Collagen pills don’t improve hair growth and here is why18 min read

Whether in the form of collagen pills, collagen powders or collagen serums, collagen is often featured in hair growth supplements, whether on its own, as a powder or liquid, or as part of the additional ingredient to other vitamins, often biotin. However, taking collagen supplements have challenges related to collagen’s biochemistry, bioavailability and the size of its molecules. Today we answer a question – does collagen help hair growth and can you trust the hype?

The collagen craze

collagen for hair growth

Collagen has gained significant attention for its role in maintaining healthy skin and hair. As you enter your mid-20s, you are likely to encounter advertisements featuring women with flawless skin, attributing their appearance to collagen. This raises the question of whether collagen truly contributes to a healthy glow, beyond the realm of Photoshop. Drugstores offer shampoos enriched with collagen, too…

If you browse through your social media feed, you’ll come across at least one influencer or celebrity attributing their youthful complexion to collagen supplements or treatments. Beauty salons also provide various collagen-based solutions, such as masks, microneedling, and injections, albeit at a higher cost. This leaves you wondering whether you should consume collagen, apply it topically, or invest in expensive beauty clinic treatments.

Amidst this overwhelming array of choices, we embarked on a quest for answers and decided to delve into the role of collagen in hair growth.

An abundant protein

Collagen is the main structural protein found in the various connective tissues in the body. It is the most abundant protein in mammals, making up 25% to 35% of the whole-body protein content. Collagen consists of amino acids which are wound together to form the triple helix of the collagen molecule. It is mostly found in fibrous tissues, such as tendons, ligaments and skin.

collagen for hair growth

Although only a small amount of collagen is found in the outer layers of hair shaft itself – collagen plays a key role in maintaining healthy function of a hair follicle.

Hair follicles are the tiny structures in the skin from which hair grows. They consist of various components, including the dermal papilla, hair bulb, and hair shaft. Collagen, being a structural protein, plays a vital role in supporting the integrity of these components.

Collagen contributes to the elasticity, structure and strength your skin – the dermis – the layer where your hair root resides. With age, your body becomes less efficient at producing collagen and replenishing cells in the dermis. The area where hair bulb is doesn’t get enough structural support, so it can collapse into itself, without necessary amount of collagen fibres to support it.

Some lifestyle factors (e.g. tobacco smoking, diet high in highly processed foods and sugar, stress, alcohol consumption) impact your body’s ability to manufacture collagen to support the structure of your dermis. This may be one of the reasons why your hair gets thinner over time.

collagen for hair growth

Collagen benefits for hair

Collagen is found in the skin tissue surrounding the follicle. It provides structural support to the hair follicles by surrounding and stabilizing them. It forms a network of fibers that help maintain the shape and strength of the follicles. This structural support is essential for healthy hair growth, as it prevents the follicles from becoming weak and fragile.

A number of studies have found that during anagen (growth) stage of the hair, the amount of collagen surrounding the hair bulb also increases and thickens – therefore providing enough structural support for the hair follicle to develop new hair.

As the hair follicle matures into the catagen stage, it loses two layers of collagen surrounding it. During growth stage, these layers re-grow, likely as a supporting structure for the hair bulb to develop again, maintaining the healthy cycle of hair growth. By maintaining the integrity of the hair strands, collagen helps promote overall hair health and minimize hair loss.

Collagen for scalp blood flow

Collagen indirectly supports blood flow to the skin and scalp by promoting the health and integrity of blood vessels, specifically small capillaries responsible for delivering oxygen and micronutrients to your hair follicles.

It is a key component of the walls of blood vessels, providing strength and stability. Collagen helps maintain the elasticity and flexibility of blood vessels, allowing them to expand and contract as needed to regulate blood flow. When blood vessels are healthy and functioning optimally, they can deliver essential nutrients and oxygen to the scalp and individual hair follicles.

Moreover, collagen supports the production and maintenance of another protein called elastin, which contributes to the elasticity of blood vessels. Elastin allows blood vessels to stretch and recoil, enabling efficient blood flow and better delivery of nutrients to the roots of your hair.

Your hair follicles also need T cells and macrophages – immune cells – in order to pass through catagen into anagen (growth) stage at every growth cycle. Blood delivers those cells, pointing to the necessity of healthy blood flow to scalp to grow healthy hair, as well as alleviating hair loss that comes from a shortened anagen stage.

