Why Your Hair Growth Products Aren't Working (The Ferritin Factor)

The Product Trap: Why Topical Treatments Cannot Fix an Internal Problem

If you are reading this, you have probably already spent hundreds of pounds on hair growth products. The serums that promise thicker hair in 90 days. The biotin gummies. The caffeine shampoos. The scalp treatments that claim to "wake up" dormant follicles. And yet here you are, still watching more hair collect in the shower drain, still noticing the widening part, still feeling that quiet anxiety every time you look in the mirror.

You are not alone, and you are not doing anything wrong. The problem is that the vast majority of hair growth products are designed to work on the outside of your scalp, but the cause of your hair loss is almost certainly happening on the inside of your body. Specifically, it is happening in your blood.

At Brighton Bio Labs, we see this pattern constantly. Clients arrive having spent years and significant money on topical treatments, only to discover through a simple blood test that the real culprit was a deficiency they never knew they had. And the most common one we find? Low ferritin.

What Is Ferritin and Why Does It Matter for Hair?

Ferritin is a protein that stores iron in your body. Think of it as your iron savings account. When your body needs iron, which it does constantly for hundreds of biological processes, it draws from your ferritin reserves. Your hair follicles are one of the tissues that depend on adequate iron to function properly.

Here is what most people do not realise: hair follicles are among the fastest-dividing cells in the human body. They require a constant supply of nutrients, oxygen, and energy to maintain the growth cycle. Iron plays a critical role in this process because it helps red blood cells carry oxygen to the scalp and supports the enzymes involved in hair fibre production.

When ferritin drops below a certain level, your body makes a rational decision. It prioritises iron for essential functions, your heart, your muscles, your organs, and it deprioritises non-essential functions. Hair growth is, biologically speaking, non-essential. Your body would rather keep your heart beating than keep your hair growing. So your follicles are starved of the iron they need, and they enter a premature resting phase called telogen. The result is diffuse thinning, increased shedding, and hair that simply stops growing as it used to.

The "Normal" Range Problem: Why Your GP Might Miss It

This is where the story gets frustrating for a lot of people. You go to your GP, you mention your hair is thinning, they run a blood test, and the results come back "normal." You are told everything is fine. But your hair is still falling out.

The issue lies in what "normal" means. The NHS reference range for ferritin typically starts at around 15 to 20 ng/mL. If your result is 22, your GP will tell you it is within range. Technically, they are correct. But here is what the research actually shows:

• A 2003 study by Kantor and colleagues, cited over 365 times in medical literature, found that women with hair loss had significantly lower ferritin levels than women without hair loss
• A 2023 review by Zhang recommended using 40 ng/mL or below as the clinical indicator of iron deficiency in otherwise healthy patients
• Multiple trichology specialists now recommend ferritin levels of 70 ng/mL or above for optimal hair growth
• A 2025 study by Al-Fawaeir found that women experiencing hair loss had a mean ferritin of just 39.34 ng/mL, compared to 48.09 ng/mL in controls

So there is a significant gap between what the NHS considers "normal" and what your hair actually needs to grow. A ferritin of 25 is technically within the standard reference range, but it is nowhere near sufficient for healthy hair growth. This is why so many people are told their blood results are fine while their hair continues to thin.

At Brighton Bio Labs, we do not just check whether your ferritin is within the standard range. We assess it against the optimal range for hair growth, which is a fundamentally different conversation.

The Gap Between "Normal" and "Optimal"

To put this in perspective:

• Below 15 ng/mL: Clinically deficient. Your GP will flag this. You will likely have symptoms beyond hair loss, including extreme fatigue, breathlessness, and pale skin
• 15 to 40 ng/mL: The grey zone. Your GP says "normal," but research consistently links this range to increased hair shedding and impaired growth
• 40 to 70 ng/mL: Improving, but still suboptimal for hair. You may notice some improvement in shedding but not full restoration of growth
• 70+ ng/mL: The optimal zone for hair growth. This is where follicles have the resources they need to maintain a healthy growth cycle

If you have been using topical hair products with a ferritin level of 30, you have essentially been trying to grow a garden without watering the roots. No amount of surface-level treatment can compensate for what is missing underneath.

It Is Not Just Ferritin: The Full Picture

While ferritin is the most commonly overlooked factor, it rarely acts alone. At our Hove clinic, we typically find that clients with low ferritin also have other deficiencies contributing to their hair loss. The most important ones include:

Vitamin D

Vitamin D receptors are present in hair follicles and play a role in the hair growth cycle. A 2013 study by Rasheed, cited over 219 times, found that low serum ferritin and low vitamin D were both independently associated with hair loss in women with telogen effluvium and female pattern hair loss. Living in Brighton, despite our coastal sunshine, vitamin D deficiency is remarkably common, particularly from October through to April.

