushroom cap, the dark spots on a banana, the black of a cat's fur — all melanin, or melanin-related compounds.

Melanin has been found in fossils dating back over 300 million years, preserved in the feathers of ancient birds and the skin of prehistoric reptiles. It is one of the most stable biological molecules known — resistant to degradation, chemically robust, and extraordinarily durable.

In 2012, researchers at Yale University extracted melanin from a 160-million-year-old squid fossil and found it to be chemically almost identical to the melanin in modern squid ink. Three hundred million years of evolution, and the molecule barely changed. That is not a coincidence. That is a molecule that works.

Why MELA Exists

MELA is not a campaign about any particular group of people. It is an invitation — to everyone — to know more about one of the most fascinating, most universal, and most underappreciated molecules in the natural world.

Every human being produces melanin. Every human being's appearance — their skin tone, their hair colour, their eye colour — is shaped by it. Understanding melanin is, in a very real sense, understanding something fundamental about what it means to be human.

The Embrace Melanin Globe — the symbol at the heart of the MELA range — reflects this universality. Melanin is not regional. It is not niche. It is global, it is ancient, and it is in every one of us.

Wearing MELA is simply a way of saying: I know what this is. I find it remarkable. And I think more people should.

Start Here: Free Download

Want to learn more about the science of skin and hair colours? We've put together a free illustrated booklet that breaks it all down — accessible, visual, and genuinely fascinating.

Download the Skin & Hair Colours Booklet — Free

Wear the Science: The MELA Range

Every piece in the MELA range carries the Embrace Melanin Globe — a quiet, grounded symbol that says: I know what this is, and I think it's remarkable.

Explore the full MELA range at Giddymoose — everyday wear and homewares celebrating one of nature's most remarkable pigments.