When hair health starts to change
We often think of hair thinning as something that “just happens” with age — but for many, it’s an early sign that the body’s nutrient stores are running low. Hair is metabolically active tissue, meaning it reflects what’s happening internally. When vitamins and minerals fall out of balance, the body naturally prioritises vital organs first — and hair growth takes a back seat.
Understanding which nutrients support the hair cycle is the first step in restoring strength and fullness.
Iron and ferritin: oxygen for your follicles
Low iron and ferritin (your body’s stored iron) are among the most common causes of diffuse hair thinning, particularly in women. Without adequate iron, hair follicles struggle to receive enough oxygen, leading to slower growth and increased shedding.
Simple changes — like increasing iron-rich foods or addressing absorption issues — can make a visible difference once identified.
Vitamin D: the silent regulator of growth
Beyond its role in bone and immune health, vitamin D helps regulate the hair follicle cycle. Low levels are strongly linked to telogen effluvium (shedding) and slower regrowth. Because vitamin D deficiency is widespread in the UK, especially in winter months, this is often one of the first markers to check.
B vitamins and biotin: the energy behind strong strands
The B vitamin family — particularly B12, folate, and biotin — are crucial for the cellular energy that powers hair production. A deficiency can lead to brittle strands, premature greying, or slower regeneration after shedding.
While biotin supplements are popular, they only help if a deficiency exists. The key is understanding your baseline before adding more.
When to consider a blood test
If you’ve noticed gradual thinning, increased shedding after stress, or hair that no longer grows as it once did, it’s worth looking deeper. Blood testing provides clear answers — showing which nutrients are in range, which are depleted, and where your body may need support.
The Youth Revisited Vitamin & Mineral Panel offers a detailed look at essential markers such as iron, ferritin, vitamin D, B12, folate, and magnesium — helping you address the true cause rather than simply treating the symptom.
The takeaway
Hair is a reflection of inner health. By identifying the vitamins and minerals your body needs most, you can restore balance and rebuild strength from the inside out.