Primal Multi Collagen

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$29.95 $22.46
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MULTI COLLAGEN FORMULA WITH ALL 5 ESSENTIAL TYPES

Supports hair, skin, nails, joints, and gut health

Features all 5 essential collagen types (I, II, III, X, and V)

Food-derived hydrolyzed collagen from 4 premium sources (bovine, chicken, eggshell membrane, and fish collagen)

Easy-to-swallow capsules with no unpleasant tastes or smells

Sustainably sourced and made without gluten, dairy, or soy

USA-made in our GMP-certified facility*

ORDER TODAY TO RECEIVE AFREE immune-boosting recipe e-book ($14.95 value)

For questions or phone orders call: 631-769-2227


FREE SHIPPING ON
ORDERS OF $75 OR MORE

ORDERS BY 3PM SHIP SAME DAY

(MON-FRI)*

90-DAY MONEY-BACK
GUARANTEE

MADE
IN THE USA*


6 CORE BENEFITS OF OUR

MULTI COLLAGEN CAPSULES


PROMOTES HEALTHY, GLOWING SKIN

This Multi Collagen formula supports healthy skin from within and may enhance skin elasticity, minimize fine lines and wrinkles, boost hydration, and promote vibrant skin for a youthful, glowing complexion.

ALL THE BENEFITS
OF COLLAGEN

Formulated with the ultimate blend of all 5 essential collagen types, our Multi Collagen capsules make getting your daily collagen more convenient, simple, and enjoyable than ever before.

SUPPORTS STRONG HAIR
AND NAILS

We’ve included type I, II, and III hydrolyzed collagen to deliver the essential multi collagen peptides your hair and nails require to stay healthy, strong, and resilient to breakage.

PROMOTES HEALTHY, GLOWING SKIN

This Multi Collagen formula supports healthy skin from within and may enhance skin elasticity, minimize fine lines and wrinkles, boost hydration, and promote vibrant skin for a youthful, glowing complexion.

ALL THE BENEFITS
OF COLLAGEN

Formulated with the ultimate blend of all 5 essential collagen types, our Multi Collagen capsules make getting your daily collagen more convenient, simple, and enjoyable than ever before.

SUPPORTS STRONG HAIR
AND NAILS

We’ve included type I, II, and III hydrolyzed collagen to deliver the essential multi collagen peptides your hair and nails require to stay healthy, strong, and resilient to breakage.

PROMOTES AN ACTIVE
LIFESTYLE

Designed to support optimal daily performance, this Multi Collagen features type V & X hydrolyzed collagen from eggshell membrane to support healthy bones, joints, and a balanced gut. 

TRYPSIN AND CHYMOTRYPSIN BLEND

These important digestive enzymes are produced by your pancreas. They help your body absorb and utilize the essential amino acids in collagen required for tissue building and maintenance.

ALL 5 ESSENTIAL
COLLAGEN TYPES

To ensure you get the most from your daily collagen, we’ve included all 5 essential collagen types for optimal wellness (I, II, III, X, and V) from four premium food-derived sources: eggshell membrane, bovine, fish, and chicken collagen.

PROMOTES AN
ACTIVE LIFESTYLE

Designed to support optimal daily performance, this Multi Collagen features type V & X hydrolyzed collagen from eggshell membrane to support healthy bones, joints, and a balanced gut. 

TRYPSIN AND CHYMOTRYPSIN BLEND

These important digestive enzymes are produced by your pancreas. They help your body absorb and utilize the essential amino acids in collagen required for tissue building and maintenance.

ALL 5 ESSENTIAL COLLAGEN TYPES

To ensure you get the most from your daily collagen, we’ve included all 5 essential collagen types for optimal wellness (I, II, III, X, and V) from four premium food-derived sources: eggshell membrane, bovine, fish, and chicken collagen.

NATURE'S BEST FOR YOUR HEALTH

COMPLETE INGREDIENT TRANSPARENCY


EGGSHELL MEMBRANE COLLAGEN (TYPES V & X)

This thin, delicate lining found within the eggshell is packed with essential amino acids that are considered extremely important for healthy bones, joints, and skin.

Featuring hydrolyzed collagen types V & X, eggshell membranes provide an excellent source of wellness-supporting collagen to help keep you moving comfortably through life.

BOVINE AND FISH COLLAGEN (TYPES I & III)

Type I & III hydrolyzed collagen proteins, the two most commonly-found types in the human body, work together in this powerful Multi Collagen formula to support radiant hair, skin, nails, and overall wellness. 

