Hair loss is one of the most common — and most misunderstood — concerns affecting women. While it's often brushed off as "just cosmetic", your hair is more like a live dashboard for what's happening inside your body: hormones, nutrient status, stress load, gut health and cellular function all show up on your scalp sooner or later.¹²

The reassuring part? Once you understand the root cause, hair loss usually becomes far more manageable — and often at least partially reversible.¹

Key Takeaways

• Hair loss in women is rarely just a "scalp problem" – it often reflects hormones, nutrient status, gut health, liver load and stress.
• Low iron, thyroid issues, chronic stress and poor nutrient absorption are among the most common, but often missed, drivers of shedding and thinning.
• Restoring hair growth means correcting internal imbalances with nutrition, gut and liver support, stress regulation and hormone balance – not just using shampoos or serums.
• Targeted tools like antioxidant support, gut repair, gentle adrenal support and topical therapies such as red light and rosemary oil can further improve thickness and density.
• Lasting change comes from a holistic, realistic plan that works with your life, not from chasing one "miracle" product.

Over the past month alone, I've had women from all over the world tell me, "Simone, my hair is coming out in handfuls in the shower." In my clinic, low iron and low thyroid have consistently been major drivers of this, and newer research continues to support that.³ But in the last few years I've also seen another pattern emerging: chronic stress, an overburdened liver, poor gut health and rising toxic loads from food, products and environments are really pushing hair loss to a new level.¹²

Because hair growth is at least 80% driven by internal factors, topical care will only ever be part of the story. So in this blog, I want to walk you through what I look for clinically, and the steps that actually move the needle for real women with real lives (messy schedules, sugar cravings and all).

“When your hair starts talking, it’s rarely about vanity — it’s your body asking for a different kind of support.”

Understanding Hair Loss in Women

It's completely normal to lose 50–100 hairs per day as part of the natural hair cycle.¹ Problems arise when:

• Shedding suddenly increases
• Hair becomes noticeably thinner, drier or weaker
• Regrowth slows, and the scalp starts to show through

When that happens, it usually points to an underlying imbalance in hormones, nutrients, immune or nervous system function — not just a local scalp issue.¹²

The 5 (Actually 6) Main Causes of Hair Loss in Women

1. Hormonal Imbalance (The Most Common Driver)

Hormones act like conductors of the hair growth orchestra, regulating how long each strand stays in its active growth phase (anagen) before it rests and sheds.¹⁴ Disruptions in this finely tuned system can shorten the growth phase and increase shedding.

Common hormonal triggers I see in the clinic:

• Perimenopause and menopause (fluctuating and then dropping estrogen and progesterone)
• PCOS, where androgens (male-type hormones) are often elevated
• Thyroid dysfunction (both overactive and underactive thyroid)
• Postpartum hormonal shifts after pregnancy

Elevated androgens can shrink hair follicles over time (called follicle "miniaturisation"), leading to progressive thinning, especially across the crown and part line.¹⁰ In perimenopause, declining estrogen also reduces its naturally protective effect on hair, which is one reason many women notice their ponytail shrinking at this stage of life.⁸

2. Nutrient Deficiencies and Anemia

Hair is a metabolically active tissue, meaning it has high energy and nutrient demands and is very sensitive to deficiencies.⁴ When the body is short on key nutrients, it will prioritise vital organs over hair — so hair growth quietly gets downgraded.

Key deficiencies linked to hair loss:

• Iron (including low ferritin, your iron storage)³
• Zinc⁴
• Biotin (vitamin B7)⁴
• Vitamin D⁴
• Protein (amino acids are the building blocks of hair keratin ¹

Even mild deficiencies can disrupt the hair growth cycle and trigger diffuse shedding (telogen effluvium).³⁴ This is why I always check iron, thyroid and baseline nutrient status when a woman comes in with hair loss — and why "but my diet is pretty good" isn't always the whole story.

3. Chronic Stress & the Adrenal Hair Connection

Stress isn't just "in your head"; it's a full-body physiological response driven by your adrenal glands, which sit above your kidneys and produce stress hormones like cortisol and adrenaline. When stress is chronic, high cortisol can push hair follicles prematurely into their resting (telogen) phase, leading to sudden shedding 2–3 months after a stressful event.¹⁵ This pattern is called telogen effluvium.

