Last updated: August 10, 2021

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Living healthy and happy into old age is a life goal in our society. Collagen makes up 30% of the proteins in the human body. It is an essential component for skin, bones, connective tissue and muscles as well as the function of many internal organs. Since the production of collagen in our body decreases with age, an additional supply through collagen powder is recommended. This way you can keep your body healthy and fit even in old age.

This comprehensive collagen powder test 2021 analyses the topic in detail and answers the most important questions. We explain what you should look out for before buying collagen powder. Based on scientific studies, we have worked out the positive and negative effects of collagen powder. With our health article, we want to help you find the right collagen powder for you.




The most important facts

  • Collagen is a very valuable structural protein of all living organisms. It is found in skin, hair, cartilage, tendons, eyes, teeth, joints and many internal organs.
  • Collagen powder is obtained from animal raw materials. Chicken, pigs, cattle or fish are the main sources of collagen production.
  • Collagen powder is often used for anti-aging purposes to tighten the skin and connective tissue. Collagen powder can also be very helpful for joint pain or many diseases.

The Best Collagen Powder: Our Picks

Buying and evaluation criteria for collagen powder

When buying collagen powder, you should pay attention to the following aspects:

These buying and evaluation criteria are described in more detail in the next sections. Because by making the right choice for you, you save money and ensure that you only give your body what it really needs.

Ingredients

Collagen powder differs greatly in its ingredients. Each ingredient has a unique effect on the body. Therefore, before buying collagen powder, you should know which ingredients you need to create a certain effect. The higher and purer the proportion of collagen powder, the better and faster effects can be achieved. Collagen powder is basically derived from animals. The most common sources of raw materials are:

  • Fish
  • Cattle
  • Chickens
  • Pigs

Collagen hydrolysate is often obtained from pork rind, as it is the cheapest way to produce collagen powder. However, production from fish tissue or bovine split is also common. Cheap collagen hydrolysate is often produced in factory farms. Here, however, the animals are often treated with antibiotics. Therefore, you should pay attention to the production and prefer pasture farming.

Did you know: There are also vegan, plant-based collagen powders. These are not pure collagen, as plants do not contain collagen. These are pure food supplements and stimulate the collagen synthesis in our body.

Dosage

The dosage of collagen powder varies depending on the ingredients as well as the manufacturer. Most of the time, the daily amount is prescribed on the packaging. In addition, the dosage of collagen powder depends on your age, body and medical condition. Therefore, it is advisable to get an opinion from a doctor.

10 to 15 g of collagen powder daily is optimal.

Low dosages are ideal for patients who use collagen powder for beauty purposes, as an anti-ageing product. Younger people should also take a lower dosage. Because up to the age of 25 you still have a good and natural collagen production. Therefore, a high dosage would be superfluous.

Are you older and do you suffer from osteoporosis or rheumatism? Then you should take a larger amount of collagen powder. However, an overdose is almost impossible and not harmful to the body. The excess of collagen powder is merely superfluous as no greater effect is achieved. Nevertheless, the daily dosage should be adapted to your individual body and circumstances.

Quality

The quality of collagen powder is very important. Therefore, the ingredients play a major role. A good collagen preparation should not contain any unnecessary additives or preservatives such as artificial flavours or sugar. This is because they slow down the effect of collagen.

You can also prevent additional harmful substances from entering your body. This also reduces the risk of possible intolerances

Furthermore, the origin says a lot about the quality of the collagen powder. Depending on how the animals are kept and fed, the quality of the powder also differs. Raw materials obtained from animals from factory farms are of lower quality than those from pasture-raised animals. In the case of fish, you can check whether the raw material comes from a sustainable catch, as these are labelled with seals. To be really sure of the quality of the collagen powder, ask the manufacturer for certificates before buying.

Additives

Collagen powders often contain additives such as biotin, elastin, hyaluronic acid or vitamin C, among others. Before buying a collagen powder, it is important to read through all the additives on the packaging. Each additive has its own effect.

Which additives you need depends on your body and your circumstances. Therefore, choose a collagen powder with additives that suits you and your needs.

Do you suffer from osteoporosis? Then a pure collagen powder without additives is more effective and recommended. Do you want to smooth out small wrinkles in your skin? Then additives such as hyaluronic acid or elastin can additionally strengthen skin tightening. Pure collagen is soy, gluten and lactose free. Additives often contain egg or soy. Do you suffer from intolerances to these foods? Then you should read all the ingredients on the packaging carefully.

