Collagen Drinks: Science-Backed Benefits, Myths & How to Choose the Best

Introduction: The Collagen Drink Revolution

Walk into any health food store or scroll through Instagram, and you'll encounter countless collagen drinks promising youthful skin, strong nails, and healthy joints. But do they actually work, or are they just expensive placebos?

The global collagen market reached $8.7 billion in 2023 and is projected to exceed $16.7 billion by 2030. Collagen drinks specifically represent the fastest-growing segment, with liquid collagen sales increasing by 30% year-over-year. But behind the hype lies real science—and some important nuances consumers need to understand.

This comprehensive guide cuts through the marketing noise to deliver evidence-based information about collagen drinks: what they are, how they work, what benefits are supported by research, and how to identify quality products that deliver real results.

What Is Collagen? The Body's Structural Protein

The Science of Collagen

Collagen is the most abundant protein in the human body, comprising approximately 30% of total protein content. It's the primary structural component of:

• Skin (70-80% of skin's protein is collagen)
• Bones (collagen provides the framework for calcium deposition)
• Cartilage (collagen gives joints cushioning and flexibility)
• Tendons and ligaments (collagen provides tensile strength)
• Blood vessels (collagen maintains arterial integrity)
• Hair and nails (collagen contributes to strength and growth)

Think of collagen as the "scaffolding" that holds your body together. It provides structure, elasticity, and strength to tissues throughout the body.

Collagen Types: Not All Are Equal

There are 28 different types of collagen in the human body, but four types account for 90% of collagen:

Type I Collagen (90% of body's collagen)

• Location: Skin, bones, tendons, ligaments, teeth
• Function: Provides tensile strength and structure
• Benefits: Skin elasticity, bone density, wound healing
• Most important for beauty and anti-aging

Type II Collagen (10% of collagen, but critical)

• Location: Cartilage (joints)
• Function: Cushioning and shock absorption
• Benefits: Joint health, mobility, cartilage repair
• Important for joint support and athletic recovery

Type III Collagen

• Location: Skin, blood vessels, internal organs
• Function: Supports Type I in skin structure
• Benefits: Skin firmness, vascular health
• Works synergistically with Type I for skin

Type IV Collagen

• Location: Basement membranes (layers between tissues)
• Function: Filtration and tissue separation
• Benefits: Skin barrier function, kidney filtration

For collagen drinks focused on beauty (skin, hair, nails), Types I and III are most important.

The Collagen Decline: Why Supplementation Matters

Age-Related Collagen Loss

Starting around age 25, the body's natural collagen production begins to decline:

• Ages 25-30: 1-1.5% annual decline
• Ages 30-40: 1.5% annual decline (accelerates)
• Ages 40-50: 2% annual decline
• Post-menopause (women): Up to 30% loss in first 5 years

By age 60, your body produces about 50% less collagen than in your 20s. This decline manifests as:

• Fine lines and wrinkles
• Loss of skin elasticity and firmness
• Thinning, brittle nails
• Slower hair growth
• Joint stiffness and pain
• Decreased bone density
• Slower wound healing

Factors That Accelerate Collagen Breakdown

Beyond natural aging, several factors speed up collagen degradation:

1. Sun Exposure (UV Radiation)

• UV rays trigger enzymes (MMPs) that break down collagen
• UV exposure is the #1 environmental cause of premature skin aging
• One severe sunburn can cause lasting collagen damage

2. Sugar and Processed Foods

• Excess sugar causes "glycation"—glucose molecules bind to collagen
• Glycation makes collagen stiff, brittle, and discolored
• High-sugar diets accelerate visible aging

3. Smoking

• Reduces blood flow to skin (starves collagen-producing cells)
• Introduces toxins that damage collagen fibers
• Smokers show 40% more wrinkles than non-smokers

4. Chronic Stress

• Elevates cortisol (stress hormone)
• High cortisol inhibits collagen synthesis
• Stress accelerates cellular aging

5. Poor Sleep

• Collagen synthesis peaks during deep sleep
• Chronic sleep deprivation reduces collagen production
• 7-9 hours of quality sleep is essential

6. Alcohol Consumption

• Dehydrates skin (collagen requires hydration)
• Depletes Vitamin C (essential for collagen synthesis)
• Increases inflammation (damages existing collagen)

How Collagen Drinks Work: The Science of Absorption

From Bottle to Bloodstream: The Journey

Many skeptics question whether drinking collagen can actually benefit your skin. After all, won't stomach acid break down the protein?

