From the age of 40, the body's own collagen production decreases noticeably due to declining fibroblast activity and falling sex hormone levels. That is a normal process. Collagen peptides supply the body with the amino acids it assembles its own collagen from. Oestrogen and testosterone promote synthesis, while cortisol inhibits it - glycine in collagen acts as a natural antagonist. What has been examined includes estrogen therapies and their relation to skin thickness and collagen content¹, collagen peptides alongside strength training in older men with sarcopenia², and collagen hydrolysates in cultures of human dermal fibroblasts exposed to cortisol³. A holistic approach consisting of a varied diet, exercise, sufficient sleep and stress management is the usual context in which collagen peptides are taken.
Why collagen and hormones go together
Collagen is not only a building material for your skin and joints, but also a finely tuned partner of your hormone balance. Fibroblasts are the cells that build the collagen network of skin and connective tissue, and their activity has been examined in relation to oestrogen levels¹. If oestrogen levels fall, as they do during the menopause, collagen production slows down and the skin loses elasticity, bones become more fragile and connective tissue weakens². Tendons, muscle and the organic matrix of bone are largely made of collagen, and their collagen content has been examined in relation to testosterone levels⁴. This reciprocal relationship ensures that changes in the hormone balance are directly visible and noticeable - an aspect that many underestimate⁵.
Target group: Menopausal women & men over 40
For menopausal women, the decline in oestrogen and progesterone is a turning point: within a few years, collagen production can fall by up to 30%⁶, leading to sagging skin, increased wrinkling and a higher risk of osteoporosis⁷. Men over 40 experience lower muscle mass and recovery capacity as testosterone levels decline - this shows how important collagen is for the regeneration of muscles and connective tissue⁸.
What is collagen anyway?
Collagen is a fibrous structural protein that makes up about a third of all body protein⁹. It gives tissues strength and elasticity - from your skin to tendons, ligaments and bones. Without enough collagen, you would not only develop wrinkles more quickly, but also lose stability in your joints and musculoskeletal system.
Where is collagen produced and why does it decrease?
Fibroblasts in the skin and connective tissue are the main producers of collagen¹⁰. From the age of 20, their activity slows down so that you produce around 1-1.5% less collagen every year⁴. Falling oestrogen and testosterone levels after the menopause and from the age of 40 also inhibit the fibroblasts and increase the decline in collagen¹⁰.
Influence of age, diet and environmental factors
- Age: The quality of collagen decreases with every year - the fibres become more fragile and disorganized⁶.
- Nutrition: If vitamin C, zinc or copper are lacking, collagen formation does not take place optimally¹¹.
- Environment: UV radiation, smoking and air pollution promote free radicals that destroy collagen fibers and reduce synthesis¹².
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Hormones and their function
Hormones are biochemical messengers that reach target organs and tissues via the blood and trigger specific processes there, from growth and metabolism to immune reactions. They can be chemically categorized as steroids, peptides and amino acid derivatives and act either quickly via cell surface receptors or more slowly via intracellular receptors. Oestrogen, testosterone and cortisol are particularly important for skin, bones and metabolism: oestrogen controls collagen formation and bone density, testosterone supports muscle and bone metabolism, and cortisol regulates energy metabolism and stress reactions.
What are hormones and how do they work?
Hormones are chemical messengers that are produced in endocrine glands (e.g. thyroid gland, adrenal glands, reproductive organs) and released into the blood. There they bind to specific receptors of their target cells and, depending on the hormone, trigger either rapid signal transduction cascades (peptide hormones) or slow gene activation (steroid hormones). In this way, they synchronize processes such as growth, metabolism, reproduction and stress response.¹³
Mechanisms of action
- Water-soluble hormones (e.g. insulin, growth hormone) act via membrane receptors and second-messenger systems.
- Lipid-soluble hormones (e.g. steroids such as oestrogen, testosterone, cortisol) penetrate the cell, bind to intracellular receptors and directly modulate gene expression.