Sourced from premium food-derived fish and bovine collagen, these types are highly beneficial for skin health and may help support skin elastin, smooth fine lines and wrinkles, and promote a youthful-looking complexion. 

CHICKEN COLLAGEN (TYPE II)

Often referred to as the “joint support” collagen, type II collagen is the primary foundation of the cartilage that protects your joints. 

Hydrolyzed chicken collagen is considered to be one of the best sources of bone and joint-supporting type II collagen for supporting an active lifestyle and promoting comfortable movement.

SUGGESTED USE OF OUR MULTI COLLAGEN CAPSULES


HOW TO USE

Adults, as a dietary supplement, take four capsules daily, preferably with a light meal and water, or as recommended by your healthcare provider.*

For best results, combine with a healthy routine that includes balanced meals, exercise, water, and plenty of rest.


*Capsules enlarged to show texture to every suggested “Servings per container”

BENEFITS


† These statements have not been approved by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

SERVINGS PER CONTAINER

Each bottle of Multi Collagen contains 120 capsules, a one-month supply. The recommended daily serving is 4 capsules per day, but can be increased or decreased depending on the individual’s needs or when directed by a medical professional.*


*Capsules enlarged to show texture to every suggested “Servings per container”

SUPPLEMENT FACTS


1. As your body adapts to your new supplement routine, it’s important to remember that every individual is different and health benefits may vary from person to person. Always consult with your physician before using this or any other product if you have a preexisting condition or take prescription medication.
2. If you are pregnant, nursing, taking medication, or have an existing condition, be sure to consult with your physician before taking this or any other dietary supplement.
3. Store in a cool, dry place. Keep out of reach of children.

These statements have not been approved by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Adults, as a dietary supplement, take four capsules daily, preferably with a light meal and water, or as recommended by your healthcare provider. 

For best results, combine with a healthy routine that includes balanced meals, exercise, water, and plenty of rest.


*capsules enlarged to show texture to every suggested “Servings per container”


*capsules enlarged to show texture to every suggested “Servings per container”

Each bottle of Multi Collagen contains 120 capsules, a one-month supply. The recommended daily serving is 4 capsules per day, but can be increased or decreased depending on the individual’s needs or when directed by a medical professional.


*capsules enlarged to show texture to every suggested “Servings per container”


1. As your body adapts to your new supplement routine, it’s important to remember that every individual is different and health benefits may vary from person to person. Always consult with your physician before using this or any other product if you have a preexisting condition or take prescription medication.
2. If you are pregnant, nursing, taking medication, or have an existing condition, be sure to consult with your physician before taking this or any other dietary supplement.
3. Store in a cool, dry place. Keep out of reach of children.

* These statements have not been approved by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

*capsules enlarged to show texture to every suggested “Servings per container”

Adults, as a dietary supplement, take four capsules daily, preferably with a light meal and water, or as recommended by your healthcare provider.*

For best results, combine with a healthy routine that includes balanced meals, exercise, water, and plenty of rest.


*Capsules enlarged to show texture to every suggested “Servings per container”


† These statements have not been approved by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Each bottle of Multi Collagen contains 120 capsules, a one-month supply. The recommended daily serving is 4 capsules per day, but can be increased or decreased depending on the individual’s needs or when directed by a medical professional.*


*Capsules enlarged to show texture to every suggested “Servings per container”


1. As your body adapts to your new supplement routine, it’s important to remember that every individual is different and health benefits may vary from person to person. Always consult with your physician before using this or any other product if you have a preexisting condition or take prescription medication.
2. If you are pregnant, nursing, taking medication, or have an existing condition, be sure to consult with your physician before taking this or any other dietary supplement.
3. Store in a cool, dry place. Keep out of reach of children.

† These statements have not been approved by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

DON'T TAKE OUR WORD FOR IT

DON'T TAKE OUR WORD FOR IT

HEAR WHAT OUR CUSTOMERS ARE SAYING!

HEAR WHAT OUR CUSTOMERS ARE SAYING!

PRIMAL MULTI COLLAGEN REVIEWS

check out the most recent Primal Multi Collagen reviews created by our customers

FREQUENTLY ASKED QUESTIONS


What is Collagen?

Collagen is the most abundant protein in the body and provides the structure and building blocks for hair, skin, nails, bones, tendons, ligaments, and more. It is one of the most vital nutrients supporting many of the body’s functions and overall wellness. As we age, we begin to lose more and more essential collagen each year.