Beyond hair loss, the "wired-and-tired" stress pattern can show up as:

• Notable shedding or thinning, especially after illness, trauma or prolonged overwhelm
• Low mood or depression, anxiety or feeling "on edge."
• Dizziness when standing up quickly
• Cravings for salt and/or sugar, and weight gain around the waist
• Low sex drive and disrupted sleep

In psychoneuroimmunology — the study of how the mind, nervous system and immune system interact — we see clearly how chronic stress alters immune activity, gut function and hormone balance, all of which can impact hair. When stress runs high for long enough, I often pair lifestyle tools with a gentle adrenal support formula to help clients' systems reset more effectively.

4. Inflammation & Oxidative Stress

Chronic low-grade inflammation and oxidative stress (an imbalance between free radicals and antioxidants) are increasingly recognised as key drivers of hair follicle damage.²⁴ Oxidative stress can alter the hair follicle environment, shorten the growth phase and make follicles more vulnerable to hormonal and immune triggers.

Common drivers include:

• Poor diet (high in ultra-processed foods, low in colourful plants)
• Environmental toxins (pollution, chemicals in products and plastics)
• Gut imbalance and increased intestinal permeability ("leaky gut")
• Blood sugar spikes and crashes throughout the day

All of this creates a hostile environment for healthy hair growth, even if your shampoo is perfect.² On the flip side, supporting antioxidant and anti-inflammatory pathways can protect follicles and improve density over time.²⁴

5. Gut Health & Absorption Issues

You can eat all the right nutrients, but if your gut isn't functioning well, you won't absorb them effectively. This is where the gut–brain axis comes in — the two-way communication between your gut and nervous system that influences digestion, mood and immune responses.

Conditions like:

• IBS (irritable bowel syndrome)
• Increased intestinal permeability ("leaky gut")
• Low stomach acid or sluggish digestion

can all contribute to nutrient-related hair loss by reducing absorption of iron, zinc, B vitamins and protein, and by increasing inflammation.¹²⁴ I often find that once we repair the gut lining and support stomach acid and enzymes, hair responds far better to the same diet and supplements.

6. An Overloaded or "Toxic" Liver

An overloaded liver is another often-overlooked contributor to hair thinning and poor hair quality. Your liver is your main detox organ, helping to process hormones, medications, alcohol and environmental chemicals so they can be safely eliminated. When it's under strain, that finely balanced detoxification system can struggle, with knock-on effects for hormones, inflammation and hair.¹²

Common liver stressors include high alcohol intake, excess caffeine, certain prescription or recreational drugs, and daily exposure to non-organic skincare, cleaning products and synthetic materials in our homes. Over time, this cumulative load can contribute to fatigue, skin issues, hormone imbalance and, for some women, hair loss that doesn't respond to topical care alone.

Proven Remedies That Actually Help Hair Regrow

Once we've identified the likely drivers, we can start to rebuild from the inside out using evidence-based solutions. There's no instant fix, but the right combination of nutrition, lifestyle and targeted support can make a profound difference.¹²⁴

1. Restore Nutrient Status (Your Non-Negotiable Foundation)

Hair regrowth depends on correcting deficiencies; you cannot build strong hair from an empty toolbox.³⁴ This step seems basic, but it's where I see the biggest shifts in shedding and texture when we get it right.

Focus on:

• Iron-rich foods (and supplementation if medically indicated): dark green and dark red vegetables such as spinach and beetroot, and iron-rich wild meats like venison or other wild game, especially if you eat animal protein.³
• Zinc: fish, pumpkin seeds, lentils and other legumes.⁴
• Biotin (B7): almonds, salmon, eggs and other whole foods, as part of a broad B-complex approach.⁴
• Vitamin D: safe sun exposure, and foods like mackerel and sardines (plus testing and supplementation where needed).⁴
• High-quality protein: wild or line-caught fish, organic eggs, legumes and nuts — aim to include protein with each meal to provide building blocks for keratin.¹

This is foundational; nothing else works well without it. For my own health, I also take 2 Rejuv Immune Restore capsules per day to maintain a solid micronutrient base and support immune and cellular health, especially during busier clinic seasons.