The most important hormones for skin, bones and metabolism
More than 50 hormones control countless functions in your body. For skin, bones and metabolism, these three in particular come into focus:
|
Hormone |
Main effect on skin & connective tissue |
Effect on bones & muscles |
Metabolic regulation |
|
Oestrogen |
Promotes collagen and elastin synthesis in skin, increases skin thickness and moisture |
Inhibits bone resorption, supports bone remodeling and density |
Influences fat distribution, blood lipid profiles and insulin sensitivity |
|
Testosterone |
Indirectly through muscle strength: firmer connective tissue, improved regeneration |
Increases muscle protein synthesis, bone mineral density and strength |
Promotes anabolism, increases basal metabolism and energy output |
|
Cortisol |
With chronically elevated levels: increased collagen breakdown and skin ageing |
Inhibits bone formation and can promote muscle loss |
Regulates gluconeogenesis, fat and protein metabolism and stress response |
Focus on oestrogen, testosterone and cortisol
Oestrogen
Oestrogen is the key hormone for women, but is also metabolically active in men. Oestrogen levels have been examined in relation to dermal fibroblast activity, skin thickness and skin elasticity. At the same time, oestrogen inhibits osteoclasts, which break down bone, and promotes the activity of osteoblasts, which is essential for bone health during the menopause. If oestrogen levels fall, collagen synthesis decreases and the risk of osteoporosis increases significantly.
Testosterone
Testosterone is not only produced in the testicles, but also in the adrenal glands. It binds to androgen receptors in muscle and bone cells, increases protein synthesis and thus promotes muscle mass and strength. At the same time, testosterone improves bone mineral density by differentiating osteoblasts and suppressing osteoclast activity. Decreasing testosterone levels after the age of 40 can lead to a loss of muscle mass and bone density.
Cortisol
Cortisol is the central stress hormone of the adrenal cortex. It activates gluconeogenesis in the liver, increases blood sugar levels and dampens the immune system. In the short term, the energy update ensures your performance, but in the long term, chronically elevated cortisol can lead to collagen breakdown, increased osteoclast activity and muscle atrophy. A balanced cortisol level, on the other hand, supports a healthy balance between stress response and regeneration.
Hormone changes after 40: What happens in the body?
From the age of 40, hormone levels begin to change in women and men - a natural process, but one that can have noticeable effects on skin, bones, muscles and general well-being.
Menopausal women: drop in oestrogen and progesterone
During the menopause, the levels of oestrogen and progesterone drop significantly. This leads to various changes in the body:
- Skin: The skin can become drier and less elastic. The collagen content decreases, which leads to a thinner skin structure.
- Bones: Bone density decreases, which increases the risk of osteoporosis. This can lead to an increased susceptibility to bone fractures.
- Muscles: A decrease in muscle mass and strength can occur, which impairs physical performance.
- Well-being: Hot flushes, sleep disturbances and mood swings are common side effects.
Men over 40: Falling testosterone levels
Testosterone levels also decrease in men with increasing age. This can have the following effects:
- Skin: The skin may lose elasticity and become drier.
- Bones: A decrease in bone density can increase the risk of osteoporosis.
- Muscles: A decrease in muscle mass and strength is possible, which affects physical performance.
- Well-being: Symptoms such as listlessness, fatigue and loss of libido may occur.
These hormonal changes are a natural part of ageing, but they can be positively influenced by a healthy lifestyle, a balanced diet and, if necessary, medical support.how does collagen influence hormone balance?
Collagen and oestrogen: a reciprocal relationship
Oestrogen, the primary female sex hormone, promotes collagen synthesis by stimulating the activity of fibroblasts - the cells that produce collagen. At the same time, oestrogen inhibits enzymes that break down collagen, which leads to increased collagen density in the skin. During the menopause, oestrogen levels fall, which leads to accelerated collagen breakdown. This results in thinner, less elastic skin and an increased risk of osteoporosis. Collagen is the main structural protein of the dermis and makes up around 90% of the organic matrix of bone — both tissues are largely the same protein.