Why choose Primal Multi Collagen?

Our Multi Collagen capsules are made in the USA with premium hydrolyzed collagen sources from all five essential collagen types (I, II, III, X, and V).*

It’s a simple yet effective formula for daily wellness support to help you support your hair, skin, nails, joint, bone, and gut health. It’s an excellent option for anyone who has trouble swallowing pills but still wants to enjoy the benefits of collagen supplements.

What is Type I Collagen?

Type I collagen is the strongest and the most abundant protein found in the human body (and in all vertebrates). As the primary building block of your skin, type I is considered the most beneficial collagen protein type for supporting healthy skin as we age. Eggshell membranes, bovine, and marine collagen are all excellent sources of type I collagen.

What is Type II Collagen?

Type II collagen, often referred to as the “joint support” collagen, is the primary foundation of the cartilage that protects our joints. Hydrolyzed chicken collagen is considered to be one of the best sources of bone and joint-supporting type II collagen.

What is Type III Collagen?

Type III collagen is usually associated with type I collagen and together, this multi collagen pair makes up the two most commonly-found types in the human body. Also highly beneficial for supporting a healthy complexion, type III collagen is one of the primary building blocks of our organs and skin, and can be found in abundance in bovine sources.

What is Type V Collagen?

Type V collagen is a form of fibrillar collagen that can be found alongside type II collagen in joint-supporting cartilage. As a minor collagen component, it plays a fundamental role in the interstitial matrix of our muscles, lungs, liver, and bone matrix. Similarly to type I & X, type V collagen can be found in abundance in eggshell membranes.

What is Type X Collagen?

Type X collagen is often known as a “network-forming” collagen and, found within our cartilage, it is fundamental for new bone formation in articular cartilage (the healthy, friction-preventing cartilage in our joints that makes it easier to move). Similarly to type I & V collagen, type X can be found in abundance in eggshell membranes.

What is the best way to use Primal Harvest Multi Collagen?

You can use this product in the morning, afternoon, evening or even right before bed. There is no specific time to take Multi Collagen, but in general, you will maximize the benefits of the product by taking it consistently.

How long will a Bottle of Primal Multi Collagen Last?

Are there any allergy concerns with this product?

Can I take this product if I Have a medical condition?

This product is intended for use by healthy adults over the age of 18.If you have a pre-existing condition, take prescription medications, or have any medical concerns, we always recommend consulting with your personal physician before starting a new supplement routine.

How long will it take for my Bottles of Primal Multi Collagen to arrive?

Orders received before 3pm EST will ship the same day, with the exception of major holidays. If your order doesn’t make it out on the same day, not to worry! It will be shipped out the following business day.

Please allow 2-4 business days for your package to arrive. In some specific cases, it may take up to 2 extra business days. We will provide you with a tracking number once the package leaves our warehouse. If you have any questions, please visit our Shipping page here:https://primalharvest.com/policies/shipping-policy.

How do I store this product?

For maximum effectiveness and shelf life, please store your Multi Collagen in a cool, dry place away from moisture, direct sunlight, and extreme temperatures.

What is the shelf life of my Primal Multi Collagen?

If stored properly and unopened, Multi Collagen should generally retain its shelf life for about two years.

Once opened, we recommend using the product within 90 days for maximum effectiveness. Each bottle contains a 30-day supply if taken daily.

HOW MANY BOTTLES SHOULD I PURCHASE?

This is totally up to you! Since consistency is the key to maximum benefits, we recommend taking advantage of our discounts when you purchase 6 or more containers of our Multi Collagen formula. You are always protected by our 90-day money-back guarantee, which allows for plenty of time to try our Multi Collagen and see if it is the right fit for you..

If you are using a discount code, please note that your discount code cannot be combined with any other offer or discount code and excludes all sale items and subscription purchases.

WHERE IS MULTI COLLAGEN MADE?* 

Our Multi Collagen is formulated and manufactured in the USA in a GMP-certified facility (Good Manufacturing Practices) according to the highest safety and quality regulations.

It is independently third party lab-tested in the USA and is formulated with premium globally sourced ingredients (both domestic and imported) to ensure we use only the best ingredients available worldwide.*

WHAT DOES IT MEAN IF MY ORDER IS “PENDING”?

