How to Grow Healthy Hair: What Actually Works (and What Doesn't)

Want your hair to grow faster? Before you buy another hair growth product, there's something you should understand.

I can't tell you how many times I've heard someone say, "My hair just doesn't grow."

And I get it.

When you're trying to grow your hair longer, it can feel like it's taking forever. Especially when you're watching someone else's hair seemingly grow inches overnight.

But here's something I want you to think about.

Is your hair actually growing slowly? Is it shedding more than usual? Or is it growing perfectly well but breaking before you notice the length?

Because those are three very different situations.

And understanding the difference can save you a lot of time, frustration, and money.

First, How Fast Does Hair Actually Grow?

On average, scalp hair grows approximately 1 centimetre per month, although growth rates vary between individuals.

Your genetics, age, hormones, nutritional status, overall health, and the activity of your hair follicles can all influence your growth pattern.

And contrary to what some product advertisements suggest, there's no shampoo, oil, or supplement that can reliably make everyone's hair grow twice as fast.

I know. Not nearly as exciting as the marketing makes it sound.

But understanding how hair grows gives you a much better starting point than chasing promises on a bottle.

Hair growth happens within the follicle, beneath the scalp.

The visible hair fibre is the result of that biological activity.

Once the hair emerges from the scalp, it no longer contains living cells capable of repairing themselves.

This is why I like to separate hair care into two important areas:

Supporting the follicle: Understanding the biological factors that influence hair production, growth cycles, and shedding.

Protecting the fibre: Reducing damage and breakage so you can retain the hair you've already grown.

You need to consider both if your goal is longer, healthier-looking hair.

1. Nutrition Matters, But More Isn't Always Better

Your hair follicles are metabolically active structures. Producing hair requires energy, amino acids, and an adequate supply of essential nutrients.

Protein, iron, zinc, and certain vitamins all play roles in normal hair growth and follicular function.

If you're deficient in a nutrient that's important for hair production, correcting that deficiency may help restore normal growth.

But that doesn't mean taking extra supplements will make your hair grow faster if your nutritional status is already adequate.

And in some cases, excessive supplementation can actually contribute to hair loss or other health concerns.

For example, too much selenium or vitamin A can be associated with hair shedding.

So before investing in a cabinet full of hair vitamins, it's worth considering whether you actually need them.

My advice? Start with nourishment, not supplementation.

Aim for a varied diet that provides adequate protein, essential fats, vitamins, and minerals.

And if you suspect a nutritional deficiency, appropriate medical assessment and testing can help determine what needs attention.

2. Scalp Massage: Helpful, But Let's Be Clear About the Evidence

Scalp massage is often promoted as a way to stimulate blood circulation and speed up hair growth.

And while massage can be relaxing and may temporarily increase local blood flow, the evidence that it meaningfully improves hair growth is limited.

A few small studies have explored its potential effects, but we don't have strong evidence that daily scalp massage reliably increases hair growth rates.

That doesn't mean you can't enjoy it.

If gentle scalp massage helps you relax or makes your scalp-care routine more enjoyable, wonderful.

Just don't mistake increased circulation for guaranteed follicular stimulation.

And if your scalp is inflamed, painful, irritated, or experiencing certain types of hair loss, aggressive massage may not be appropriate.

Sometimes the best thing you can do for your scalp is leave it alone until you understand what's happening.

3. Be Careful With Products That Promise Hair Growth

Biotin. Collagen. Keratin. Castor oil. Rosemary oil.

The list of ingredients marketed for hair growth seems to get longer every year.

But here's where we need to separate the marketing from the science.

Biotin: An essential vitamin involved in normal metabolism. Supplementation can be helpful in cases of deficiency, but evidence supporting extra biotin for hair growth in people without a deficiency is limited.

Collagen: Provides amino acids that the body can use, but there's insufficient high-quality evidence that collagen supplements specifically accelerate scalp hair growth.

Keratin: Keratin-containing products may improve the cosmetic properties of the hair fibre, depending on their formulation. That doesn't mean they stimulate follicles to produce hair faster.

Castor oil: Can help lubricate and condition the hair fibre, but there is no convincing clinical evidence that it stimulates hair growth.

Rosemary oil: Some preliminary research has explored its potential role in androgenetic alopecia, but the evidence remains limited. It shouldn't be considered a proven replacement for established medical treatments.

And here's something else worth remembering.

Just because an ingredient is natural doesn't automatically mean it's effective or suitable for everyone.

Essential oils, for example, can cause irritation or allergic contact dermatitis.

Before choosing a hair growth product, ask yourself a simple question.

What exactly is this product supposed to do, and is there evidence that it can do it?

Because a product designed to reduce breakage is not necessarily a product that stimulates follicular growth.

4. Heat and Chemical Damage Don't Usually Slow Follicular Growth

This is another common misconception.

People often believe that colouring, bleaching, or heat styling makes their hair stop growing.

But most of these processes primarily affect the visible hair fibre, not the follicle responsible for producing new hair.

Excessive heat can weaken the cuticle and internal protein structure.

Chemical processing can alter the hair's structural bonds and increase its susceptibility to breakage.

And repeated mechanical stress can contribute to further fibre damage.

The result?

Your hair may continue growing from the scalp while the ends are breaking off.

So it appears as though your hair has stopped growing.

This is why length retention deserves just as much attention as growth.

There are exceptions. Severe chemical burns, inflammatory injury, or significant traction can affect the scalp and follicles themselves.

But for most everyday styling damage, we're primarily talking about fibre integrity.

5. Your Scalp Deserves Attention Too

Your scalp is living skin, and your hair follicles exist within that environment.

Conditions such as psoriasis, seborrheic dermatitis, folliculitis, and certain inflammatory scalp disorders can affect scalp comfort and, in some circumstances, hair growth or shedding.

But here's something I want to clarify.

A clean scalp doesn't automatically mean faster-growing hair.

And washing your hair more frequently doesn't stimulate your follicles to produce more hair.

Good scalp care is about maintaining hygiene, managing oil and buildup, and identifying concerns that may require treatment.

Your cleansing routine should reflect your scalp's needs rather than following a universal washing schedule.

If you're experiencing persistent itching, scaling, redness, tenderness, or unexplained shedding, it's worth having your scalp assessed.

6. Stress, Sleep, and Your Hair Growth Cycle

Your hair follicles follow a natural cycle of growth, transition, rest, and shedding.

Significant physiological stressors, including illness, surgery, rapid weight loss, and major nutritional changes, can sometimes disrupt that cycle.

One possible result is a condition called telogen effluvium, where more hairs than usual enter the shedding phase.

Interestingly, the increased shedding may not become noticeable until several months after the triggering event.

This is one reason understanding someone's health history and timeline is so important when investigating hair loss.

But not every stressful week causes hair loss, and not every case of shedding is stress-related.

Sleep, nutrition, physical health, medications, hormonal changes, and medical conditions can all be relevant.

The goal isn't to blame stress for everything.

It's to recognize that hair doesn't exist in isolation from the rest of the body.

7. Know When It's Time to Investigate

If your hair seems to be growing more slowly than usual, you're noticing increased shedding, or your density is changing, don't automatically assume you need a new product.

There may be several contributing factors.

Some changes are temporary. Others may be related to genetics, hormones, medical conditions, nutritional deficiencies, medications, or inflammatory disorders.

And different causes require different approaches.

A gradual widening of the part, a receding hairline, sudden excessive shedding, and patchy hair loss are not all the same thing.

That's why identifying the pattern and understanding the history matters.

Persistent or unexplained hair loss deserves appropriate assessment, with medical referral when indicated.

The Hair Coach Perspective: Stop Chasing Faster Growth and Start With Understanding

I understand why people want their hair to grow faster.

We live in a world of quick fixes, overnight transformations, and products promising incredible results.

But hair biology doesn't operate on marketing timelines.

And sometimes the answer isn't to stimulate growth at all.

Sometimes it's correcting a deficiency.

Sometimes it's addressing a scalp condition.

Sometimes it's reducing breakage.

And sometimes it's recognizing that your hair is growing normally, but your expectations have been shaped by unrealistic promises.

Before asking how to make your hair grow faster, ask what's actually preventing you from achieving the hair you want.

That question can lead to a much more useful answer.

Because healthy hair isn't simply about how quickly it grows.

It's about understanding the follicle, protecting the fibre, and supporting the person behind both.

Start With Understanding.

Kerri Jarrett
Certified Trichologist | Red Seal Hairstylist
The Hair Coach