Packaging

Collagen powder comes in a wide variety of packaging - large or small. You can buy collagen powder in plastic or glass jars as well as in paper bags. The colour and design of the packaging varies depending on the manufacturer. Are you not familiar with collagen powder and have never tried it? Then you should try a smaller 200g package. If you have often tried different collagen products, you can also buy a 1 kg box. The larger packages are usually cheaper in terms of price and performance.

Guide: Questions you should ask yourself before buying collagen powder

In order to inform you comprehensively about the effectiveness of collagen powder and to give you an understanding of the current state of science, we have summarised all the important information in the following sections.

What is collagen and how is it made into powder?

Collagen is made up of individual proteins also known as the amino acids proline, lysine and glycine. It is a structural protein that makes up 30% of the total body protein in living beings and holds the body together. (1) Due to the molecular structure of collagen, the protein has a high tensile and elongation capacity.

It is mainly found in the skin, joints, bones, cartilage, tendons and teeth and gives stability and cohesion. (1) Collagen is extracted from the skin and bones of pigs, cattle and chickens, as well as from the scales and flesh of fish. These raw tissues are then further processed into collagen hydrolysate or gelatin.

Kollagen Pulver-01

Collagen hydrolysate is nowadays often obtained from cattle. This is because the collagen powder obtained from it is very tasteless. Therefore, you can take the collagen powder with drinks or food.
(Image source: Max Saeling/ unsplash)

Collagen hydrolysate is collagen in a powder form. This dissolves well in water and is readily usable by the human body. The powder is produced by an enzymatic hydration of animal collagen. This process happens as follows:

  1. Raw tissue is treated in an alkaline or acidic process and made soluble in water.
  2. Collagen is purified with hot water.
  3. Collagen is extracted.
  4. Collagen is dried.

What effect does collagen powder have?

Collagen powder is used in the beauty industry as well as to treat diseases. Each type of collagen has a different effect on our body. The most common effects collagen powder has on:

  • Skin
  • Joints and bones
  • Stomach and intestine
  • Sleep

Collagen usually takes effect in the body immediately after ingestion. The first improvements can already be seen after a few days to a month at the latest. However, collagen powder should be taken regularly over a period of at least half a year.

Skin

According to clinical studies, oral collagen intake over a period of 6 months has shown noticeable results in the skin of patients. A daily dose of 2.5 to 10 g of collagen powder has been sufficient to boost skin hydration and reduce wrinkles.

In addition, there is an increased collagen density in the skin (2, 3) Another study confirms that collagen supplementation tightens the skin. Therefore, collagen has an anti-aging effect on the skin and connective tissue. (4) In other patients, even cellulite improved over a longer period of time. A daily intake of 2.5 g collagen powder per day showed significant improvements in skin density (5)

Joints and bones

Cartilage tissue can be treated with collagen. Studies at the University of Kiel have shown that cartilage is newly formed through regular collagen supplementation. Oral supplementation can therefore promote cartilage formation (6)

The joint disease osteoarthritis is characterised by cartilage degradation. This can be accompanied by severe pain

A study showed pain relief in osteoarthritis patients after only a short time of ingestion of collagen. Therefore, collagen also helps to reduce the pain of osteoarthritis. (7) Collagen also helps osteoporosis patients. This is a disease in which the bone structure is disturbed and reduced. A study has shown that oral collagen supplementation builds up bone tissue and thus stops bone loss.

In addition, the supply of collagen accelerates the healing of bone fractures. It can therefore be concluded that collagen improves the overall bone structure (8) Furthermore, collagen has also been shown to have an effect on rheumatism sufferers. A daily intake of this preparation helped some rheumatism patients to reduce the sensitivity as well as the swelling of the joints. As a result, the use of painkillers could be reduced. (9)

Stomach and intestines

More and more people are suffering from stomach or intestinal disorders. Scientific studies have investigated the intake of collagen and its effect on the gastrointestinal tract. It was shown that collagen protects and repairs the mucous membrane as well as the intestinal cells. Therefore, collagen also has a positive effect on the intestinal flora (10, 11) Collagen has also been shown to be helpful for our digestive system. The amino acids in collagen protect the cell membrane and the stomach lining. This inhibits inflammation and promotes natural digestion (12)

Sleep

Collagen can improve our sleep. It has been scientifically proven that collagen peptides improve the quality of sleep. In addition, the concentration on the next day could be increased (10, 13)

When and for whom is it useful to take collagen powder?