Collagen supplements for hair: the myths

So how do you provide enough collagen for your hair to grow?

Since collagen is a form of protein, your body cannot digest it whole in its pure form. It needs to break it down and digest it just like any other protein you eat. Hydrolyzed collagen (also known as collagen peptides) is a broken down into more easily dissolvable amino acids type of collagen. Your body processes the amino acids – namely lycine, glycine and proline – by releasing them into blood stream, and transforming into the building blocks that can become collagen in your scalp and hair follicles.

collagen supplements for hair growth

However, if your body is deficient in these amino acids in other parts of your body, for example, your skin, bones or cartilage – then it will prioritise those areas to top them up with these amino acids and not your hair. While some amounts of protein consumed as part of your diet or supplements can and do end up in your hair follicles, you’re leaving it up to your body to decide where it goes.

This makes ingesting collagen an inefficient way of replenishing the reserves of collagen for hair growth and collagen benefiting your hair.

Topical collagen for hair growth: the myths

What about collagen creams, shampoos and other collagen treatments for hair? Collagen molecules are simply too large to penetrate the skin, including that on your scalp. Therefore any topical products claiming to boost collagen production in skin are just going to leave collagen molecules sitting on top of it, without penetrating it and therefore, without making any impact on your collagen production.

Studies & research around collagen

A number of studies showed improvement of skin and hair appearance by ingesting collagen, but those studies have been funded by companies which produce collagen. Supplement market remains largely unregulated, which raises questions around the reliability of the results of such studies. Collagen most of the time comes from bones and cartilages of cows, chicken and other animals – so the conditions in which those animals are kept can lack transparency.

There is a number of differing opinions, ranging from those claiming a finite amount of collagen in our bodies to those supporting the ability of our bodies to produce collagen again. In addition, digestive and cardiovascular systems and their interactions still remain unclear and inconclusive. While our body can produce collagen, this building process requires a number of building blocks whose consumption should be carefully supervised under the guidance of a qualified nutritionist.

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Collagen – hair loss link

While collagen deficiency itself may not be a direct cause of hair loss, it can contribute to weakened hair follicles and overall hair health, which can increase the risk of hair loss. Collagen plays a vital role in providing structural support and maintaining the integrity of various tissues in the body, including the hair.

Hair follicles are the structures from which hair grows. They require a healthy environment and proper nourishment to produce strong and vibrant hair strands. Collagen helps in maintaining the strength, elasticity, and thickness of the hair follicles. When there is a deficiency in collagen, the hair follicles may become weaker and more susceptible to damage and breakage.

Additionally, collagen is involved in promoting circulation and delivering essential nutrients and oxygen to the hair follicles. Insufficient collagen levels can compromise blood flow to the scalp, leading to inadequate nourishment of the hair follicles. This can result in the gradual miniaturization of the hair follicles and the production of weaker, thinner hair strands over time.

How to get collagen for hair growth

So if collagen pills, powder, shampoos and creams are not the way to top up your levels of collagen for hair growth. What is?

One of the core functions of collagen is to support and repair broken tissue. This is why microneedling your scalp for production of collagen is a better way to increase local production of collagen in your scalp.

By using a microneedling tool on your scalp, also known as a derma stamp or dermaroller – you create tiny wounds on your scalp: those wounds signalling your body that your it needs more collagen to repair them. This way your body sends extra collagen to where you want it – your hair follicles.

collagen supplements for hair growth
By using a microneedling tool you push your body to manufacture more collagen in your scalp, which strengthens your hair follicles.

In addition, this micro wounding process stimulates scalp blood flow – which is directly associated with hair health and accelerates hair regrowth, supporting your hair follicles to grow healthy hair. This way you naturally boost collagen for hair growth.

Building blocks of collagen

Important to remember if consuming collagen orally, your body breaks it down into amino acids first, releases them into blood stream and only then creates collagen. So your body needs other components for this process, without which, collagen molecules would not form.

Vitamin C

Vitamin C, or absorbic acid is essential to synthesis of lycine, glycine and proline amino acids – building blocks that make up collagen. This vitamin also acts as a stabilisator of the crosslinks of collagen mollecule.