There may be a few reasons why your order is listed as “pending:”

  1. Incorrect address.
  2. Order was placed after processing cut-off time for the day.

    3. It is the weekend or special holiday. Orders are only processed Monday-Friday. If you feel that none of those apply to your order feel free to reach out to our Customer Service Department Monday-Friday 9 am - 5 pm EST or email us atsupport@primalharvest.com

WE GUARANTEE


90-DAY MONEY-BACK GUARANTEE


We want you to be 100% satisfied with all the products you buy at the Primal Harvest Store.

If you're not entirely happy with your purchase, we will refund your money in full, or exchange the products.


*Primal Harvest products are made and manufactured in the USA using premium globally sourced ingredients (both domestic and imported) to ensure we use only the best ingredients available worldwide.

† These statements have not been evaluated by the FDA Food & Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease. The information provided by this website or this company is not a substitute for a face-to-face consultation with your physician and should not be construed as individual medical advice. The testimonials on this website are individual cases and do not guarantee that you will get the same results. All content, including text, graphics, images and information, contained on or available through this web site is for general information purposes only.

CitatioNS

NEW THERAPEUTIC STRATEGY FOR AMINO ACID MEDICINE: GLYCINE IMPROVES THE QUALITY OF SLEEP
Bannai M, Kawai N. New therapeutic strategy for amino acid medicine: glycine improves the quality of sleep.J Pharmacol Sci. 2012;118(2):145-148. doi:10.1254/jphs.11r04fm.

COLLAGEN HYDROLYSATE FOR THE TREATMENT OF OSTEOARTHRITIS AND OTHER JOINT DISORDERS: A REVIEW OF THE LITERATURE
Bello AE, Oesser S. Collagen hydrolysate for the treatment of osteoarthritis and other joint disorders: a review of the literature.Curr Med Res Opin. 2006;22(11):2221-2232. doi:10.1185/030079906X148373.  

A 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;11(10):2494. Published 2019 Oct 17. doi:10.3390/nu11102494. 

DAILY CONSUMPTION OF THE COLLAGEN SUPPLEMENT PURE GOLD COLLAGEN® REDUCES VISIBLE SIGNS OF AGING
Borumand M, Sibilla S. Daily consumption of the collagen supplement Pure Gold Collagen® reduces visible signs of aging [published correction appears in Clin Interv Aging. 2020 Feb 04;15:131].Clin Interv Aging. 2014;9:1747-1758. Published 2014 Oct 13. doi:10.2147/CIA.S65939. 

COLLAGEN PEPTIDES AMELIORATE INTESTINAL EPITHELIAL BARRIER DYSFUNCTION IN IMMUNOSTIMULATORY CACO-2 CELL MONOLAYERS VIA ENHANCING TIGHT JUNCTIONS
Chen Q, Chen O, Martins IM, et al. Collagen peptides ameliorate intestinal epithelial barrier dysfunction in immunostimulatory Caco-2 cell monolayers via enhancing tight junctions.Food Funct. 2017;8(3):1144-1151. doi:10.1039/c6o01347c.

ORAL COLLAGEN SUPPLEMENTATION: A SYSTEMATIC REVIEW OF DERMATOLOGICAL APPLICATIONS
Choi FD, Sung CT, Juhasz ML, Mesinkovsk NA. Oral Collagen Supplementation: A Systematic Review of Dermatological Applications.J Drugs Dermatol. 2019;18(1):9-16. 

24-WEEK STUDY ON THE USE OF COLLAGEN HYDROLYSATE AS A DIETARY SUPPLEMENT IN ATHLETES WITH ACTIVITY-RELATED JOINT PAIN
Clark KL, Sebastianelli W, Flechsenhar KR, et al. 24-Week study on the use of collagen hydrolysate as a dietary supplement in athletes with activity-related joint pain.Curr Med Res Opin. 2008;24(5):1485-1496. doi:10.1185/030079908x291967.

TYPE X COLLAGEN, A NATURAL COMPONENT OF MOUSE ARTICULAR CARTILAGE: ASSOCIATION WITH GROWTH, AGING, AND OSTEOARTHRITIS
Eerola I, Salminen H, Lammi P, et al. Type X collagen, a natural component of mouse articular cartilage: association with growth, aging, and osteoarthritis.Arthritis Rheum. 1998;41(7):1287-1295. doi:10.1002/1529-0131(199807)41:7<1287::AID-ART20>3.0.CO;2-D. 