Here's what actually happens:

Step 1: Hydrolysis (Pre-Digestion) Quality collagen drinks contain hydrolyzed collagen (also called collagen peptides). Hydrolysis is a process that breaks down large collagen molecules into smaller peptides—essentially pre-digesting the protein.

Step 2: Absorption Hydrolyzed collagen peptides have high bioavailability:

• 90%+ absorption rate (compared to 60-70% for pills)
• Small peptides easily pass through intestinal wall
• Enter bloodstream within 30-60 minutes

Step 3: Distribution Once in the bloodstream, collagen peptides:

• Circulate throughout the body
• Accumulate in skin, joints, and connective tissues
• Signal fibroblasts (collagen-producing cells) to increase production
• Provide amino acid building blocks for new collagen synthesis

Step 4: Stimulation Research shows collagen peptides don't just provide raw materials—they actively stimulate fibroblasts to produce more collagen. This signaling effect amplifies benefits beyond simple nutrition.

The Bioavailability Advantage of Liquid Collagen

Liquid collagen (drinks) vs. Pills/Powders:

Factor	Liquid Collagen	Powder/Pills
Absorption Rate	90-95%	60-70%
Time to Bloodstream	30-60 minutes	60-120 minutes
Hydration Benefit	Yes (beverages provide fluid)	No
Convenience	Grab-and-go	Mixing/swallowing required
Taste	Often flavored	Often chalky
Consistency	High (easy habit)	Lower (requires effort)

Liquid collagen offers superior bioavailability because:

1. Already dissolved (no breakdown needed)
2. Rapid absorption (liquid form)
3. Includes hydration (collagen needs water to function)
4. Higher compliance (easier to consume daily)

Science-Backed Benefits of Collagen Drinks

1. Skin Health: The Most Researched Benefit

What the Studies Show:

Skin Elasticity:

• Study (Proksch et al., 2014): 2.5g-5g daily collagen increased skin elasticity by 7-15% after 8 weeks
• Improvement most pronounced in women over 35
• Effects sustained with continued use

Wrinkle Reduction:

• Study (Inoue et al., 2016): 10g daily collagen reduced wrinkle depth by up to 20% after 12 weeks
• Crow's feet and forehead lines showed greatest improvement
• Participants reported smoother, more hydrated skin

Skin Hydration:

• Study (Bolke et al., 2019): Collagen supplementation increased skin moisture content by 12-18%
• Improved skin barrier function
• Reduced transepidermal water loss (TEWL)

Skin Density:

• Research shows collagen supplementation increases dermal density
• Thicker, more resilient skin
• Better resistance to environmental damage

Optimal Dosage for Skin: 2.5-10 grams hydrolyzed collagen daily

Timeline for Visible Results:

• 4 weeks: Improved hydration, subtle smoothness
• 8-12 weeks: Visible reduction in fine lines
• 12-16 weeks: Noticeable improvement in elasticity and firmness

2. Hair and Nails: Supporting Evidence

Hair Health:

While fewer studies specifically focus on hair, collagen's mechanism supports hair health:

• Keratin Production: Hair is made of keratin, which requires amino acids from collagen
• Scalp Health: Collagen supports blood vessels that nourish hair follicles
• Antioxidant Properties: Collagen amino acids fight free radicals that damage hair

Anecdotal evidence and smaller studies suggest:

• Faster hair growth
• Thicker hair strands
• Reduced hair breakage
• Improved scalp health

Nail Health:

Research shows more compelling evidence for nails:

• Study (Hexsel et al., 2017): 2.5g daily collagen for 24 weeks increased nail growth rate by 12%
• Reduced nail brittleness by 42%
• Decreased frequency of broken nails by 64%

