Consuming protein is not only great for the muscles, but it also benefits your hair growth. Hair strands consists of keratin, a type of protein, but you need to ensure you consume the right amino acids – the building blocks of the protein – in order to grow healthy hair. In this article, we will first look at the biology and hair structure, understand what is an "essential" vs "non-essential" amino acids, what happens to your hair when there is shortage of protein and how you can tackle protein shortage to nourish your hair follicles for developing strong roots and hair.
/wp:paragraph wp:headingBiology of protein in hair structure
/wp:heading wp:paragraphThere are two types of protein present in your hair – one throughout your hair lengths, and another – at the root of your hair.
/wp:paragraph wp:generateblocks/headline {"uniqueId":"1831af68","element":"h4","blockVersion":3}Protein in hair lengths
/wp:generateblocks/headline wp:paragraphYour hair strands consist of protein, called "keratin", and keratin consists of amino acids – organic compounds which your body breaks down from the protein you consume. When taken through supplements or as part of your diet and nutrition, your body identifies areas of amino acid shortage and decides which areas need a top up. It may not always go to your hair, even though it may be your preferred area of protein focus.
/wp:paragraph wp:generateblocks/headline {"uniqueId":"beaeb0cc","element":"h4","blockVersion":3}Protein in your hair roots
/wp:generateblocks/headline wp:paragraphAnother part of your hair where a type of protein is present – is the inner lining which has molecules of collagen. During growth stage of hair (anagen), your hair follicle has increased amount of collagen in the lining of the hair bulb.
/wp:paragraph wp:paragraphBecause hair growth and hair health is on the lower list of priorities, especially in situations of hormonal imbalance or periods of high stress, your hair will suffer first if there is a shortage of protein and amino acids. As a result, low protein levels can lead to breakage in hair and slow hair growth simply because your body lacks those building blocks.
/wp:paragraph wp:paragraphIn addition lack of protein in your diet can lead to hair loss if your body de-prioritises hair health further, in favour of supporting more life-supporting functions in your body.
/wp:paragraph wp:headingWhy protein is important to hair growth?
/wp:heading wp:paragraphYour hair consists of 85-90% keratin – a complex protein that also makes up majority of your skin and nails. In turn, keratin is built up by 18 essential and non-essential acids.
/wp:paragraph wp:paragraphLet's look at the difference between an essential vs non-essential amino acid in the context of hair:
/wp:paragraph wp:list- A "non-essential" amino acid is the one that your body can produce itself – from other amino acids you consume as food or supplements. In hair growth, cysteine is a non-essential amino acid, necessary for construction of hair. Cysteine is metabolised from methionine – which is an "essential" amino acid.
- An “essential” amino-acid is the one your body can't naturally produce and needs. To manufacture cysteine, your body needs an external intake of methionine.
Shortage of protein can stunt hair growth
/wp:generateblocks/headline wp:paragraphIf protein levels are too low, the protein that you consume goes to life-supporting functions: such as muscular-skeletal and cardiovascular systems – rather than hair growth. Thus, in case of an on-going protein deficiency, body curbs amino acids sent for hair growth and hair follicles, in favour of making sure that your body can still build and support muscles and tendons. This leads to poor hair health, hair breakage, stunted hair growth and hair loss as result of shortened phase of anagen (growth stage of hair).
/wp:paragraph wp:paragraphShort-term protein shortages are acceptable, but a balanced diet for hair growth supplemented with vitamins and amino acids is what would uphold your long-term hair health.
/wp:paragraph wp:paragraphSome vitamins (e.g. vitamin B1) is essential to metabolise the protein you consume into the amino acids your hair needs. And, since the vitamin density and content in our food has decreased dramatically over the last 100 years, supplementation becomes ever more important and diet alone would be insufficient for healthy hair growth.
/wp:paragraph wp:heading {"level":3}Keratin is the protein which makes up hair, but what else?
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Hair shaft consists of 3 different types of bonds: hydrogen, salt (saline) and disulphide bonds.
/wp:paragraph wp:paragraphHydrogen bonds allow our hair to change shape temporarily and produces a flexible hold. An example of that would be a blow dry, curling or straightening your hair with a heat styling tool.
/wp:paragraph wp:paragraphSalt (saline) bonds are responsible for hair's strength and a consistent percentage of hair's elasticity. They are created between the positive end of one amino acid chain and the negative end of another. Which is why they are also known as "ionic" bonds in hair. Like hydrogen bonds, these are also temporary and weaker bonds which also are normally broken by water or heat.
/wp:paragraph wp:paragraphDisulphide bonds are stronger and more permanent, thus requiring strong chemicals to break them. For example in chemical perms a strong chemical – ammonium thioglycolate – is used to break those disulphide bonds that leads to permanent change in hair structure.
/wp:paragraph wp:paragraphHair shafts with missing molecules of keratin often lack lustre and are prone to breakage, because broken disulphide bonds within the hair shaft weaken the shaft.
/wp:paragraph wp:generateblocks/headline {"uniqueId":"6aee8206","element":"h3","blockVersion":3}What keratin in hair is made of?
/wp:generateblocks/headline wp:paragraphKeratin is high in sulphur, the largest component of the disulphide bonds. Sulphur in hair is made up from cysteine, which is replenished through a healthy diet rich in methionine to manufacture it – and some supplementation. Low amounts of methionine, and therefore lack of sulphur can lead to thinning hair and especially hair breakage, and - as a result of it - split ends.
/wp:paragraph wp:paragraphDisulphide bonds are further nourished by natural hair products, gentle styling and hair care methods.
/wp:paragraph wp:headingFood sources of protein for hair
/wp:heading wp:paragraphYour digestive system breaks down proteins into amino acids that then get diverted into liver to produce more protein in the form that your body requires. Whether it is the muscle tissue or keratin structures in your hair, your body needs to consume enough protein in order to break them into amino acids to create necessary building blocks.