Vitamin C can either be taken as a supplement, or via a balanced diet rich in dark leafy vegetables, like kale, broccoli and spinach. Contrary to the popular belief, oranges (53mg/100g) contain significantly lower amount of vitamins C compared to kale (120mg/100g) or broccoli (90mg/100g).

collagen supplements for hair growth

Daily recommended amount of vitamin C is 65-90mg a day. Therefore a small side of fresh broccoli or kale can help you reach your daily goal of vitamin C. Beware that high cooking temperatures break down vitamin C, therefore you are likely to attain better results by supplementing with this vitamin.


Iron, zinc and copper are all key in production of collagen. However you need to carefully monitor their intake, as overconsumption of either may cause mineral poisoning. In addition, absorption of some minerals is only possible when combined with specific vitamins or foods taken simultaneously:

Iron – advised to be taken with Vitamin C. Remember also drinking milk or consuming other dairy products reduces your body’s absorption of iron.

Zinc – phytate, which is present in staple foods like cereals, corn and rice inhibits absorption of Zinc. Casein, a protein found in milk and milk product also has a strong negative effect on zinc absorption. Therefore, avoid simultaneous consumption of phytate- and casein-rich foods when taking your zinc supplements. You best consume zinc from protein-rich foods: whether animal-based (organic and sustainably farmed meat, fish, poultry) or plant-based (organic beans, pulses, lentils, legumes).

Copper – best absorption of copper ensured by consuming with proteins whether animal or plant-based in origin.

Lysine and threonine are two of the essential amino acids that are necessary for collagen production. Your body doesn’t make these, so you should be getting those from foods like meats, poultry, fish, eggs, wheatgerm and beans, or nutritional supplements.

Loss of collagen

Now that we have covered the essentials of enabling your body to build its own collagen, here is a list of factors that contribute to lower levels of collagen and even its degradation. Degradation of collagen and reduction of its production are amongst reasons behind thinning hair, slower hair growth and hair loss:

collagen for hair growth
  • Stress – high levels of cortisol destroy collagen contained in dermis
  • Unbalanced diet and insufficient intake of vitamins
  • Ageing – our body naturally produce less collagen as we age
  • High amounts of sugar that causes inflammation in your body
  • Smoking
  • Ultraviolet rays

Appropriate levels of collagens are hard to achieve, especially in the high-stress environments we live in. Consumption of supplements and a balanced diet with organic and ethically-farmed produce will help boost your collagen production that could boost appearance of your hair.

Originally published in December 2018, updated July 2023.

Who we are:

The Hair Fuel is an all-natural hair growth mask created by Laura Sagen, who lost a third of her hair after a terrible visit to a hairdresser while suffering from a life-long condition of PCOS associated with androgenic hair thinning. She developed the formulation rooted in the science of scalp blood flow, which has become The Hair Fuel growth mask. Since then, her company has helped thousands of people like you to start growing healthy hair.

We work closely with our lab and manufacturers to ensure the highest quality product. But a product alone is never enough – so we hold your hand throughout your own, unique hair growth journey. Our flagship product, The Hair Fuel mask coupled with tailored advice, digital tools, and online support is there to help you grow the best hair you can. It’s a big claim – but we’re unafraid to make it. Check out our starter bundles >>


  • Mapping the Ligand-binding Sites and Disease-associated Mutations on the Most Abundant Protein in the Human, Type I Collagen, (1)
  • Induction of collagenolytic and proteolytic activities by anti-inflammatory drugs in the skin and fibroblast, (2)
  • Role of macrophages in collagen resorption during hair growth cycle, (3)
  • Dietary Factors Influencing Zinc Absorption, (4)
  • Dynamic ultrastructural changes of the connective tissue sheath of human hair follicles during hair cycle, (5)
  • Wikipedia on Collagen, (6)
  • Amino acid composition in determination of collagen origin and assessment of physical factors effects, International Journal of Biological Macromolecules, (7)
  • Dermal macrophage and its potential in inducing hair follicle regeneration, (8)
  • Immune modulation of hair follicle regeneration, (9)


  • 1. Does collagen really help hair growth?

    Not directly. Collagen plays an essential role in hair growth by lining up the inner sack of the hair follicle as well as keeping the dermis – layer of the skin from which a hair grows from, structurally sound, elastic and strong. Collagen does not directly prompt or accelerate hair growth.

  • 2. What type of collagen helps hair growth?