Optimal Dosage for Hair/Nails: 2.5-5 grams daily

Timeline: 8-12 weeks for noticeable improvement

3. Joint Health: Beyond Beauty

Cartilage Support:

Multiple studies demonstrate collagen's benefits for joint health:

• Study (García-Coronado et al., 2019): 10g daily collagen improved joint pain and function in athletes
• Meta-analysis (Bello & Oesser, 2006): Collagen supplementation reduced activity-related joint pain by 30-40%
• Research shows collagen accumulates in cartilage and stimulates cartilage regeneration

Mechanisms:

1. Provides raw materials for cartilage repair
2. Reduces inflammation in joints
3. Stimulates chondrocytes (cartilage cells) to produce more collagen
4. Improves joint lubrication and cushioning

Who Benefits Most:

• Athletes and active individuals
• People with osteoarthritis
• Aging adults experiencing joint stiffness
• Those recovering from joint injuries

Optimal Dosage for Joints: 10 grams daily (higher than skin benefits)

Timeline: 12-24 weeks for significant joint improvement

4. Bone Density: Emerging Research

Bones are about 30% collagen, providing the framework for calcium deposition. Emerging research suggests collagen supplementation may support bone health:

• Study (König et al., 2018): Collagen peptides increased bone mineral density in postmenopausal women
• Combined with calcium and Vitamin D, collagen improved bone markers
• May reduce risk of osteoporosis

Note: More research needed, but preliminary data is promising.

5. Gut Health: The Collagen-Gut Connection

Collagen contains amino acids (glycine, proline, glutamine) that support gut lining:

• Glycine: Anti-inflammatory, supports stomach acid production
• Proline: Helps repair intestinal lining
• Glutamine: Primary fuel for intestinal cells

While research is limited, collagen may benefit:

• Leaky gut syndrome
• Inflammatory bowel conditions
• Digestive discomfort

More research needed in this area.

Collagen Drinks vs. Other Collagen Supplements

Comparison: Drinks, Powders, Pills, and Topicals

Supplement Type	Pros	Cons	Best For
Collagen Drinks	High bioavailability, convenient, includes hydration, tasty	More expensive per serving	Daily use, convenience, compliance
Collagen Powder	Versatile (add to smoothies/coffee), cost-effective	Requires mixing, less convenient	Home use, customization
Collagen Pills	Portable, no taste	Lower absorption, large pills, requires swallowing	Travel, convenience
Topical Collagen	Direct application	Cannot penetrate skin (molecules too large), limited efficacy	Surface hydration only

Important: Topical collagen creams cannot increase skin's collagen levels. Collagen molecules are too large to penetrate the skin barrier. Topical products only provide surface hydration.

Internal supplementation (drinks, powders, pills) is the only proven way to increase collagen levels.

How to Choose Quality Collagen Drinks: Evaluation Guide

1. Check Collagen Type and Source

Collagen Sources:

Marine Collagen (Fish)

• Primarily Type I collagen
• Smallest peptide size = highest bioavailability
• Best for skin, hair, nails
• Sustainable if wild-caught
• Recommended for beauty benefits

Bovine Collagen (Cow)

• Types I and III collagen
• Good for skin, bones, joints
• Widely available
• Ensure grass-fed, pasture-raised

Porcine Collagen (Pig)

• Similar to bovine
• Less common in drinks

Chicken Collagen

• Type II collagen
• Best for joint health specifically
• Less common in beauty drinks

For beauty-focused drinks (skin, hair, nails): Marine collagen (Type I) is optimal.

2. Verify Collagen Dosage

Effective Dosages Based on Research:

• Skin/Hair/Nails: 2.5-10 grams per serving
• Joint Health: 10 grams per serving
• Bone Health: 5-10 grams per serving

Red Flags:

• Products that don't list collagen amount
• "Proprietary blends" hiding dosage
• Less than 2 grams per serving (ineffective)

Look for products with 2.5-10g hydrolyzed collagen clearly stated on label.

