Published on 6/15/2026
In recent years, collagen supplements have turned into the star of the beauty and health market, with promises to smooth wrinkles, tighten skin, relieve joint pain and strengthen bones. But to what extent does scientific evidence support these promises?
A broad umbrella review published in 2026 in the Aesthetic Surgery Journal Open Forum reviewed the results of 113 clinical trials involving about 8,000 participants who used collagen supplements for various purposes related to skin, joints, bones, oral health and metabolism. The review concluded that collagen offers promising, but modest, benefits in three main areas:
- Skin elasticity, hydration and the appearance of fine lines.
- Musculoskeletal health.
- Alleviating some symptoms of osteoarthritis (joint roughness).
In contrast, the evidence was less convincing about collagen’s effect on oral health or sugar and cholesterol levels and blood pressure, and the review did not find strong support for its use to improve athletic performance or weight loss.
What is collagen and why does it decline with age?
Collagen is the most abundant protein in the body, and forms an essential part of the skin, bones, muscles, tendons and ligaments, as a kind of “supportive structure” that gives tissues its strength and elasticity.
It is produced by specialized cells known as fibroblasts, but its production begins to gradually decline with age at a rate of approximately 1 to 1.5% annually, so wrinkles and fine lines become more noticeable as the years pass.
It is not just a matter of age, as excessive exposure to sunlight and smoking, in addition to hormonal changes after menopause and some immune diseases such as lupus and rheumatoid arthritis, are all factors that accelerate the loss of collagen or weaken its quality.
Is food enough to replace collagen?
Collagen is found naturally in beef, poultry, fish, gelatin, and bone broth. But what ultimately matters to the body are the amino acids it gets from digesting protein, not “complete collagen” itself.
Nutrition experts point out that modern dietary patterns – based on processed foods and fast food – may not provide enough high-quality protein and the supporting elements necessary to build collagen, most notably vitamin C, zinc, copper, and antioxidants.
Therefore, improving a diet rich in good proteins, vegetables and fruits remains an essential step, whether collagen supplements are used or not.
How do collagen supplements work within the body?
Controversy still exists about the mechanism of effect of supplements. Complete collagen is broken down in the digestive system like any other protein, but so-called “collagen peptides” – which are forms broken down into smaller parts – can be absorbed better.
Some researchers liken eating it to providing the body with the “primary building materials” it needs to produce more collagen in the skin, cartilage, and bones, but:
- The degree of benefit varies from one person to another according to age, health condition and lifestyle.
- Some of the studies were funded by supplement companies, which is a reminder of the need for caution in interpreting the results.
Doctors confirm that collagen is not a magic cure, and that its effect – when it appears – is usually modest and requires months of regular use, along with a balanced diet, physical activity and good sleep.
Proven benefits for the skin… but not a miracle
Recent scientific reviews indicate that regularly taking hydrolyzed collagen, often in doses between 2.5 and 10 grams per day for periods of eight weeks to several months, may contribute to:
- Reducing the appearance of wrinkles and fine lines.
- Improve skin elasticity.
- Increase skin hydration.
- Increase collagen density in the deep layers of the skin.
Dermatologists believe that these effects are due to stimulating natural collagen production and improving the skin’s ability to retain water. But they warn that results vary from one person to another, and that supplements do not reverse the effects of the sun, smoking, or an unhealthy lifestyle, but may only provide a partial improvement in the skin for those who primarily care about their health.
What about joints, bones and muscles?
Joints are one of the areas most affected by low collagen. Erosion of cartilage or a decline in its quality contributes to joint pain and difficulty moving.
To date, studies have not proven that collagen supplements are able to rebuild damaged cartilage, but they do suggest that they may help some patients with:
- Pain relief.
- Improve the ability to move and perform daily activities.
Some research on active adults who took 10 to 20 grams daily for several months showed improvements in joint pain, motor ability, and even mood.
For bones, small studies suggest that collagen supplements, especially in postmenopausal women, may help maintain bone density as part of a comprehensive plan that includes calcium, vitamin D, and physical activity.
The recent review also found that collagen may modestly improve muscle structure and strength when combined with resistance training, perhaps by improving tendon and ligament health and supporting general motor performance, rather than by building muscle alone.
Who should be careful?
Collagen supplements are relatively safe for most healthy people in moderate doses, but experts recommend the following:
- Consult a doctor for those who suffer from kidney or liver diseases, take chronic medications, or are pregnant or breastfeeding women.
- Pay attention to the source of collagen, as many products are extracted from cows, pigs, fish or chicken, which is important for those with food allergies or for those who adhere to halal options.
- Choose products from reliable companies that conduct tests for quality and contaminants such as heavy metals.
When do the results appear?
Fast results should not be expected, most studies indicate that:
- Improvement in skin usually requires 8 to 12 weeks of daily use.
- The effect of collagen in the joints and bones – if it occurs – may take several months.
Although collagen supplements can be a useful part of a health or skin care plan for some people, they do not replace the need to consult a doctor in cases of severe joint pain or osteoporosis, nor do they replace the basics: good nutrition, movement, sleep, and protecting the skin from the sun and smoking.