Collagen and testosterone: what the research covers
Testosterone, the primary male sex hormone, plays a crucial role in building and maintaining muscle mass and bone density. It promotes collagen production in muscles and tendons, which helps to strengthen these tissues. With increasing age, testosterone levels fall, which can lead to a decrease in muscle mass and bone density. Collagen is the most abundant protein in tendons, ligaments and the organic matrix of bone. Collagen peptides supply the amino acids the body assembles those structures from.
Collagen and cortisol: protection against stress-induced degradation
Cortisol, the so-called stress hormone, is increasingly released in stressful situations. Chronically elevated cortisol levels can promote collagen breakdown, which leads to a weakening of the skin, bones and connective tissue. Glycine is the most abundant amino acid in collagen, so collagen peptides are correspondingly rich in it. The close link between collagen and hormones shows how important a balance of these components is for your health. By adopting a conscious lifestyle that includes a balanced diet, regular exercise and stress management, you can positively influence both your hormone balance and your collagen levels. In this way, you support the health of your skin, bones, muscles and connective tissue - for a vital life, even beyond the age of 40.
The close connection between collagen and hormones shows how important a balance of these components is for your health. By adopting a conscious lifestyle that includes a balanced diet, regular exercise and stress management, you can positively influence both your hormone balance and your collagen levels. In this way, you support the health of your skin, bones, muscles and connective tissue - for a vital life, even beyond the age of 40.
Collagen deficiency due to hormonal imbalances - and vice versa?
Collagen deficiency and hormonal imbalances interact closely. If your hormone levels are out of balance, this directly reduces the activity of fibroblasts, which are responsible for collagen production. High cortisol levels, for example, inhibit collagen synthesis and at the same time accelerate its breakdown - a vicious circle that quickly leads to weakened skin, brittle bones and weaker connective tissue.
How hormonal imbalances can inhibit collagen formation
Even small shifts in hormone concentrations can severely slow down the fibroblasts. Stress hormones such as cortisol block the signals for collagen production and activate enzymes that break down collagen fibers.¹³ Other hormones, such as parathyroid hormone, can also reduce collagen expression in small amounts. Particularly in phases of life with declining sex hormones - such as during menopause or andropause - there is therefore a noticeable reduction in skin thickness and increasing joint and tendon weakness.¹⁴
Why low collagen levels can lead to hormonal imbalance
A collagen deficit acts as a catalyst for hormonal imbalances. Weak connective tissue provides less cushioning against physical and psychological stressors, so that the body remains in an elevated cortisol state for longer. At the same time, micro-injuries in the tissue promote chronic inflammation, which can disrupt overall hormone production via the stress and sex hormone axes (HPA and HPG axes).¹⁵
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Study situation: Research on the collagen-hormone axis
Clinical studies on collagen and estrogen loss
Studies in postmenopausal women have recorded wrinkle depth and skin thickness after a daily oral intake of collagen peptides over several weeks. Oestrogen levels remained low in those participants.
Research into collagen, testosterone and muscle strength
In older men with sarcopenia, a twelve-week trial recorded hand grip strength and fat-free mass in participants taking daily collagen peptides alongside resistance training.
Collagen and stress: keeping an eye on cortisol
Cultures of human dermal fibroblasts have been used to examine how collagen hydrolysates affect the way those cells respond to cortisol³. Laboratory findings of that kind do not transfer straightforwardly to people.
Natural ways to support hormones & collagen
Your body is a finely tuned system in which hormones and collagen work hand in hand. With targeted measures, you can promote this balance and strengthen your skin, bones and well-being.
Nutrition: Which nutrients help with synthesis?
A balanced diet provides the building blocks for collagen production and supports your hormone balance at the same time.