2. Support Hormonal Balance

When hormones are gently rebalanced, we often see less shedding and fuller regrowth over several months.¹⁰ This doesn't always require medication; nutrition, sleep and targeted herbal support can shift things in a meaningful way for many women.

• Stabilise blood sugar by pairing protein and healthy fats with carbohydrates (think salmon and veggies with quinoa, not just toast on its own). This helps to reduce insulin spikes that can worsen androgen activity.
• Use targeted herbs to support female hormone balance, such as those in the Rejuv Female Balance formula, which many of my clients find helpful alongside diet and lifestyle changes.
• Reduce excess stress with nervous system-friendly habits like breathwork, walking in nature, journaling, or gentle yoga.
• Support thyroid health with minerals and iodine-rich foods, including sea vegetables such as those in our Sea & Soil Super Greens, always alongside appropriate testing and medical guidance.³⁷

Personally, I notice that when my blood sugar is stable, and my stress is better managed, my hair and skin tell me very quickly — they're smoother, less dry, and I lose far fewer strands in the shower.

3. Reduce Oxidative Stress (The Quiet Hair Saboteur)

This is the piece most "hair routines" miss. Hair follicles are highly sensitive to oxidative damage, which can damage follicle cells and disrupt the hair cycle.²⁴ Oxidative stress also interacts with hormones and inflammatory pathways, compounding the problem.

Supporting antioxidant systems helps protect and restore follicle function by improving:

• Growth phase duration (keeping hairs in anagen for longer)²
• Follicle strength and resilience²⁴
• Regrowth capacity after shedding episodes²
• Liver detoxification pathways that help clear hormones and toxins²

Nutritionally, I encourage clients to "eat the rainbow": lots of colourful vegetables and low-sugar fruits daily, with an emphasis on bitter greens (rocket, dandelion), cruciferous vegetables (broccoli, Brussels sprouts, cabbage) and sulphur-rich foods (garlic, onions, eggs). These support glutathione, often called the body's "master antioxidant".²⁴ I often pair this with additional antioxidant support such as resveratrol, acai and grape seed extract, like those in the Rejuv Acai Antioxidant Complex, especially when oxidative stress is clearly part of the picture.

4. Manage Stress Effectively (For Real Life)

If we don't address stress physiology, hair loss often persists despite the "perfect" supplement stack.¹⁵ This is where the gut–brain axis and nervous system regulation become powerful tools, not just nice ideas.

• Prioritise sleep by aiming for a regular bedtime, reducing screen time at night, and creating a simple wind-down routine (even 10–15 minutes helps).
• Incorporate daily recovery practices such as stretching, breathwork, a short walk after meals or a brief meditation — consistency beats intensity.
• Reduce chronic cortisol elevation by setting boundaries around work, news and social media where you can.
• Embrace mindfulness practices that calm the nervous system; if you're curious, I've written more about this in our mindfulness and neuroscience article.

When stress runs particularly high, I sometimes layer in a gentle adrenal support formula. Hence, the nervous system has more nutritional "padding" while we shift habits — it's not about perfection, it's about a kinder baseline.

5. Improve Gut Health (So You Actually Absorb Your Nutrition)

Healthy hair relies on what you absorb, not just what you eat. Gut repair is often the turning point for women who've "tried everything" and still see shedding.¹²⁴

• Support digestion and gut function by slowing down, chewing each mouthful ~20 times and avoiding eating in a rushed, stressed state.
• Reduce inflammation by minimising ultra-processed foods and known personal triggers (for some, this includes excess gluten, dairy or alcohol).
• Improve nutrient absorption with natural gut boosters like kimchi, kefir and sauerkraut, plus prebiotic fibre and targeted probiotics where needed.

This helps your body actually use the nutrients required for hair growth. For many clients, I combine food-based approaches with a prebiotic blend, such as the Rejuv Digestive Complex Powder, and a broad-spectrum probiotic, such as Gut microbiome Repair, to support both the gut lining and microbial balance.

