What Your Skin Is Telling You About Your Internal Health

Key Facts:

• Persistent skin symptoms can reflect changes occurring inside the body, not just on the surface.
• Nutrient deficiencies may impair skin repair, collagen production and barrier function.
• Hormones influence oil production, hydration and inflammatory signalling.
• Blood sugar regulation plays an important role in inflammation and collagen health.
• The gut microbiome and digestive function can influence skin through immune and inflammatory pathways.
• Chronic low-grade inflammation may contribute to redness, irritation and poor skin healing.
• Blood testing can help identify the systems contributing to your symptoms rather than relying on guesswork.

 

 

Why Skin Reflects Internal Health

 

Healthy skin relies on far more than skincare products.

Every day, the skin requires nutrients, hormones and immune signalling to support:

• Cell turnover
• Collagen production
• Hydration
• Wound healing
• Barrier integrity
• Inflammatory control

When one or more of these systems becomes disrupted, the skin often reflects it first.

The most common internal contributors we see include:

• Nutrient deficiencies
• Hormonal imbalances
• Blood sugar dysregulation
• Gut health and microbiome changes
• Immune and inflammatory responses

Rarely is there a single cause. More commonly, several systems interact, which is why assessing biomarkers together often provides more useful information than focusing on one marker in isolation.

 

 

Nutrient Status and Skin Function

 

The skin renews itself continuously, making nutrient sufficiency essential for repair and barrier function.

Suboptimal nutrient status may contribute to:

• Dry or dull skin
• Slower wound healing
• Increased sensitivity
• Inflammation
• Reduced collagen integrity

 

Biomarkers worth assessing

 

Iron Studies

 

Iron deficiency may affect oxygen delivery to tissues and has been associated with:

• Pale Appearance
• Dry skin
• Hair shedding
• Poor wound healing

Useful markers include:

• Ferritin
• Iron
• Transferrin saturation
• Total Iron Binding Capacity (TIBC)

 

Red Cell Folate

 

Folate supports DNA synthesis and cellular turnover, both essential for healthy skin renewal.

 

Omega-3 Index

 

Omega-3 fatty acids help regulate inflammatory pathways and support the skin barrier.

Lower omega-3 status has been associated with increased inflammatory skin conditions and impaired hydration.

 

Copper

 

Copper contributes to collagen cross-linking and connective tissue integrity.

 

Vitamin D

Vitamin D receptors are present throughout the skin and immune system. Low vitamin D status may influence inflammatory pathways and barrier function.

 

 

Hormones and Skin Health

 

Hormones have a direct influence on:

• Sebum production
• Skin hydration
• Collagen synthesis
• Inflammation
• Cell turnover

Changes in hormone balance often show up in the skin before they are recognised elsewhere.

Common presentations include:

• Acne and congestion
• Oily skin
• Dryness
• Increased sensitivity
• Stress-related flare-ups

Androgens and Acne

 

Higher androgen activity can stimulate sebaceous glands and increase oil production.

Markers worth assessing include:

• Testosterone
• Free Androgen Index (FAI)
• Sex Hormone Binding Globulin (SHBG)
• DHEA-S
• Dihydrotestosterone (DHT)

Oestrogen and Skin Hydration

 

Oestrogen supports:

• Collagen production
• Elasticity
• Hydration

 

Lower levels may contribute to dryness, thinning skin and reduced skin resilience.

 

Cortisol and Stress

 

Chronically elevated cortisol can increase inflammatory signalling and impair barrier function, potentially worsening acne, rosacea and delayed healing.

 

Don’t Forget Thyroid Function

 

Thyroid hormones regulate skin cell turnover and hydration.

Symptoms of reduced thyroid function can include:

• Dry skin
• Puffiness
• Hair loss
• Brittle nails

Markers worth assessing:

• Thyroid Stimulating Hormone (TSH)
• Free T4
• Free T3
• Thyroid antibodies

 

 

Blood Sugar Balance and Skin Health

 

Blood sugar regulation affects the skin through inflammation and glycation.

Glycation occurs when excess glucose binds to proteins such as collagen, potentially affecting elasticity and skin structure over time.