- Vitamin C: Contributes to normal collagen formation and to the protection of cells from oxidative stress. Found in abundance in citrus fruits, berries, peppers and broccoli.
- Zinc: Contributes to normal DNA synthesis and to the maintenance of normal skin. Good sources are pumpkin seeds, pulses and wholegrain cereals.
- Amino acids: Glycine, proline and lysine are essential for collagen structure. You can find these in meat, fish, eggs and pulses.
By regularly integrating these nutrients into your meals, you lay the foundation for strong connective tissue and balanced hormones.
Exercise & sleep: regulating factors for hormones and collagen
Regular physical activity increases blood circulation and promotes the supply of nutrients to the skin, which stimulates collagen production. Strength training in particular can improve the firmness and elasticity of the skin.
Restful sleep is also crucial. During sleep, the body regenerates and the production of growth hormones, which support collagen synthesis, is stimulated. Ensure a peaceful sleeping environment and regular sleeping times to promote this natural process.
Stress reduction: lower cortisol - protect collagen
Chronic stress leads to increased cortisol levels, which can inhibit collagen production and accelerate the breakdown of connective tissue. Relaxation techniques such as yoga, meditation or breathing exercises help to reduce cortisol levels and preserve the collagen structure.
Collagen as a dietary supplement - useful for hormonal changes?
From the age of 40, endogenous collagen production decreases by around 1-2% per year, which is exacerbated by declining hormone levels (oestrogen, testosterone). Collagen peptides supply the amino acids the body assembles its own collagen from. Studies have recorded skin elasticity and wrinkle depth in postmenopausal women and body composition and muscle strength in older men, at different doses and over different periods.¹⁶
When should collagen be added?
Many people take their portion in the morning on an empty stomach, others right after training or in the evening. There is no solid evidence on timing — what matters more is taking the daily amount regularly at all.
Take a look at the joint & cartilage collagen powder — collagen peptides for your daily routine, in sport and in everyday life. Benefit from the 30-day money-back guarantee and find out which collagen product from the Kollagen Institut suits you best.
Note differences between men and women
Physiologically, men and women process collagen peptides largely in the same way, but their specific needs vary. Menopausal women often reach for collagen peptides during the phase in which oestrogen falls and skin and bone lose collagen. Men, on the other hand, often use collagen supplements to maintain muscle mass, tendon elasticity and joint flexibility - especially in the context of declining testosterone levels after 40.
Which form is suitable? Collagen peptides, hydrolysate, combination preparations?
- Collagen peptides (hydrolysate) are already broken down into their smallest building blocks, which maximizes absorption in the intestine and increases bioavailability.
- Multi-combination products combine collagen with further ingredients such as hyaluronic acid or biotin. The powders and capsules in this range contain collagen peptides without added vitamins or minerals.
- Gelatine is a cheaper alternative, but contains longer peptide chains and is less easily absorbed than hydrolysate.
In practice, collagen hydrolysates have become the standard. When buying, pay attention to quality (e.g. from pasture farming or wild-caught fish), the lowest possible degree of processing and a transparent, documented analysis.
Conclusion: Understanding and using the collagen-hormone connection
From the age of 40, your body begins to produce less collagen - a process that is further accelerated by hormonal changes such as falling oestrogen and testosterone levels. These changes can affect your skin, bones, muscles and general well-being.
Collagen peptides supply the amino acids - glycine, proline and hydroxyproline - that the body uses as raw material for its own collagen. Studies on collagen peptides have recorded skin elasticity, bone density and muscle parameters — in different groups, at different doses and over different periods.
But collagen alone is not a panacea. A holistic approach that includes a balanced diet, regular exercise, adequate sleep and effective stress management is crucial. Vitamin C, zinc and amino acids such as glycine play an important role in collagen synthesis and should not be missing from your diet.
By understanding the link between hormones and collagen and taking appropriate action, you can actively contribute to your health and well-being. Start today to give your body the support it deserves.
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