You should take collagen powder together with a little liquid either with a meal or after physical activity. Especially after sports, the body absorbs nutrients better and faster. When you should start taking collagen powder depends on your age and your life situation. The body usually produces enough collagen up to the age of 25.
The collagen content decreases by about 1 percent per year.

After 25, the production of collagen in the body is reduced and continues to decrease with age.

Over time, our skin becomes thinner, wrinkled and drier (14, 15) You can counteract the ageing process by increasing the concentration of collagen in the body through dietary supplements. However, you should take a lower dosage when you are 25 than when you are 70. The older you get, the stronger the dosage should be.

Kollagen Pulver-02

Collagen combined with hyaluronic acid makes your skin look younger and firmer. An effect is already visible after a few weeks.
(Image source: Freestocks/ unsplash)

Collagen powder is not only suitable for beauty treatment, but also for various diseases. So do you suffer from skin problems, arthritis, osteoporosis or rheumatism? Then collagen supplements are ideal for you. Caution: Environmental factors such as smoking or high sun exposure can slow down collagen growth.

What types of collagen powder are there and which one suits me?

Collagen comes in a total of 28 types and can have different effects. Types I, II and II are the most common.

Collagen type area
Type I skin, fascia, bones, ligaments, tendons and vessels
Type II elastic, hyaline and fibrous cartilage
Type III heart, skin, blood vessels, internal organs and reticular connective tissue

Type 1 is most abundant in our bodies. It is found in skin, fascia, bones, ligaments, tendons and vessels. It forms a structure and strengthens these organs. The protein tightens the skin as well as the cells and is therefore often used as an anti-ageing product (16)

Collagen type 2 is found in elastic, hyaline and fibrous cartilage and is needed for our eyes. It is also considered a structural protein and ensures the mobility of cartilage in the body. Therefore, collagen powder from this type is particularly helpful for arthritis diseases or joint complaints.

Type 3 is often found in reticular connective tissue and elastic tissue. You will find these collagens throughout the skin, heart, blood vessels and cartilage. They give your body a certain elasticity.

How much collagen does the body need?

It is difficult to say how much collagen the body needs, as the dosage varies greatly. It depends on your age and your body. In general, your body still produces enough collagen up to the age of 25. Therefore, collagen intake is unnecessary under the age of 25. Tailor the dose of collagen to you and your needs. People who have poor connective tissue, wrinkled skin or suffer from joint and bone diseases need a higher dose than people in good health.

Kollagen Pulver-03

Almost 60 percent of all Germans suffer from joint pain. Collagen powder can help relieve pain and stimulate cartilage formation.
(Image source: Anna Auza/ unsplash)

The general guideline is 10 to 15 g of collagen powder a day. The exact dosage is usually stated on the product's package insert. Alternatively, you can get tips and recommendations from a doctor or sports physician. A study with animals showed that even a strong overdose of collagen peptides had no toxic effects. Too much collagen just doesn't have a positive effect on your body (17)

What are the side effects of collagen powder?

According to previous studies, no side effects were found with a daily dose of about 10 g of collagen. Therefore, these preparations can be recommended without any problems. (2, 8) In rare cases, however, taking collagen can lead to skin rashes, as confirmed by a study. (18) In general, you should try a new collagen powder for a few days first to avoid intolerances. If you tolerate the product well, then you can continue to take it without any problems.

How much does collagen powder cost?

The price of collagen powder varies greatly depending on the manufacturer, the ingredients and the quantity. As a rule, prices vary between €15 and €50. You can get good and highly dosed products for as little as 20 €. Collagen powder is sold in 250g but also in 1000g packages. You can get 500g tins or sachets for as little as €15. Usually larger sizes are proportionally cheaper. Have you already tried a collagen product and had a good experience with it? Then it is worth buying a larger pack.

Are there other forms of collagen besides powder?