ENHANCEMENT OF DIETARY PROTEIN DIGESTION BY CONJUGATED BILE ACIDS
Gass J, Vora H, Hofmann AF, Gray GM, Khosla C. Enhancement of dietary protein digestion by conjugated bile acids.Gastroenterology. 2007;133(1):16-23. doi:10.1053/j.gastro.2007.04.008.

A DOUBLE-BLIND, PLACEBO-CONTROLLED, RANDOMISED, CLINICAL STUDY ON THE EFFECTIVENESS OF COLLAGEN PEPTIDE ON OSTEOARTHRITIS
Kumar S, Sugihara F, Suzuki K, Inoue N, Venkateswarathirukumara S. A double-blind, placebo-controlled, randomised, clinical study on the effectiveness of collagen peptide on osteoarthritis.J Sci Food Agric. 2015;95(4):702-707. doi:10.1002/jsfa.6752.

SPECIFIC COLLAGEN PEPTIDES IMPROVE BONE MINERAL DENSITY AND BONE MARKERS IN POSTMENOPAUSAL WOMEN-A RANDOMIZED CONTROLLED STUDY
König D, Oesser S, Scharla S, Zdzieblik D, Gollhofer A. Specific Collagen Peptides Improve Bone Mineral Density and Bone Markers in Postmenopausal Women-A Randomized Controlled Study.Nutrients. 2018;10(1):97. Published 2018 Jan 16. doi:10.3390/nu10010097.

CHAPTER 5 - TYPE V COLLAGEN
Leeming, D.J, and M.A Karsdal. Chapter 5 - Type V Collagen. InBiochemistry of Collagens, Laminins and Elastin, Elsevier Inc, 2016: 43–48. doi:10.1016/B978-0-12-809847-9.00005-2.

HYDROLYZED COLLAGEN-SOURCES AND APPLICATIONS
León-López A, Morales-Peñaloza A, Martínez-Juárez VM, Vargas-Torres A, Zeugolis DI, Aguirre-Álvarez G. Hydrolyzed Collagen-Sources and Applications.Molecules. 2019;24(22):4031. Published 2019 Nov 7. doi:10.3390/molecules24224031. 

UNDENATURED TYPE II COLLAGEN (UC-II®) FOR JOINT SUPPORT: A RANDOMIZED, DOUBLE-BLIND, PLACEBO-CONTROLLED STUDY IN HEALTHY VOLUNTEERS
Lugo JP, Saiyed ZM, Lau FC, et al. Undenatured type II collagen (UC-II®) for joint support: a randomized, double-blind, placebo-controlled study in healthy volunteers.J Int Soc Sports Nutr. 2013;10(1):48. Published 2013 Oct 24. doi:10.1186/1550-2783-10-48. 

EFFICACY AND TOLERABILITY OF AN UNDENATURED TYPE II COLLAGEN SUPPLEMENT IN MODULATING KNEE OSTEOARTHRITIS SYMPTOMS: A MULTICENTER RANDOMIZED, DOUBLE-BLIND, PLACEBO-CONTROLLED STUDY
Lugo, J.P., Saiyed, Z.M. & Lane, N.E. Efficacy and tolerability of an undenatured type II collagen supplement in modulating knee osteoarthritis symptoms: a multicenter randomized, double-blind, placebo-controlled study.Nutr J 15, 14 (2015). doi:10.1186/s12937-016-0130-8.

ORAL SUPPLEMENTATION OF SPECIFIC COLLAGEN PEPTIDES HAS BENEFICIAL EFFECTS ON HUMAN SKIN PHYSIOLOGY: A DOUBLE-BLIND, PLACEBO-CONTROLLED STUDY
Proksch E, Segger D, Degwert J, Schunck M, Zague V, Oesser S. Oral supplementation of specific collagen peptides has beneficial effects on human skin physiology: a double-blind, placebo-controlled study.Skin Pharmacol Physiol. 2014;27(1):47-55. doi:10.1159/000351376.

HAIR FOLLICLE DERMAL STEM CELLS REGENERATE THE DERMAL SHEATH, REPOPULATE THE DERMAL PAPILLA, AND MODULATE HAIR TYPE
Rahmani W, Abbasi S, Hagner A, et al. Hair follicle dermal stem cells regenerate the dermal sheath, repopulate the dermal papilla, and modulate hair type.Dev Cell. 2014;31(5):543-558. doi:10.1016/j.devcel.2014.10.022. 

