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Hair Porosity Explained: Why Your Hair Absorbs Nothing

If your hair: feels dry even after conditioning gets frizzy immediately absorbs oil too fast—or not at all stays wet forever never seems hydrated …the problem may not be your products. It may be your hair porosity. In the Grit & Glow Lab, we see porosity as one of the most overlooked reasons people struggle with dryness, breakage, buildup, and “unmanageable” hair. Because healthy hair isn’t only about what you apply. It’s about whether your strands can actually absorb and retain moisture properly. This guide explains what hair porosity means, how to identify your porosity type, and how to build a smarter hair routine that actually works for your hair structure. What Is Hair Porosity? Hair porosity refers to your hair’s ability to absorb and retain moisture. Your hair strand is protected by a cuticle layer made of overlapping scales. When the cuticle is: tightly closed → moisture struggles to enter balanced → hydration stays stable raised or damaged → moisture escapes too quickly 👉...
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The Hair Growth Cycle Explained: Why Your Hair Stops Growing (Grit & Glow Follicle Report)


 

If you’ve ever wondered why your hair suddenly feels thinner, sheds more than usual, or simply refuses to grow past a certain length, the answer often comes down to one thing:

The hair growth cycle.

In the Grit & Glow Lab, we don’t look at hair as “dead strands.”

We look at it as a living biological system operating in phases of growth, rest, release, and regeneration.

And when one phase becomes disrupted by stress, nutrient depletion, inflammation, hormones, or scalp dysfunction…

your hair changes.

This guide breaks down the complete hair growth cycle, why hair stops growing, and how to support longer, healthier growth phases naturally.

What Is the Hair Growth Cycle? (Quick Answer)

The hair growth cycle is the repeating biological process that controls how hair grows, rests, sheds, and regrows.

It consists of four phases:

  1. Anagen → Growth phase
  2. Catagen → Transition phase
  3. Telogen → Resting phase
  4. Exogen → Shedding phase

👉 Healthy hair growth depends on spending enough time in the anagen (growth) phase.

Why Understanding the Hair Growth Cycle Matters

Most people think hair grows continuously.

It doesn’t.

Every strand on your scalp is on its own independent timeline.

That means:

  • some hairs are growing
  • some are resting
  • some are preparing to shed

At all times.

👉 Hair problems begin when too many follicles shift out of growth mode too early.

Phase 1: Anagen (The Growth Phase)

This is the most important stage of the hair growth cycle.

The anagen phase is when:

  • follicles actively produce hair
  • keratin is built
  • strands lengthen continuously

How Long Does the Anagen Phase Last?

Typically:

  • 2 to 7 years

The longer this phase lasts:
👉 the longer and thicker your hair can grow.

What Supports the Growth Phase?

Healthy anagen activity depends on:

  • protein intake
  • iron levels
  • vitamin D
  • scalp circulation
  • hormonal balance
  • stress regulation

👉 This phase is extremely energy-demanding for the body.

Phase 2: Catagen (The Transition Phase)

This is the shortest stage.

It lasts:

  • around 2–3 weeks

During catagen:

  • hair growth slows
  • the follicle shrinks
  • the strand disconnects from blood supply

👉 Think of this as the follicle “powering down.”

Phase 3: Telogen (The Resting Phase)

During telogen:

  • the hair remains in place
  • but active growth stops

This phase lasts:

  • approximately 2–4 months

At any time:

  • about 10–15% of scalp hairs are in telogen

👉 Increased stress or illness can push too many hairs into this phase at once.

Phase 4: Exogen (The Shedding Phase)

This is when old hairs release and fall out naturally.

Daily shedding is normal.

Typical range:

  • 50–100 hairs per day

👉 Shedding only becomes a problem when regrowth slows or stops.

Why Hair Stops Growing

Hair usually doesn’t “stop” randomly.

It stops because the growth cycle becomes disrupted.

1. Chronic Stress

Stress increases cortisol.