Collagen is available in different product forms. In addition to collagen powder, the following products are also popular:

  • Collagen Capsules
  • Collagen Creams
  • Collagen Drinks

Collagen capsules

Collagen is available in capsules. With this product, the daily dosage is already contained in one capsule. In addition, capsules are neutral in taste and smell compared to powder and are suitable for everyday use. You can easily take collagen capsules with you wherever you go.

Advantages
  • Already dosed
  • Neutral taste and smell
  • Suitable for everyday use
Disadvantages
  • More uncomfortable to take
  • liquid required
  • delayed effect

However, taking tablets is more unpleasant than taking powder, because you have to swallow the tablets. So do you have trouble swallowing? Then collagen capsules are not recommended. In addition, you always need liquid to take the capsules and the effect is often delayed. This is because the capsules first have to dissolve in the stomach.

Collagen creams

Collagen creams, on the other hand, moisturise and tighten the skin directly on the area to be treated. Especially after UV radiation, the skin is heavily stressed and ages. The application of after-sun creams with collagen content helps to strengthen the connective tissue and reduce the formation of wrinkles. In addition, collagen creams are available in different scents.

Advantages
  • Direct effect in the right place
  • Moisturising for the skin especially after sun exposure
  • Different scents available
Disadvantages
  • Only effective in one place
  • Greasy skin
  • Time-consuming

However, collagen creams only work in one spot. In addition, the application of the collagen cream can make the skin look greasy. It can also take some time for the cream to be absorbed into the skin. Therefore, using collagen creams is more time-consuming than taking collagen in powder or capsule form.

Collagen drinks

Collagen drinks are very easy to take. This is because taking collagen drinks in liquid form is not only very quick, but also pleasant. This means you can avoid swallowing difficulties. Moreover, no additional liquid is needed.

Advantages
  • Easy, fast and pleasant to take
  • no additional liquid intake necessary
Disadvantages
  • Usually more expensive
  • Effect usually not as effective

The disadvantage of collagen drinks is that they are usually more expensive than other collagen products. In addition, the effect of the collagen is usually not as effective as with capsules or creams.

What are the alternatives to collagen powder?

A healthy diet is an alternative to collagen powder. Many foods contain nutrients that support collagen production in the body. They are not a direct substitute for collagen powder, but they do support its production.

Food group Food Nutrients
Orange fruits and vegetables Apricots, mango, carrots and sweet potatoes Vitamins A and C
Red fruits and vegetables Cherries, strawberries, red peppers and beetroot Amino acids Lycopene
Oils Linseed oil Omega-3 fatty acids
Seeds and nuts Chia seeds, goji berries, almonds, walnuts and cashews Rich in various amino acids and fibre

A good source is, for example, vegetables and fruit. Red fruits and vegetables such as cherries, strawberries, red peppers or beetroot contain the amino acid lycopene, which stimulates collagen production in the body. Orange fruits and vegetables like apricots and mango or carrots and sweet potatoes have a lot of vitamin C and stimulate cell growth. They therefore serve as building material for collagen production.

Linseed oil is also an absolute collagen buster. This is because it has a very high omega-3 fatty acid content and is responsible for cleansing the body. The antioxidant effect of linseed oil inhibits the breakdown of collagen in the body's cells

Furthermore, seeds and nuts are rich in many amino acids and dietary fibres. Chia seeds have particularly diverse amino acids. Together with liquid, chia seeds mix to form a kind of gel in the body. This not only promotes collagen production, but also digestion and protects the intestinal flora.

Kollagen Pulver-04

Did you know how healthy and protein-rich seeds and nuts are? They get muscle cells as well as nerves going and provide our body with vital energy.
(Image source: Maddi Bazzocco/ unsplash)

However, absorption through supplements such as collagen powder is quicker for the body to absorb than through food. This is because the powder can be broken down into small peptides and easily absorbed by the body. The proteins in food are first broken down into amino acids and then reassembled. When eating food, the body has to build its own collagen structure from the many amino acids. This process can take a little longer.