Poor glucose regulation may contribute to:

• Acne
• Dryness
• Increased inflammation
• Slower healing
• Premature skin ageing

 

Biomarkers worth assessing:

• Fasted Glucose
• HbA1c
• Fasted Insulin
• C-peptide

Together, these markers provide insight into both short-term and longer-term blood sugar control.

 

 

Skin and Gut Health: The Gut-Skin Axis

 

The skin and gut communicate continuously through immune, inflammatory and microbial pathways.

Emerging research suggests that alterations within the gut microbiome may influence:

• Acne
• Rosacea
• Eczema
• Psoriasis
• Skin sensitivity

Poor digestive function, reduced microbial diversity and chronic inflammation may all contribute to skin symptoms.

 

Signs that the gut may be involved include:

• Bloating
• Altered bowel habits
• Food intolerances
• Skin flare-ups that appear unpredictable

In some individuals, addressing gut health may be an important part of supporting healthier skin.

 

Inflammation and Immune Function

 

Persistent low-grade inflammation can disrupt barrier integrity and prolong skin irritation.

Symptoms may include:

• Redness
• Dryness
• Sensitivity
• Delayed healing

 

Biomarkers worth assessing:

 

High-Sensitivity C-Reactive Protein (hs-CRP)

 

A marker of systemic inflammation that may provide insight into inflammatory burden.

 

Erythrocyte Sedimentation Rate (ESR)

 

Another marker of inflammatory activity.

 

Anti-Nuclear Antibodies (ANA)

 

Where symptoms are persistent or unexplained, ANA testing may help investigate autoimmune processes that can affect the skin.

 

Why Topical Skincare Isn’t Always Enough

 

Topical skincare absolutely matters.

But when acne persists despite a consistent routine, hydration never seems to improve, or inflammation continues to flare, it may be worth asking whether something deeper is contributing.

The skin doesn’t exist in isolation.

Hormones, nutrient status, blood sugar regulation, inflammation and gut health all influence how it functions.

Looking internally can help explain why the same skincare routine works beautifully for one person and does very little for another.

 

 

Testing Skin Health Biomarkers

 

At My Atlas, we believe skin health is more than skin deep.

Our Skin Balance and Skin Balance Plus blood tests assess key biomarkers involved in:

• Hormones
• Nutrient status
• Blood sugar regulation
• Inflammation

Helping you understand what may be influencing your skin from the inside out, rather than relying solely on trial and error.

Explore our Skin Balance panels →

 

 

Frequently Asked Questions

 

Can blood tests help identify the cause of acne?

 

• Yes.
• Hormones, blood sugar regulation, nutrient status and inflammation can all contribute to acne, and blood testing may help identify underlying factors.

 

Which hormones affect skin health?

 

• Testosterone, DHEA-S, oestradiol, cortisol and thyroid hormones all influence skin hydration, oil production and inflammation.

 

Does gut health affect skin?

 

• The gut and skin communicate through immune and inflammatory pathways.
• Alterations in the gut microbiome have been associated with conditions including acne, rosacea and eczema.

 

What is the best skin health blood test in the UK?

 

• A comprehensive panel assessing hormones, nutrient status, inflammation and metabolic health can provide a broader picture than testing a single marker in isolation.

 

Final Thoughts

 

Skin concerns are often treated as surface-level problems, but the skin doesn’t function in isolation.

Hormones, nutrient status, blood sugar regulation, inflammation and even gut health all influence how the skin repairs, protects and renews itself.

While a consistent skincare routine can support the skin from the outside, understanding what’s happening internally may help explain why some symptoms persist despite doing all the “right” things.

No single biomarker tells the whole story, and skin symptoms rarely have one cause. Looking at the wider physiological picture can provide a more complete understanding of what may be contributing and help guide more personalised decisions moving forward.

At My Atlas, we believe that proactive health starts with understanding your body as a connected system, not simply treating isolated symptoms.

Explore Your Skin Health from the Inside Out

 

Our Skin Balance and Skin Balance Plus blood tests assess key biomarkers involved in:

• Hormonal health
• Nutrient status
• Blood sugar regulation
• Inflammation

Helping you understand what may be influencing your skin beneath the surface.

 

Explore our Skin Balance panels →