High cortisol can:

  • shorten the anagen phase
  • increase shedding
  • push follicles into resting mode

👉 Stress-related hair loss is extremely common.

2. Nutrient Deficiencies

Hair follicles require:

  • iron
  • zinc
  • protein
  • biotin
  • vitamin D

Without enough nutrients:

  • follicles conserve energy
  • growth slows
  • shedding increases

👉 Hair is often the first place the body cuts resources.

3. Hormonal Changes

Hormones strongly influence the hair cycle.

Common triggers:

  • postpartum changes
  • thyroid imbalance
  • androgen shifts
  • menopause

👉 Hormonal disruption often shortens growth duration.

4. Scalp Inflammation

An unhealthy scalp environment affects follicle function.

Causes include:

  • buildup
  • dandruff
  • irritation
  • excess oil
  • harsh products

👉 Healthy follicles need a healthy scalp environment.

5. Heat & Mechanical Damage

Even if follicles are growing normally…

damage can make hair appear “stuck.”

This includes:

  • heat styling
  • bleaching
  • tight hairstyles
  • aggressive brushing

👉 Breakage can mimic slow growth.

💎 The Grit & Glow Insight: Most Hair “Growth Problems” Are Actually Growth Phase Problems

The goal is not forcing hair to grow faster.

The goal is:
👉 keeping follicles in the growth phase longer.

That’s where thickness, density, and visible length come from.



How to Support the Hair Growth Cycle

1. Improve Nutrient Intake

Focus on:

  • protein
  • iron
  • omega-3s
  • zinc
  • vitamin D

💎 Lab Pick: Viviscal Professional Hair Growth Supplement

Why it stands out:

  • Contains Biotin + Zinc + Vitamin C
  • Supports keratin production
  • Designed to nourish thinning hair
  • Includes AminoMar® marine complex
  • Clinically studied for hair density support

👉 Ideal for supporting the anagen (growth) phase.

💎 Alternative Lab Pick: Nutrafol Women Hair Growth Supplement

Why it works:

  • Targets stress-related hair shedding
  • Includes adaptogens + collagen support
  • Focuses on hormonal + inflammatory triggers
  • Popular for thinning hair support

👉 Best for stress and hormone-related hair disruption.

2. Reduce Scalp Stress

Support circulation with:

  • scalp massage
  • gentle cleansing
  • reduced heat exposure

3. Sleep & Recovery

Hair repair happens during recovery states.

Poor sleep often worsens:

  • shedding
  • inflammation
  • hormone imbalance

4. Manage Stress

This matters more than most people realize.

Lower stress helps:

  • prolong anagen phase
  • reduce telogen shedding
  • improve scalp health

How Long Does Hair Growth Take?

Hair grows:

  • around half an inch per month

Visible improvements often take:

  • 3–4 months minimum

👉 Hair biology moves slowly.

Consistency matters more than intensity.

Signs Your Hair Growth Cycle Is Improving

Positive signs include:

  • less shedding
  • stronger texture
  • baby hairs around hairline
  • thicker ponytail density
  • improved scalp comfort

FAQs: Hair Growth Cycle

What are the stages of the hair growth cycle?

The four stages are anagen, catagen, telogen, and exogen.

Why does hair stop growing?

Stress, nutrient deficiencies, hormonal changes, scalp inflammation, and damage can disrupt the growth phase.

How long is the hair growth phase?

The anagen phase typically lasts between 2 and 7 years.

Can the hair growth cycle recover?

Yes. With proper nutrition, scalp support, and stress management, follicles can return to healthier growth patterns.

Final Thought

Your hair is constantly listening to the state of your body.

When your system feels stressed, inflamed, depleted, or overwhelmed…

the growth cycle changes.

And when your body finally feels supported again—

your follicles respond.

Because healthy hair isn’t just about products.

It’s about creating the conditions where growth feels safe again.



👉Rosemary Oil for Hair Growth


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