Image source: imagepocket/ 123rf.com

References (18)

1. Wehner, R. and Gehring, W. (2007). Zoologie. Georg Thieme Verlag: Zürich.
Source

2. Choi, F.D., et al. 2019. Oral Collagen Supplementation: A Systematic Review of Dermatological Applications. J Drugs Dermatol.18(1):9-16
Source

3. Proksch, E., et al. 2014. Oral intake of specific bioactive collagen peptides reduces skin wrinkles and increases dermal matrix synthesis. Skin Pharmacol Physiol.27(3):113-119.
Source

4. Bolke L, Schlippe G, Gerß J, Voss W. A Collagen Supplement Improves Skin Hydration, Elasticity, Roughness, and Density: Results of a Randomized, Placebo-Controlled, Blind Study. Nutrients. 2019 Oct 17;11(10):2494.
Source

5. Schunck, M., et al. 2015. Dietary Supplementation with Specific Collagen Peptides Has a Body Mass Index-Dependent Beneficial Effect on Cellulite Morphology. J Med Food. 18(12):1340-1348.
Source

6. Oesser, S., & Seifert, J. (2003). Stimulation of type II collagen biosynthesis and secretion in bovine chondrocytes cultured with degraded collagen. Cell and tissue research, 311(3), 393–399. https://doi.org/10.1007/s00441-003-0702-8
Source

7. Liu, X. 2016. Dietary supplements for treating osteoarthritis: a systematic review and meta-analysis. Br J Sports Med.52(3):167-175.
Source

8. Daneault, A., et al. 2017. Biological effect of hydrolyzed collagen on bone metabolism. Crit Rev Food Sci Nutr.57(9):1922-1937
Source

9. Moskowitz R. W. (2000). Role of collagen hydrolysate in bone and joint disease. Seminars in arthritis and rheumatism, 30(2), 87–99.
Source

10. Razak, M. A., Begum, P. S., Viswanath, B., & Rajagopal, S. (2017). Multifarious Beneficial Effect of Nonessential Amino Acid, Glycine: A Review. Oxidative medicine and cellular longevity, 2017, 1716701.
Source

11. Samonina, G., et al. 2000. Protection of gastric mucosal integrity by gelatin and simple proline-containing peptides. Pathophysiology 7:69–73
Source

12. Zhong Z, Wheeler MD, Li X, et al. L-Glycine: a novel antiinflammatory, immunomodulatory, and cytoprotective agent. Curr Opin Clin Nutr Metab Care. 2003;6(2):229-240.
Source

13. Bannai, M., Kawai, N., Ono, K., Nakahara, K., & Murakami, N. (2012). The effects of glycine on subjective daytime performance in partially sleep-restricted healthy volunteers. Frontiers in neurology, 3, 61.
Source

14. (Varani J, Dame MK, Rittie L, et al. Decreased collagen production in chronologically aged skin: roles of age-dependent alteration in fibroblast function and defective mechanical stimulation. Am J Pathol. 2006;168(6):1861-1868.
Source

15. Dumas M, Chaudagne C, Bonté F, Meybeck A. In vitro biosynthesis of type I and III collagens by human dermal fibroblasts from donors of increasing age. Mech Ageing Dev. 1994;73(3):179-187.
Source

16. Wu M, Cronin K, Crane JS. Biochemistry, Collagen Synthesis. [Updated 2020 May 4]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2020 Jan-.
Source

17. Marone PA, Lau FC, Gupta RC, Bagchi M, Bagchi D. Safety and toxicological evaluation of undenatured type II collagen. Toxicol Mech Methods. 2010 May;20(4):175-89.
Source

18. Niinimäki A., et al. 1998. Contact urticaria from protein hydrolysates in hair conditioners. Allergy. 53(11):1078-1082
Source

Why you can trust me?