6. Red Light Therapy

Red light therapy (also called low-level light therapy) uses specific wavelengths of light, typically in the 630–850 nm range, to penetrate the scalp and stimulate mitochondria — the "powerhouses" inside cells. This increases ATP (energy) production, improves local blood flow and can prolong the anagen (growth) phase of the hair cycle, essentially "waking up" sluggish follicles.¹⁶

• Clinical studies have shown that properly dosed red light can improve hair density, thickness and growth rate in some forms of hair loss.¹⁶
• I'll be sharing more on this exciting area soon, because not all devices are created equal — some have the right wavelength and power, others are more like expensive red torches. I'll help you navigate what's actually worth your investment.

7. Rosemary Oil

Rosemary essential oil has gained strong attention as a natural support for hair growth, and newer research is starting to back up what traditional medicine has used for centuries. In one recent study, rosemary-based hair oils significantly improved hair growth rate, thickness and density compared to a basic oil alone.⁶⁹ The main mechanisms appear to be improved scalp circulation, antioxidant effects and support for follicle health.

From a functional perspective, rosemary oil helps by enhancing the scalp's "terrain" — improving blood flow, supporting mitochondria in follicle cells, and potentially modulating DHT (a potent androgen) in some contexts.⁶⁹ It's not a magic bullet, but it can be a powerful adjunct to internal work.

You must dilute rosemary essential oil — neat (undiluted) application can irritate the scalp and skin.

Recipe (2% dilution — a good starting point)

• 30 ml carrier oil (choose one:
  • Jojoba (excellent for balancing an oily or flaky scalp)
  • Argan (lightweight, good if your hair gets greasy easily)
  • Castor (thicker and more occlusive, often used for edges or very dry scalps)
• 12 drops rosemary essential oil
• Optional: 4–6 drops peppermint essential oil for an extra circulation boost (avoid if sensitive or if you get headaches easily)

Mix everything in a dark glass bottle and store it away from direct sunlight.

How to use

1. Apply a few drops to the scalp (you can part your hair in sections to distribute it more evenly).
2. Massage gently with your fingertips for 2–3 minutes to stimulate circulation.
3. Leave on for:
   • Minimum: around 30 minutes
   • Ideal: overnight if your scalp tolerates it and it fits your routine
4. Wash out with a gentle shampoo if needed, or rinse if your hair tolerates a bit of oil.

Frequency

• 3–4 times per week is usually a good balance for most scalps.
• Daily application is generally unnecessary and may increase the risk of irritation or buildup.

Why it works

• Improves blood flow to follicles, delivering more oxygen and nutrients.⁶⁹
• Supports mitochondrial activity, enhancing cellular energy production in follicle cells.⁶
• It may help with DHT-related follicle miniaturisation in some types of hair thinning.⁶⁹

Alongside a solid internal plan, I consider rosemary oil one of the strongest natural topical options we have — especially when you're patient and combine it with the nutrition, gut, liver and stress work we've talked about.

Create A Safe Internal Environment

Healthy hair is really a reflection of internal balance — hormones, nutrients, gut, liver and nervous system — not just what you put on your scalp.¹²⁴ It's not about never losing a hair again; it's about creating an internal environment where your body feels safe to grow strong, resilient strands.

The most effective approach is to:

• Identify your main drivers (iron or thyroid? stress? gut? hormones?) and address them step by step.
• Support your body at a cellular level with nutrient-dense food, antioxidants and gentle detox pathways.
• Adopt a realistic, holistic approach — perhaps with a simple adrenal or gut–brain support blend — instead of chasing quick fixes.

Hair regrowth takes time; most women need at least 3–6 months to see clear changes and 9–12 months for more significant density shifts.¹⁰⁵ But when the underlying systems are supported consistently, the body has an incredible capacity to restore balance — including in your hair. And if I'm honest, I still have evenings when I stand at the sink, eating chocolate straight from the wrapper after a long day; the difference now is that I understand my body better and know how to bring it back into balance afterwards.

As always, support your system holistically, and the results will follow — on your scalp, your skin, and in how you feel as you walk through your day.