Phase Theory Beauty Co. · Scalp Science

The Science of
Hair Growth

Healthy hair begins at the scalp. Each moves through a natural cycle of growth, transition and rest — and understanding it shows what good hair care can genuinely do: care for the scalp, condition the hair, and protect the length you already have.

The Growth Cycle

Three phases.
One continuous cycle.

At any given moment, every hair on your head is in one of these three phases — each cycling on its own schedule. That's why you don't lose all your hair at once, and why consistent care matters every day.

Follicle State

— Scalp SurfaceDermal PapillaBlood Supply

2–7 Years

Typical duration

85%

of follicles at any time

01

Anagen Phase

The Growth Phase

What's Happening

Deep in each , cells are actively dividing and building the hair fiber — this is where all new length comes from.

Typical Duration

Typically 2–7 years. How long each follicle stays in this phase is largely set by genetics — it's why everyone's personal maximum length is different.

What You May Notice

Steady new length appearing over the months, at a pace set by your own biology.

Hair-Care Perspective

Cosmetic products can't speed up this biological growth — but caring for the scalp and conditioning the hair help you keep the length you're growing. Gentle cleansing removes buildup, while moisture protects the fiber from the dryness that leads to breakage.

Ingredients That Support Hair & Scalp Care

Rosemary Extract

Helps condition the scalp and add healthy shine

Castor Oil

Helps hair appear fuller and glossier

Biotin

Part of our vitamin blend for stronger-feeling hair

Peppermint

Provides a refreshing scalp sensation

← Cycle repeats

Growth Support · The Honest Science

Growth isn't the same
as length retention.

Hair grows from the beneath the scalp. But the length you see depends on more than what happens at the root.

As hair gets longer, the fiber is exposed to washing, styling, friction, heat, manipulation and environmental stress. When the hair shaft breaks faster than new length can be retained, it can feel like your hair "isn't growing" — even though growth is still occurring at the follicle.

That's why healthy hair care has two jobs: care for the scalp and protect the length you already have.

Growth

SCALP SURFACENEW LENGTHNEW LENGTH FORMS AT THE ROOT

Happens at the follicle.

New length is produced beneath the scalp, at a rate set by your biology.

Length Retention

INTACT · LENGTH KEPTBROKEN · LENGTH LOST

Depends on protecting the hair fiber from unnecessary breakage.

Moisture, conditioning and gentle handling help you keep the length you grow.

Growing hair≠Keeping length

Hair can be growing at the root while breakage keeps the new length from showing — that's why protection matters as much as growth.

Growth support is about caring for the scalp and protecting the hair fiber while the body's natural hair-growth cycle does its work.

Explore growth-support ingredients

Reading Your Hair

Shedding or breakage?
They're not the same.

Finding strands doesn't always mean the same thing. Knowing the difference tells you what your hair actually needs.

SheddingWHOLE STRAND · ROOT END INTACT

The entire hair strand releases from the follicle as part of the natural hair cycle.

Whole strand · root end intact

BreakageBREAKS ALONG THE FIBERNO ROOT END

The hair fiber breaks somewhere along the strand rather than releasing from the follicle.

Shorter broken piece · no root end

Healthy hair care cannot eliminate the normal hair cycle, but moisture, conditioning, gentle handling and reduced friction can help protect the hair fiber from unnecessary breakage.

Explore the Diagram

Select a structure to learn more.

EpidermisDermisHypodermisNutrient & oxygen delivery to living follicular tissue

The follicle, dermal papilla and surrounding blood supply are related biological structures.

Scalp Biology

Where hair growth
begins.

Hair is produced by the — a tiny structure rooted beneath the scalp. Hair care can't change how fast your body naturally grows hair, but it plays a meaningful role in what you can influence: keeping the scalp clean, balanced and comfortable, and protecting each strand from unnecessary breakage so you keep the length you grow.

0.3mm

Average daily growth

On average, scalp hair grows about 0.3mm a day — roughly half an inch a month. Individual growth rate varies and is influenced by biological factors like genetics, age, hormones and nutrition. Cosmetic products don't change this intrinsic rate — their role is caring for the scalp and protecting the hair you've grown.

100K

Follicles per scalp

Each one is an independent structure, cycling at its own pace. At any given moment, about 85% are in the active growth phase.

7yr

Typical growth-phase ceiling

How long each follicle keeps growing is largely set by genetics — it's why maximum length is different for everyone. Hair care can't extend this biological ceiling, but protecting the fiber helps you keep the length you grow.

Ingredient Support

How ingredients support
healthy-looking hair.

Beyond the ingredient list: learn how key ingredients help support moisture, conditioning, strength, scalp care and length retention.

◈

Scalp Care & Shine

Rosemary Extract

A time-honored botanical that helps condition the scalp and leaves hair looking glossy and feeling fresh.

⬡

Strength & Condition

Biotin

Part of our vitamin blends — alongside the proteins and that make up much of the hair fiber — helping hair feel stronger and look its best.

✦

Strength & Gloss

Horsetail Extract

A mineral-rich botanical traditionally used to help hair feel stronger and reflect a natural, healthy shine.

●

Moisture & Softness

Avocado Oil

A rich emollient that helps hair hold onto moisture, supporting softness, elasticity and reduced breakage.

◉

Scalp Comfort

Seaweed Extract

Marine botanicals that help the scalp feel balanced, hydrated and comfortable — the foundation of healthy-looking hair.

Continue Your Education

From hair science
to formula science.

Now that you know more about how hair grows, explore the ingredients we use to care for the scalp, condition the hair and help protect the fiber from breakage.

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Phase Theory Beauty Co.™

Baby Hair® · Beards & Bourbon™ · Velvet Diamonds · Phase Theory Skincare · Phase Theory Wellness

The science of beautiful hair.

📞 Phone

(713) 254-0732

📍 Address

15534 W Hardy Rd Suite 175
Houston, Texas 77060

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Professional Affiliations

Members of the Society of Cosmetic Chemists — committed to scientific excellence in formulation.

Dr. Bre Hayward | 2027 Chair-Elect, Society of Cosmetic Chemists — Southeast Chapter

Results Disclaimer: Individual results may vary. Hair and scalp conditions differ by person. Product outcomes are not guaranteed.

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. Phase Theory Beauty Co.™ products are cosmetic formulations and are not intended to diagnose, treat, cure, or prevent any disease or medical condition.

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