Collagen is one of the most widely used, yet often misunderstood, nutrients in health. With a growing number of proposed health benefits, alongside multiple sources, types, and plant-based alternatives, it can be difficult to cut through the noise. In particular there’s a lot of discussion about whether there is any point to taking collagen supplements. So, let’s take a detailed look at how collagen works in the body, address common misconceptions, and explain why collagen can be effective, as long as you use the right source, type, quality and formulation.  

What is collagen and why is it important? 

Collagen is the most abundant protein in the body, providing structure, strength, and elasticity to skin, joints, bones, and connective tissue. Collagen declines with age, reflecting a gradual reduction in the body’s ability to synthesise and maintain it. This process is also influenced by lifestyle and environmental factors, including diet and nutrition, sun exposure (UV-induced damage), smoking, exercise and stress. Collectively, these factors contribute to changes such as reduced skin elasticity, the appearance of fine lines, and decreased joint comfort or flexibility over time.

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Misconception 1: Collagen cannot be absorbed, so there is no point in supplementing it. 

A common belief is that collagen is completely broken down into individual amino acids during digestion and simply reused to build various proteins, including collagen. It’s also often suggested that collagen is difficult to digest. 

In reality, while whole collagen molecules are too large to be absorbed intact, digestion does not reduce them solely to free amino acids. Collagen peptide formulations are already hydrolysed, meaning they provide a mix of smaller peptides (including dipeptides and tripeptides) alongside amino acids. These peptides can be absorbed intact and may play a direct role in supporting collagen formation in the body. 

Other approaches support collagen differently. Vegan collagen formulations supply the key amino acids required for collagen synthesis, while collagen “boosters” provide nutrients such as vitamin C and antioxidants that support production and help protect existing collagen from breakdown. 

Together, these approaches work through different but complementary pathways to support healthy collagen levels.

Misconception 2: Collagen is just a source of collagen! 

As well as directly supporting structure, supplements containing collagen peptides may promote collagen and other important connective tissue components in other ways. Certain collagen peptides also act as signalling molecules, stimulating cells involved in connective tissue synthesis, including fibroblasts (supporting skin structure), chondrocytes (for cartilage), and osteoblasts (for bone formation). Collagen peptides also seem to inhibit connective tissue breakdown via matrix metalloproteinase (MMP) enzymes. (Wang, 2021) Through these mechanisms, collagen-derived peptides may support connective tissue structure and function. Importantly, peptide profiles vary depending on source and processing, which is why formulation matters. (Dierckx, 2024) 

What is hydrolysed collagen, and are all hydrolysed products equal? 

Hydrolysed collagen is collagen that has been broken down into smaller peptides, making it easier to digest and absorb. However, it is not a single, uniform ingredient. It contains a mixture of peptides, and this can vary depending on how the collagen is sourced and produced. As a result, not all hydrolysed collagen products are the same. Non-hydrolysed forms are also broken-down during digestion, but this process is less controlled and produces a less consistent mix of peptides. In practice, what matters is not just whether collagen is hydrolysed, but the type and consistency of peptides it provides. 

Misconception 3: All collagen is the same

Collagen varies by type and source, and these differences influence its structure and role in the body. Common collagen types include: 

Common sources include: 

These differences help guide formulation depending on the intended use, rather than suggesting one source is universally better.

Misconception 4: Vegan collagen is the same as collagen

Collagen is a structural protein derived from animal sources, so there is no direct vegan equivalent. However, collagen can be supported through collagen-supporting formulations, which provide nutrients such as vitamin C, rutin, zinc, and copper, and targeted amino acid formulations, which supply the building blocks required for collagen production. 

Ingredients such as Vollagen (vegan collagen) fall into the latter category. Produced via fermentation of plant-derived substrates, they deliver amino acids involved in collagen structure, including glycine, proline, and hydroxyproline. This approach provides the core building blocks for collagen synthesis, delivers them in ratios aligned with human collagen, and ensures a consistent, readily usable amino acid profile. 

Misconception 5: All collagen products are of the same quality

Collagen products can vary considerably in quality, which may influence consistency, reliability, and overall trust in the product. Key considerations include: 

For marine collagen, sustainability is often a key consideration, with certifications such as Friend of the Sea indicating responsible sourcing practices. For bovine collagen, factors such as traceability, animal welfare, and farming standards are important.  

Misconception 6: Collagen is only relevant as we age

While collagen production declines with age, it remains essential throughout life. Collagen is continuously broken down and rebuilt, with turnover influenced by physical activity, nutrition, and lifestyle. Its relevance therefore extends beyond ageing, particularly during periods of increased demand such as physical activity, recovery, environmental exposure, or where nutritional intake may limit collagen synthesis.

Misconception 7: Collagen alone is enough for skin health

Collagen is just one component of healthy skin. Optimal skin structure and appearance also depend on nutrients that support collagen formation, help protect against its breakdown, maintain hydration, and defend against environmental stress. 

Vitamin C contributes to normal collagen formation, hyaluronic acid helps maintain skin hydration and elasticity, and antioxidants such as vitamin C and rutin play a key role in protecting the skin from oxidative damage, and the breakdown of collagen. For this reason, well-designed skin formulas often combine collagen with complementary nutrients to take a more holistic approach to skin health.

Misconception 8: Collagen can replace dietary protein

Collagen is not a complete protein and does not provide the full range of amino acids required for general protein needs such as muscle maintenance. It is best considered a targeted protein for connective tissue support, rather than a replacement for dietary protein.

Misconception 9: Collagen works immediately

Collagen supplementation works gradually, with benefits building over time rather than appearing instantly. Studies assessing outcomes such as skin or joint health typically measure improvements over several weeks of consistent intake. (Asserin, 2015; Dähnhardt, 2024; de Miranda, 2021)

Misconception 10: You can easily get enough collagen from food alone

Collagen and its building blocks can be obtained through the diet, particularly from animal-based foods and general protein intake. However, typical diets may not consistently provide sufficient collagen-specific amino acids, and collagen synthesis also depends on key nutrients such as vitamin C, zinc, and copper. For this reason, supplementation may offer a more consistent and targeted approach, particularly where intake is limited or requirements are increased.