3. Assess Additional Ingredients

Synergistic Ingredients (Enhance Collagen Benefits):

Vitamin C (Essential)

• Vitamin C is required for collagen synthesis
• Without adequate Vitamin C, your body cannot produce collagen
• Look for 60-100mg Vitamin C per serving
• Critically important—Vitamin C deficiency = collagen deficiency

Hyaluronic Acid

• Holds 1,000x its weight in water
• Hydrates skin from within
• Works synergistically with collagen
• Look for 100-200mg per serving

Biotin (Vitamin B7)

• Supports hair and nail health
• Enhances collagen benefits for beauty
• Look for 100-300% Daily Value

Antioxidants

• Vitamin E, green tea extract, resveratrol
• Protect collagen from free radical damage
• Support overall anti-aging effects

Red Flags:

• Excessive added sugar (>10g per serving)
• Artificial sweeteners (aspartame, sucralose)
• Artificial colors or preservatives
• Unnecessary fillers

4. Check for Third-Party Testing

Quality Assurance Indicators:

• COA (Certificate of Analysis) available
• Third-party tested (NSF, Informed Sport, etc.)
• GMP (Good Manufacturing Practices) certified
• Heavy metal testing (important for marine collagen)
• No contaminants or adulterants

Red Flags:

• No testing information available
• Lack of transparency
• Suspiciously low prices (indicates low quality)

5. Evaluate Sustainability and Ethics

For Marine Collagen:

• Wild-caught vs. farmed fish
• Sustainable fishing practices (MSC certified)
• Fish skin/scales (upcycled) vs. whole fish

For Bovine Collagen:

• Grass-fed, pasture-raised sources
• Ethical animal welfare standards
• Geographic origin (European standards typically higher)

Packaging:

• Recyclable materials (glass, aluminum, recyclable PET)
• Carbon-neutral shipping
• Minimal packaging waste

Common Myths About Collagen Drinks (Debunked)

Myth 1: "Collagen drinks don't work because stomach acid destroys the protein"

Reality: Hydrolyzed collagen is broken down into small peptides that survive digestion. Research consistently shows these peptides are absorbed and reach target tissues. Bioavailability studies confirm 90%+ absorption.

Myth 2: "You can get the same benefits from eating collagen-rich foods"

Reality: While bone broth and gelatin contain collagen, they provide much lower doses of bioavailable peptides. You'd need to consume large amounts daily (difficult and impractical). Hydrolyzed collagen drinks provide concentrated, easily absorbed collagen.

Myth 3: "Topical collagen creams are just as effective"

Reality: Collagen molecules are too large to penetrate the skin barrier. Topical products only provide surface hydration. Internal supplementation is the only proven way to increase collagen levels in the skin.

Myth 4: "All collagen products are the same"

Reality: Quality varies dramatically:

• Collagen type (Type I best for skin)
• Hydrolysis quality (smaller peptides = better absorption)
• Dosage (many products are underdosed)
• Additional ingredients (Vitamin C is essential)
• Source and purity (marine vs. bovine, testing)

Myth 5: "Collagen works overnight"

Reality: Collagen supplementation requires consistency:

• Initial benefits: 4-6 weeks
• Visible improvements: 8-12 weeks
• Optimal results: 12-16+ weeks
• Benefits cease when supplementation stops

Collagen isn't a quick fix—it's a long-term investment in skin and joint health.

Myth 6: "Vegan collagen is just as good"

Reality: True collagen is animal-derived (fish, cow, pig). "Vegan collagen" products contain collagen boosters (Vitamin C, amino acids, silica) that support your body's own collagen production. While helpful, they don't provide collagen peptides directly. Results may be slower and less pronounced than animal-derived collagen.

Who Should (and Shouldn't) Take Collagen Drinks

Ideal Candidates for Collagen Supplementation

Ages 25-35 (Preventive Phase)

• Collagen production just beginning to decline
• Early intervention prevents visible aging
• Maintains youthful skin elasticity
• Sets foundation for long-term skin health

Ages 35-50 (Active Anti-Aging)

• Most noticeable benefits in this age group
• Combats accelerating collagen loss
• Reverses early signs of aging
• Supports joint health as activity continues

Ages 50+ (Restoration and Maintenance)

• Significant collagen decline
• