Do Topical Treatments Really Work for Alopecia Areata? The Science Behind Supporting Hair Regrowth

One of the questions I get asked the most is:

“What can I put on my scalp to make my hair grow back?”

And I completely understand why. When you are losing your hair, you want something you can do. Something tangible. Something that gives you hope that you are helping your hair follicles recover.

I know because I have been there too. After developing alopecia areata at the age of seven and experiencing recurring patches of hair loss for over 25 years, I tried so many different approaches. I remember spending evenings applying different remedies to my scalp, hoping I had finally found the missing piece.

My personal favourite was onion juice applied at night, followed by black seed oil with a tiny amount of diluted oregano oil. It might sound unusual, but interestingly, some of these traditional remedies are now being explored more in research.

However, would I say these topical approaches alone were the reason I recovered from alopecia?

No.

For me, the biggest transformation happened when I stopped only asking, “How do I make my hair grow?” and started asking, “Why has my immune system changed its relationship with my hair follicle?”

With my background in Medical Science, specialising in Biochemistry and Immunology, and now through my clinical work as a Registered Nutritionist and Functional Medicine Practitioner supporting people with autoimmune conditions, I have become fascinated by the complexity of the hair follicle.

Because although alopecia areata is not simply a scalp problem, the scalp and the follicle environment still matter.

The Hair Follicle Is More Than Just Hair

One of the most fascinating things I have learned, and something that researchers such as Professor Ralf Paus have spent decades exploring, is that the hair follicle is not a passive structure.

It is a highly active mini-organ with its own immune system, metabolism and complex communication network.

In fact, the hair follicle is one of the few sites in the body with what we call “immune privilege” — a unique protective environment that helps shield it from unnecessary immune attack.

To produce hair, the follicle requires huge amounts of energy, healthy blood flow, nutrients, oxygen, balanced immune signalling and protection from excessive oxidative stress.

In alopecia areata, one of the key processes we see is a breakdown in this hair follicle immune privilege. The follicle essentially loses part of its protective status, allowing immune cells to recognise and target it, disrupting the normal hair growth cycle.

This is why I believe we have to ask a much deeper question:

What changed the environment around the follicle that allowed this process to happen?

My work always focuses on understanding what may be influencing immune regulation beneath the surface — but at the same time, we can also support the local follicle environment while we address those deeper drivers.

Onion Juice

Onion juice is probably one of the strangest things I tried during my own journey, but it is also one of the most interesting.

There has actually been a small study looking at onion juice in alopecia areata, where researchers found increased hair regrowth compared with the control group.

Of course, this doesn’t mean onion juice is a miracle treatment. It was a small study and we need much more research.

But when we look at the possible mechanisms, it becomes interesting.

Onions naturally contain sulphur compounds, which may support the structure of keratin, the main protein found in hair. They also contain compounds with antioxidant properties, which may help protect the follicle environment from oxidative stress.

And oxidative stress is something we are increasingly recognising as part of the alopecia picture.

This is one of the reasons I often look beyond standard blood testing in clinic. While we do not currently have a single test that can tell us exactly why someone has developed alopecia areata, we can assess some of the underlying biological pathways that may influence immune regulation and hair follicle health.

For example, the Metabolomix+ test that I use in clinic can provide insight into areas such as oxidative stress, mitochondrial function, nutrient status, fatty acid balance and detoxification pathways — all systems that may influence how well our cells, including those within the hair follicle, are functioning.

It is important to say that these markers are not diagnostic markers for alopecia areata, and we cannot say that one abnormal result directly causes hair loss. However, they can help us understand the wider environment the follicle is living in and where someone may need more personalised support.

You can find out more about the Cell Health (Metabolomix+) test here.

Black Seed Oil

Another topical I personally loved was black seed oil, also known as Nigella sativa.

The main active compound in black seed oil is thymoquinone, which has been researched for its antioxidant and immune-modulating properties.

This is interesting because the hair follicle is extremely metabolically active. When cells are working hard, they produce more oxidative by-products, which means they require a strong antioxidant defence system.

Research suggests oxidative stress may contribute to the collapse of hair follicle immune privilege and disrupt normal follicle function.

So although black seed oil is not “fixing” the immune process behind alopecia, it may be one way of supporting a healthier environment around the follicle.

Rosemary Oil

Rosemary oil has received a lot of attention recently, especially after studies comparing it with conventional approaches in androgen-related hair loss.

The research is not specific to alopecia areata, which is important to highlight because different types of hair loss have different mechanisms.

However, rosemary is interesting because of its potential impact on circulation, oxidative stress and inflammatory pathways.

The hair follicle depends on a healthy supply of nutrients and oxygen from the bloodstream. Improving the environment surrounding the follicle may help support its ability to function.

Red Light Therapy

Red light therapy is another area I find fascinating because it connects directly with mitochondrial health.

The hair follicle is one of the most energy-demanding structures in the body. Creating a new hair fibre requires rapid cell division, communication and repair.

Red light works through a process called photobiomodulation, where certain wavelengths of light are absorbed by the mitochondria, particularly through an enzyme called cytochrome c oxidase.

This may help support ATP production — the energy currency of our cells — as well as antioxidant pathways and cellular repair mechanisms.

This is why red light therapy is being explored as a way to support the follicle’s ability to move into and maintain the growth phase.

Of course, as with all topical approaches, red light therapy is not addressing the underlying drivers of alopecia areata on its own. However, as part of a wider approach focused on supporting the immune system, cellular health and the follicle environment, I think it can be a really interesting tool.

The device I personally use and recommend is the BON CHARGE Red Light Therapy Cap, which delivers targeted red light directly to the scalp. If you would like to try it, you can use my code AUTOIMMUNITY for 15% off at checkout.

Microneedling & PRP

Microneedling and platelet-rich plasma (PRP) work slightly differently because they are based around stimulating repair and regeneration.

Microneedling creates controlled micro-injuries in the skin, which encourages the body to activate healing pathways. This may influence growth factors, collagen production and signalling around the hair follicle.

PRP uses concentrated platelets from your own blood, which contain growth factors involved in tissue repair and communication between cells.

The aim with these treatments is not simply to “force” hair to grow, but to provide signals that encourage the follicle to function again.

However, if the immune system is still actively targeting the follicle, stimulation alone may not always be enough.

The Lesson I Learned After 25 Years With Alopecia

Looking back, I don’t regret trying topical treatments. They helped me feel like I was supporting my hair, and I genuinely believe the follicle environment matters. But the biggest shift came when I stopped seeing alopecia as a hair problem.

The hair follicle is the place where we see the symptoms, but often the conversation needs to go much deeper.

We need to understand what is affecting immune regulation, nutrient delivery, mitochondrial function, hormones, stress signalling, gut health and environmental triggers.

My approach today is always two-sided. We support the internal environment that influences the immune system, while also supporting the local environment where the hair needs to grow.

Because the goal is not just to stimulate hair growth.

It is to create an environment where the body feels safe enough to grow hair again.

If you are experiencing hair loss and want to understand the foundations I focus on first, you can download my free guide, Optimising Hair Growth, here

Frequently Asked Questions About Topical Treatments For Alopecia Areata

Can rosemary oil help alopecia areata?

Rosemary oil has become a popular natural option for supporting hair growth. Most of the current research focuses on androgenetic alopecia (pattern hair loss), rather than alopecia areata specifically.

However, rosemary oil is interesting because it may support some of the processes important for healthy follicles, including circulation, oxidative stress balance and inflammatory pathways.

For alopecia areata, I recommend looking beyond the scalp and also considering why the immune system has started targeting the follicle.

Does onion juice really regrow hair?

There is a small study suggesting onion juice may support regrowth in some people with alopecia areata.

Researchers believe this may be due to its sulphur-containing compounds and antioxidant properties, although more research is needed.

I personally used onion juice during my own alopecia journey, but I always emphasise that it was only one piece of a much bigger picture.

Is black seed oil good for alopecia areata?

Black seed oil contains thymoquinone, a compound studied for its antioxidant and immune-modulating properties.

Because oxidative stress and immune signalling are involved in alopecia areata, this is an interesting area of research.

However, black seed oil should be seen as a supportive tool rather than a standalone treatment.

Can red light therapy help alopecia areata?

Red light therapy is being researched for its effects on the hair follicle environment.

It may support mitochondrial function, cellular energy production and signalling pathways involved in hair growth.

Although research is still developing, it is an area I find fascinating because the hair follicle requires a significant amount of energy to produce healthy hair.

What is the best natural treatment for alopecia areata?

There is unlikely to be one single “best” treatment because alopecia areata is a complex immune condition.

While topical treatments may support the follicle externally, it is also important to investigate internal factors such as nutrient status, gut health, thyroid function, stress physiology, mitochondrial health and environmental triggers.

A whole-body approach considers both the immune system and the environment the hair follicle is living in.