The subtle changes many people notice first and what science says about collagen decline, ageing, skin, joints, energy and regeneration.

11. May 2026   |   ⏱ 6-minute read   |   🔬 Science-backed educational content

Collagen is often associated with skincare and beauty, but in reality, it is one of the most important structural proteins in the human body. It plays a central role in the skin, joints, connective tissue, cartilage, blood vessels, hair and even tissue regeneration.

What many people do not realise is that collagen production naturally begins to decline surprisingly early in life.

Scientific literature suggests this gradual decline may begin around the mid-20s, long before most visible signs of ageing appear. Over time, the body’s ability to produce and maintain collagen changes and the effects may become noticeable in different ways.

Below are five of the most commonly discussed signs associated with declining collagen production, explained through a science-based and easy-to-understand perspective.

*Important: This article is for educational purposes only and does not constitute medical advice, diagnosis or treatment. The signs discussed below may have many different causes unrelated to collagen.

 

1. Your Skin Doesn’t Feel as Firm or Elastic as Before

Why does collagen matter for skin structure?

Collagen makes up approximately 70–80% of the skin’s dry weight and acts as a structural support network that helps maintain firmness, elasticity and hydration.

When collagen levels are higher, skin tends to appear smoother, plumper and more resilient. As production gradually declines with age, the skin’s structure may slowly begin to change.

Research suggests collagen production may decrease by approximately 1–1.5% per year starting around age 25. By middle age, cumulative collagen loss can become more visible — particularly around the face, neck and hands.

Common changes people often notice

Fine lines become more visible

Skin may appear thinner or less “full” over time.

Loss of elasticity

The skin may not “bounce back” as quickly as it once did.

Increased dryness

Collagen also contributes indirectly to moisture retention and skin barrier support.

Changes around high-movement areas

Crow’s feet, smile lines and neck texture are often among the earliest visible areas.

📊 Estimated collagen decline: ~1–1.5% per year after the mid-20s

2. Your Joints May Feel Different During Movement or Exercise

What does collagen do in joints?

Cartilage (the connective tissue that cushions joints) is largely composed of type II collagen. This protein helps cartilage remain flexible, durable and shock-absorbent.

As collagen production changes with age, the body’s natural cartilage maintenance processes may also evolve over time.

This does not automatically mean disease or joint problems. However, many people report gradual changes in joint comfort, mobility or recovery as they get older.

Areas people most commonly mention

• Knees
• Hips
• Fingers
• Lower back and spine
• Shoulders

Why physically active people often pay attention to collagen

Athletes and active individuals place repetitive mechanical stress on connective tissues and cartilage. Because of this, collagen has become an increasingly researched topic in sports nutrition and recovery science.

🦴 Connective tissue health and collagen are closely linked in scientific research

3. Hair and Nails May Become More Fragile Over Time

The collagen–keratin connection

Hair and nails are primarily made from keratin, but keratin production depends on several amino acids, including proline, which is one of the major amino acids found in collagen.

This is one reason collagen is increasingly discussed not only in skincare, but also in beauty and wellness conversations surrounding hair and nail appearance.

Changes some people report over time

Hair may feel thinner or weaker

Particularly during periods of ageing, stress or hormonal changes.

Nails may become more brittle

Some people notice increased splitting or breakage.

Texture may gradually change

Hair can sometimes appear less smooth or resilient than before.

It is important to note that these changes can also be influenced by nutrition, hormones, stress, sleep, iron levels and other lifestyle factors.

💅 Proline plays a role in both collagen structure and keratin synthesis

4. Your Body May Take Longer to Recover or Regenerate

Why collagen matters for regeneration

Collagen is heavily involved in the body’s natural tissue repair processes.

When the skin or connective tissue experiences stress or injury, the body builds a temporary collagen framework that acts as a “scaffold” for regeneration and tissue rebuilding.

This process is essential in normal wound healing and tissue recovery.

What people often notice with age

Minor cuts may heal more slowly

Compared with younger years.