Zoologie
Wehner, R. and Gehring, W. (2007). Zoologie. Georg Thieme Verlag: Zürich.
Go to source
Oral Collagen Supplementation: A Systematic Review of Dermatological Applications
Choi, F.D., et al. 2019. Oral Collagen Supplementation: A Systematic Review of Dermatological Applications. J Drugs Dermatol.18(1):9-16
Go to source
Oral intake of specific bioactive collagen peptides reduces skin wrinkles and increases dermal matrix synthesis
Proksch, E., et al. 2014. Oral intake of specific bioactive collagen peptides reduces skin wrinkles and increases dermal matrix synthesis. Skin Pharmacol Physiol.27(3):113-119.
Go to source
Collagen Supplement Improves Skin Hydration, Elasticity, Roughness, and Density: Results of a Randomized, Placebo-Controlled, Blind Study
Bolke L, Schlippe G, Gerß J, Voss W. A Collagen Supplement Improves Skin Hydration, Elasticity, Roughness, and Density: Results of a Randomized, Placebo-Controlled, Blind Study. Nutrients. 2019 Oct 17;11(10):2494.
Go to source
Dietary Supplementation with Specific Collagen Peptides Has a Body Mass Index-Dependent Beneficial Effect on Cellulite Morphology
Schunck, M., et al. 2015. Dietary Supplementation with Specific Collagen Peptides Has a Body Mass Index-Dependent Beneficial Effect on Cellulite Morphology. J Med Food. 18(12):1340-1348.
Go to source
Stimulation of type II collagen biosynthesis and secretion in bovine chondrocytes cultured with degraded collagen
Oesser, S., & Seifert, J. (2003). Stimulation of type II collagen biosynthesis and secretion in bovine chondrocytes cultured with degraded collagen. Cell and tissue research, 311(3), 393–399. https://doi.org/10.1007/s00441-003-0702-8
Go to source
Dietary supplements for treating osteoarthritis: a systematic review and meta-analysis
Liu, X. 2016. Dietary supplements for treating osteoarthritis: a systematic review and meta-analysis. Br J Sports Med.52(3):167-175.
Go to source
Biological effect of hydrolyzed collagen on bone metabolism
Daneault, A., et al. 2017. Biological effect of hydrolyzed collagen on bone metabolism. Crit Rev Food Sci Nutr.57(9):1922-1937
Go to source
Role of collagen hydrolysate in bone and joint disease
Moskowitz R. W. (2000). Role of collagen hydrolysate in bone and joint disease. Seminars in arthritis and rheumatism, 30(2), 87–99.
Go to source
Multifarious Beneficial Effect of Nonessential Amino Acid, Glycine: A Review
Razak, M. A., Begum, P. S., Viswanath, B., & Rajagopal, S. (2017). Multifarious Beneficial Effect of Nonessential Amino Acid, Glycine: A Review. Oxidative medicine and cellular longevity, 2017, 1716701.
Go to source
Protection of gastric mucosal integrity by gelatin and simple proline-containing peptides
Samonina, G., et al. 2000. Protection of gastric mucosal integrity by gelatin and simple proline-containing peptides. Pathophysiology 7:69–73
Go to source
L-Glycine: a novel antiinflammatory, immunomodulatory, and cytoprotective agent
Zhong Z, Wheeler MD, Li X, et al. L-Glycine: a novel antiinflammatory, immunomodulatory, and cytoprotective agent. Curr Opin Clin Nutr Metab Care. 2003;6(2):229-240.
Go to source
The effects of glycine on subjective daytime performance in partially sleep-restricted healthy volunteers
Bannai, M., Kawai, N., Ono, K., Nakahara, K., & Murakami, N. (2012). The effects of glycine on subjective daytime performance in partially sleep-restricted healthy volunteers. Frontiers in neurology, 3, 61.
Go to source
Decreased collagen production in chronologically aged skin: roles of age-dependent alteration in fibroblast function and defective mechanical stimulation
(Varani J, Dame MK, Rittie L, et al. Decreased collagen production in chronologically aged skin: roles of age-dependent alteration in fibroblast function and defective mechanical stimulation. Am J Pathol. 2006;168(6):1861-1868.
Go to source
In vitro biosynthesis of type I and III collagens by human dermal fibroblasts from donors of increasing age
Dumas M, Chaudagne C, Bonté F, Meybeck A. In vitro biosynthesis of type I and III collagens by human dermal fibroblasts from donors of increasing age. Mech Ageing Dev. 1994;73(3):179-187.
Go to source
Biochemistry, Collagen Synthesis
Wu M, Cronin K, Crane JS. Biochemistry, Collagen Synthesis. [Updated 2020 May 4]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2020 Jan-.
Go to source
Safety and toxicological evaluation of undenatured type II collagen. Toxicol Mech Methods
Marone PA, Lau FC, Gupta RC, Bagchi M, Bagchi D. Safety and toxicological evaluation of undenatured type II collagen. Toxicol Mech Methods. 2010 May;20(4):175-89.
Go to source
Contact urticaria from protein hydrolysates in hair conditioners
Niinimäki A., et al. 1998. Contact urticaria from protein hydrolysates in hair conditioners. Allergy. 53(11):1078-1082
Go to source
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