Thyroid Function

Both an underactive and overactive thyroid can cause diffuse hair thinning. Thyroid hormones directly regulate the hair growth cycle, and even subclinical thyroid dysfunction, where levels are technically within range but not optimal, can affect hair quality and growth rate. We test TSH, Free T3, and Free T4 to get the complete picture.

Vitamin B12

B12 is essential for red blood cell production and oxygen delivery to tissues, including hair follicles. Deficiency is particularly common in vegetarians, vegans, and anyone with digestive issues that impair absorption. Low B12 often coexists with low ferritin, creating a double hit to hair growth.

Hormones

In women, hormonal shifts during perimenopause, post-pregnancy, or from conditions like PCOS can accelerate hair thinning. In men, the balance between testosterone and DHT is a well-known factor in pattern hair loss. Understanding your hormonal profile alongside your nutritional status gives us the complete picture of what is driving your hair loss.

Why Topical Products Fail Without Blood Work

Let us be clear: topical hair treatments are not useless. Minoxidil has genuine evidence behind it. PRP therapy, which we offer at Brighton Bio Labs, has strong clinical support. Red light therapy shows promise. But here is the critical point that the hair product industry does not want you to hear:

No topical treatment can override an internal deficiency.

If your ferritin is 25, applying the most expensive serum in the world to your scalp will not make your hair grow. Your follicles are being starved from the inside. The serum cannot deliver iron to your bloodstream. It cannot raise your vitamin D. It cannot correct your thyroid function.

This is exactly why we take a blood-first approach to hair restoration at Brighton Bio Labs. Before we recommend any treatment, whether that is PRP, exosome therapy, or our Stem Cell Signal Booster, we want to see your blood results. If there are deficiencies, we address those first, because treating the scalp while ignoring the blood is like painting over damp. It might look better temporarily, but the underlying problem will keep coming back.

Our Approach: Blood First, Then Treatment

When you come to Brighton Bio Labs with hair loss concerns, the first step is always a blood panel. Our Hair Loss Essentials panel tests 7 key markers that directly affect hair growth:

• Ferritin (iron stores): the single most important marker for unexplained hair loss
• Vitamin D: essential for follicle cycling
• Vitamin B12: critical for oxygen delivery to the scalp
• Thyroid function (TSH): regulates the entire hair growth cycle
• Inflammation markers (CRP): chronic inflammation can trigger and sustain hair shedding
• Hormonal markers: to identify any hormonal contribution to your hair loss

For clients who want a more thorough investigation, our Hair Loss Advanced panel covers 25+ markers including a complete thyroid autoimmune screen, full iron profile, zinc, stress hormones, and a detailed hormonal assessment.

Once we have your results, we sit down with you and explain exactly what is happening. If your ferritin is low, we discuss the most effective way to raise it, which might include dietary changes, targeted supplementation, or in cases where absorption is an issue, IV iron therapy that bypasses the gut entirely and delivers iron directly to your bloodstream.

Only once your internal environment is optimised do we discuss scalp-level treatments. This is when PRP, exosomes, and regenerative therapies can truly deliver results, because the follicles now have the raw materials they need to respond to treatment.

Real Results Start with Real Data

We understand the frustration. You have spent money on products that promised results and did not deliver. You may have been told by your GP that your blood is "fine" when it clearly is not fine enough for your hair. You might even be starting to accept that hair loss is just something you have to live with.

It does not have to be that way. A targeted blood test can reveal in days what years of product experimentation could not. And once you know the root cause, the solution becomes clear, specific, and measurable.

If you have been losing hair and nothing has worked, the answer is almost certainly not another product. It is a blood test. Read our complete guide to getting a blood test in Brighton to understand what to expect, how to prepare, and which panel is right for your situation.

Take the First Step

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Our Hair Loss Essentials panel starts from £150 and includes a face-to-face results consultation where we walk you through every marker and build a personalised plan. For a more comprehensive investigation, the Hair Loss Advanced panel covers 25+ markers.

Book your Hair Loss Blood Panel at Brighton Bio Labs today. Or if you are not sure which panel is right for you, message us on WhatsApp and we will help you decide.

You can also take our free Hair Loss Assessment Quiz to get a personalised recommendation based on your specific situation.

Brighton Bio Labs is located at The Float Spa, 125 Church Road, Hove BN3 2AN. Easily accessible from Brighton, Portslade, and across Sussex.