A sweeping review of nearly 8,000 people finds collagen supplements can improve skin and ease osteoarthritis symptoms over time, but do not meaningfully boost sports performance. Researchers say the results can help cut through hype and guide smarter use.
Collagen supplements may help your skin glow and your joints feel better as you age, but they are unlikely to turn you into a better athlete, according to the most comprehensive analysis of collagen’s health effects so far.
Researchers from Anglia Ruskin University (ARU) led an umbrella review that pulled together evidence from 16 systematic reviews, 113 randomized controlled trials and almost 8,000 participants worldwide. The study, published in the Aesthetic Surgery Journal Open Forum, focused on collagen taken as a supplement and looked across major health areas, from skin and joints to muscles, teeth and heart health.
The team found clear benefits for skin health and for people living with osteoarthritis, a common form of arthritis that causes joint pain and stiffness. They also saw modest gains in measures linked to healthy aging, such as muscle mass and tendon structure. But when it came to sports performance and rapid recovery after exercise, collagen fell short.
“This study brings together the strongest evidence to date on collagen supplementation,” co-author Lee Smith, a professor of public health at ARU, said in a news release.
Collagen is the main structural protein in skin, bones, tendons and other connective tissues. As people age, natural collagen levels decline, contributing to wrinkles, reduced skin elasticity and joint problems. That has helped drive a booming market for collagen powders, drinks and capsules, often promoted for anti-aging, beauty and athletic performance.
To cut through the marketing claims, the ARU team conducted the first integrated meta-analysis and meta-regression across all major health domains associated with collagen intake. In simple terms, they did not just summarize past reviews; they also used statistical tools to examine how collagen’s effects change with different doses and how long people take it.
That approach revealed dose- and duration-dependent effects. Longer-term collagen use was linked with greater improvements in skin elasticity and hydration. People with osteoarthritis who took collagen over time also saw better outcomes, including reduced pain and stiffness.
These findings support the idea that collagen can play a role in healthy aging when used consistently, rather than as a quick fix. The review also identified modest benefits for muscle mass, muscle architecture and tendon structure, which may matter for older adults trying to maintain strength and mobility.
However, the study found no meaningful improvements in post-exercise muscle recovery, soreness or tendon mechanical properties. That suggests collagen is not a fast-acting sports performance supplement, despite being marketed in some fitness circles as a way to bounce back faster from workouts or injuries.
Beyond skin, joints and muscles, the researchers examined studies on oral health and cardiometabolic indicators such as cholesterol, blood pressure and blood sugar. In these areas, the evidence was mixed or inconclusive. There was little strong support for the idea that collagen supplements significantly improve metabolic health, gum disease or cosmetic dental outcomes.
The review also noted that more recent trials tend to show stronger results in some areas. That may reflect improvements in how collagen products are formulated and in the quality of research designs, such as better controls and more rigorous outcome measures.
For consumers, the message is nuanced. Collagen is not a cure-all, but the evidence suggests it can be a useful tool for specific goals, particularly for skin health and osteoarthritis relief, when taken regularly over time. At the same time, people should be cautious about bold claims related to sports performance, heart health or dental aesthetics that are not strongly backed by data.
Smith emphasized that the work is as much about setting realistic expectations as it is about highlighting benefits.
“This study marks an important step towards more informed public guidance and better designed future research. We need more high-quality clinical trials, including research examining long term health outcomes, optimal dosing and differences between collagen sources,” he added.
Looking ahead, the researchers argue that future trials should compare different types and sources of collagen, test a range of doses and follow participants for longer periods. That could help answer practical questions many people have, such as how much collagen to take, for how long, and whether certain formulations work better than others.
For now, the new review offers a clearer picture: collagen supplements can support skin and joint health as part of a long-term routine, but they are not a magic bullet for performance or overall wellness.
Source: Anglia Ruskin University