/wp:paragraph wp:paragraphSince some key amino acids are not directly produced by your body, you need to supplement it with balanced nutrition or with amino acid supplements. Taking into the necessary amount of protein (roughly 0.8g per kilo of weight), so that body can regulate itself and decide which type of amino acid it needs to produce – is a good start.
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Protein digestion and hair growth
/wp:generateblocks/headline wp:paragraphThere is a significant overlap in the type of foods that can top up your levels of protein and amino acids to help your hair growth. But increasing levels of protein alone, isn't enough and you need to ensure you supplement it with vitamins and appropriate levels of fibre.
/wp:paragraph wp:paragraphPlant-based protein sources though already containing a number of micronutrients and vitamins, need to be supplemented with vitamin B12, vitamin D, the omega-3 fatty acid DHA, iron and zinc – for them to be successfully metabolised into amino acids.
/wp:paragraph wp:paragraphWhile you can get those partially from the foods you eat, taking supplements would ensure you meet your daily recommended dose. If you are keen to get these from the food alone you need to be mindful of some vitamins reacting or even being destroyed by heat. For example to support your iron intake it helps to combine your cooked spinach (naturally rich in iron) with vitamin C-rich broccoli. Both will also contribute to your uptake of fiber necessary to keep body & scalp inflammation at bay.
/wp:paragraph wp:paragraphLet's look at two groups of keratin-associated proteins that are high in the amino acids: cysteine and glycine. Both being the building blocks of this critical protein for hair growth:
/wp:paragraph wp:heading {"level":3}Cysteine
/wp:heading wp:paragraphCysteine is, inarguably, the most crucial of amino acids for hair growth. It establishes disulphide bonds in hair. In a number of clinical studies, diets supplemented with cysteine reduced hair loss in subjects over the period of 6 months.
/wp:paragraph wp:paragraphBest food sources of Cysteine: Your body can manufacture cysteine from methionine, an essential amino acid. The major dietary sources of methionine include eggs, beef liver, broccoli, wheat germ, Brussels sprouts, and some dairy products like milk and yogurt. Daily RDA of methionine for an adult of 68kg weight is 1.1g.
/wp:paragraph wp:heading {"level":3}Glycine and collagen
/wp:heading wp:paragraphGlycine is one of the main building blocks of collagen, the most abundant protein in your body. Collagen is important for hair growth because it lines the hair follicle supporting the anagen (growth) stage of your hair.
/wp:paragraph wp:paragraphWhile ingesting collagen isn’t the direct way to top up the levels of collagen in your hair, supplementing your diet with the building blocks: vitamin C and glycine – can provide strength for your muscles, skin, cartilage, blood, bones, ligaments - and hair. Another way to manufacture collagen locally on your scalp is through dermarolling.
/wp:paragraph wp:paragraphCollagen production also needs support of proper hydration – therefore drinking sufficient amounts of water for hair growth (at least 2.7 litres for women, and 3.7l for men per day) is essential for production of collagen in your skin and scalp.
/wp:paragraph wp:paragraphBest food sources of Glycine: since glycine is a non-essential amino acid, your body can manufacture it. To supply the building blocks for it, consume foods dairy products – greek yoghurt, certain cheeses (parmesan, mozzarella), seeds – especially sesame seeds, lean turkey, soybeans. Daily RDA of glycine is 2-5g.
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Keratin treatments
/wp:heading wp:paragraphThe process of keratin treatment involves artificially adding keratin to the hair shaft. First, it starts with opening the hair cuticle to make it susceptible to the absorption of keratin. Then, it follows with ingesting the hair shaft with keratin and sealing it back for smoothness, manageability and shine.
/wp:paragraph wp:paragraphThough this process can visibly “repair” a damaged hair shaft, it often involves using harsh chemicals such as formaldehyde and high temperatures for sealing and therefore cannot be recommended as an on-going way to support hair health.
/wp:paragraph wp:paragraphAs tempting as it this "fix" sounds, a more sustainable way to top up your keratin levels comes from within. Think balanced nutrition with necessary amount of whole proteins supplemented with key aminos: cysteine and glycine as building blocks of keratin within your hair follicle.
/wp:paragraph wp:paragraphIf you want to understand nutrition to support your hair health, here >> you can find out specific foods to eat in order to grow your hair.
/wp:paragraph wp:headingTopical (on-scalp) solutions
/wp:heading wp:paragraphThe best support for hair growth needs to combine external and internal methods. As you incorporate more proteins into your diet, you need to look into natural products available on the market, specifically those focusing on the blood flow to scalp to ensure that the proteins you consume and the amino acids produced by your body get delivered to the point they need to be which is your scalp. Read more here >>
/wp:paragraph wp:block {"ref":19495} / wp:heading {"level":4}Sources:
/wp:heading wp:paragraphOrganization and expression of hair follicle genes, Journal of Investigative Dermatology (1)
/wp:paragraph wp:paragraphThe structure of people’s hair (2)
/wp:paragraph wp:paragraphEffects of the Usage of l-Cysteine (l-Cys) on Human Health (3)
/wp:paragraph wp:paragraphVitamin C and amino acid metabolism (4)
/wp:paragraph wp:paragraphIn Vitro Differences Between Keratinocyte Stem Cells and Transit-Amplifying Cells of the Human Hair Follicle (5)
/wp:paragraph wp:paragraphSulphur content of hair and of nails in abnormal states (6)
/wp:paragraph wp:paragraphSulphur-containing Amino Acids: Protective Role Against Free Radicals and Heavy Metals (7)
/wp:paragraph wp:paragraphThe sulfur-containing amino acids: an overview (8)
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