Skin recovery can feel less efficient

Especially after irritation, dryness or environmental stress.

Physical recovery may feel different

Many active adults notice that recovery after exercise changes gradually over time.

Why this matters beyond appearance

Collagen is not simply a “beauty” topic. It is a structural protein deeply connected to how tissues maintain strength, flexibility and resilience throughout the body.

🔬 Collagen acts as part of the body’s structural repair framework

5. Energy Changes and Collagen Decline May Happen in Parallel

The emerging conversation around NAD+ and collagen

One of the most interesting developments in longevity and healthy ageing research is the growing discussion around the relationship between collagen and NAD+.

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme involved in cellular energy production and mitochondrial function. Its levels naturally decline with age — similarly to collagen production.

Why researchers are interested in the connection

NAD+ is involved in the activity of enzymes linked to collagen structure and maintenance, including lysyl oxidase, which contributes to collagen fibre cross-linking.

In simple terms: collagen quality depends not only on collagen itself, but also on the cellular environment that supports its formation.

This has led to increasing scientific interest in how cellular energy and structural ageing may be interconnected.

⚡ NAD+ and collagen both decline with age — and may be biologically connected

Frequently Asked Questions About Collagen

At what age does collagen production begin to decline?

Most scientific sources suggest collagen production gradually begins declining around age 25. In women, this process may accelerate during menopause due to hormonal changes, particularly declining oestrogen levels.

Is liquid collagen different from powder or capsules?

Hydrolysed collagen in liquid format is already dissolved before consumption, which may simplify digestion and absorption. However, consistency and long-term use are generally considered more important than format alone.

Why do some formulations combine collagen and NAD+?

Because both collagen production and NAD+ levels decline with age, some wellness formulations combine them as part of a broader healthy ageing approach. Researchers are increasingly studying the biological relationship between cellular energy and collagen structure.

Do men and women lose collagen differently?

Yes. Women often experience a more rapid collagen decline around menopause, while men typically experience a more gradual age-related reduction over time.

This is one reason some collagen products are formulated specifically for men or women.

What lifestyle factors may accelerate collagen decline?

Scientific literature commonly associates the following with accelerated collagen ageing:

• Excessive UV exposure
• Smoking
• High sugar intake
• Chronic stress
• Poor sleep quality
• Low vitamin C intake

Vitamin C is especially important because it contributes to normal collagen formation in the body.

Essenzavital Liquid Collagen with NAD+

Daily collagen support with added NAD+

Essenzavital Liquid Collagen + NAD+ was developed to combine hydrolysed collagen peptides with NAD+ support in one convenient daily formula.

Key features

• 💧 Liquid collagen format
• ⚡ Added NAD+
• 🔬 Hydrolysed collagen peptides
• 👩 Female formula available
• 👨 Male formula available

The formulations were designed with different physiological needs in mind, recognising that men and women experience collagen changes differently over time.

Essenzavital products are food supplements, not medicines. They are not intended to diagnose, treat, cure or prevent any disease.

Final Thoughts

Collagen decline is a natural part of ageing, not a medical condition, but a biological process that affects multiple systems throughout the body over time.

Changes in skin elasticity, joint comfort, hair and nail condition, tissue recovery and even energy-related processes are all areas increasingly discussed in connection with collagen and healthy ageing research.

At the same time, it is important to remain balanced and scientifically grounded: none of these signs alone can confirm a collagen deficiency or any specific health condition.

What modern research increasingly highlights is this:

Collagen is not only about appearance. It is a foundational structural protein connected to movement, resilience, regeneration and the broader biology of ageing itself.

Legal Disclaimer

*This article is intended for educational and informational purposes only. It does not constitute medical advice, diagnosis or treatment recommendation. Always consult a qualified healthcare professional regarding any medical concerns or symptoms.

Essenzavital products are food supplements and are not intended to diagnose, treat, cure or prevent any disease. Individual experiences may vary.

This content has been written in alignment with applicable EU food supplement communication principles, including Regulation (EU) No 1169/2011 and general advertising compliance standards for wellness products.