EGGSHELL MEMBRANE IN THE TREATMENT OF PAIN AND STIFFNESS FROM OSTEOARTHRITIS OF THE KNEE: A RANDOMIZED, MULTICENTER, DOUBLE-BLIND, PLACEBO-CONTROLLED CLINICAL STUDY
Ruff KJ, Winkler A, Jackson RW, DeVore DP, Ritz BW. Eggshell membrane in the treatment of pain and stiffness from osteoarthritis of the knee: a randomized, multicenter, double-blind, placebo-controlled clinical study.Clin Rheumatol. 2009;28(8):907-914. doi:10.1007/s10067-009-1173-4.

BENEFICIAL EFFECTS OF NATURAL EGGSHELL MEMBRANE VERSUS PLACEBO IN EXERCISE-INDUCED JOINT PAIN, STIFFNESS, AND CARTILAGE TURNOVER IN HEALTHY, POSTMENOPAUSAL WOMEN
Ruff KJ, Morrison D, Duncan SA, Back M, Aydogan C, Theodosakis J. Beneficial effects of natural eggshell membrane versus placebo in exercise-induced joint pain, stiffness, and cartilage turnover in healthy, postmenopausal women.Clin Interv Aging. 2018;13:285-295. Published 2018 Feb 19. doi:10.2147/CIA.S153782.

NUTRITIONAL FACTORS AND HAIR LOSS
Rushton DH. Nutritional factors and hair loss.Clin Exp Dermatol. 2002;27(5):396-404. doi:10.1046/j.1365-2230.2002.01076.x.

THE ROLE OF TYPE X COLLAGEN IN FACILITATING AND REGULATING ENDOCHONDRAL OSSIFICATION OF ARTICULAR CARTILAGE
Shen G. The role of type X collagen in facilitating and regulating endochondral ossification of articular cartilage.Orthod Craniofac Res. 2005;8(1):11-17. doi:10.1111/j.1601-6343.2004.00308.x.

MARINE ORIGIN COLLAGENS AND ITS POTENTIAL APPLICATIONS
Silva TH, Moreira-Silva J, Marques AL, Domingues A, Bayon Y, Reis RL. Marine origin collagens and its potential applications.Mar Drugs. 2014;12(12):5881-5901. Published 2014 Dec 5. doi:10.3390/md12125881. 

HYDROLYZED COLLAGEN INTAKE INCREASES BONE MASS OF GROWING RATS TRAINED WITH RUNNING EXERCISE
Takeda S, Park JH, Kawashima E, Ezawa I, Omi N. Hydrolyzed collagen intake increases bone mass of growing rats trained with running exercise.J Int Soc Sports Nutr. 2013;10(1):35. Published 2013 Aug 6. doi:10.1186/1550-2783-10-35.

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. doi:10.2353/ajpath.2006.051302. 

ENHANCING SKIN HEALTH: BY ORAL ADMINISTRATION OF NATURAL COMPOUNDS AND MINERALS WITH IMPLICATIONS TO THE DERMAL MICROBIOME
Vollmer DL, West VA, Lephart ED. Enhancing Skin Health: By Oral Administration of Natural Compounds and Minerals with Implications to the Dermal Microbiome.Int J Mol Sci. 2018;19(10):3059. Published 2018 Oct 7. doi:10.3390/ijms19103059.

COMPREHENSIVE ANALYSIS OF PROTEIN DIGESTION USING SIX TRYPSINS REVEALS THE ORIGIN OF TRYPSIN AS A SIGNIFICANT SOURCE OF VARIABILITY IN PROTEOMICS
Walmsley SJ, Rudnick PA, Liang Y, Dong Q, Stein SE, Nesvizhskii AI. Comprehensive analysis of protein digestion using six trypsins reveals the origin of trypsin as a significant source of variability in proteomics.J Proteome Res. 2013;12(12):5666-5680. doi:10.1021/pr400611h

REVIEW OF HAIR FOLLICLE DERMAL CELLS
Yang CC, Cotsarelis G. Review of hair follicle dermal cells.J Dermatol Sci. 2010;57(1):2-11. doi:10.1016/j.jdermsci.2009.11.005.

CHARACTERIZATION OF COLLAGEN FROM EGGSHELL MEMBRANE
Yu-Hong Zhao and Yu-Jie Chi, 2009. Characterization of Collagen from Eggshell Membrane.Biotechnology, 8: 254-258. doi:10.3923/biotech.2009.254.258.