    Hair needs a balanced “cocktail” of amino acids to ensure structural integrity of skin and the hair follicle – from where a hair can grow from. While hydrolyzed collagen is absorbed easier, your body still breaks it down to amino acids and decides where to divert those building blocks to. Therefore focusing on a localised stimulation (e.g. dermarolling and improvement of scalp blood supply) supplemented by oral ingestion of collagen supplement is often recommended.

  • 3. Does collagen thicken hair?

    It is not that straightforward. A combination of internal and external stimulation of collagen production can help lining up the hair follicles which can contribute to growth of thicker hair – up to the maximum thickness your hair has had previously.

  • 4. How long does it take for collagen to work for hair growth?

    It depends if your body experiences a shortage of proteins elsewhere in your body. If your nutrition doesn’t bring sufficient protein to your body, supplementation of collagen will not lead to hair growth, but rather focus on repair of bones, ligaments and tendons first. Any significant changes in your hair health routine, including collagen supplementation should be observed over a period of at least 3-6 months to incorporate the natural timing of hair growth cycle.

  • 5. What does a scalp treatment do?

    Depending on the goals of your scalp treatment, it can help hair growth, treat dandruff including fungal infections. Scalp is made up of skin, so it can get affected by conditions affecting other parts of your body: e.g. eczema, fungal infections, psoriasis etc.

  • 6. Can collagen make your hair grow?

    Not directly. It is however important to consume sufficient amounts of amino acids, many of which (but not all) are present in collagen, to ensure your body receives sufficient amounts of building blocks to maintain healthy body, skin and hair and doesn’t experience shortages of it. In the event of a shortage, your hair usually suffers first – and recovers last.

  • 7. How much collagen should I take for hair growth?

    You should focus on taking a sufficient amount of protein per day, rather than focusing on collagen alone. A sedentary adult should consume 0.8 grams of protein per kilogram of body weight, or 0.36 grams per pound. Ensure you consume enough protein from varied sources. Note that hydroproxyline is only available through consumption of collagen and not available through other protein sources. Depending on your lifestyle and particular body needs (if you exercise regularly your muscle will require a higher amount of collagen, therefore increasing an overall need to have “leftover” for your hair. A 2.5-15mg daily dose appears to be safe and effective.

  • 8. Does collagen grow hair faster?

    Collagen doesn’t help accelerate hair growth. It lines up the hair follicle to support growth of healthy hair.

  • 9. What collagen is best for hair regrowth?

    Hydrolized collagen is easiest absorbed by your body.


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7 thoughts on “Collagen pills don’t improve hair growth and here is why<span class="wtr-time-wrap after-title"><span class="wtr-time-number">18</span> min read</span>”

  1. I have heard about collagen treatment for skin beauty. Thank you for sharing information on collagen pills for hair growth. The link and sources is also very helpful to understand why it is not working.

    • You can but it depends what type of collagen and you will need to make sure you combine it with scalp bloodflow improvement tools and not just rely on pills alone. It’s a lifestyle change.

    • Hey Well, I can see why you think the title is clickbait, but if you read the article you’d understand that collagen pills alone won’t improve the hair growth due to the way our body digests collagen, and the way it “interprets” collagen molecules when we do consume it. Without lifestyle-based changes to nutrition, and topical localised solutions which target scalp, the effect of these on hair growth is disproportionately small compared to the claims that collagen pills make. Majority of collagen pills also come with a hefty price-tag that I’d honestly urge you to send a “clickbait!!” message to their producers… If you were to explore collagen supplementation I would recommend hydrolised powdered collagen with correct RDAs of lycine, proline and glycine: as opposed to collagen pills – less processing and caking agents than pills, too.

      • Hey Teresa – thanks for the question! Hydrolysed collagen would lead to better absorption, and look out for the appropriate amounts of each amino acid – ensuring that RDA levels of proline, glycine and lycine are at least 80-100% if your diet is low in collagen / amino acids. Unsure if you meant hair loss as a result of dieting? When sticking to certain nutritional regimen, it’s important to consider your macros (carbs, fats, protein) as well as your micro-nutrients (vitamins, amindo acids). If your diet lacks these, your hair will show. Annoyingly, hair will improve last when you finally get your nutrition back on track, too. A bit of a bummer, but hair health is a litmus test of your overall health. To improve blood flow to scalp you are welcome to try our hair growth mask – The Hair Fuel that does exactly that – improves blood flow to scalp. (As well as other tools, such as derma roller and scalp massage – both can supplement your routine with our mask.)


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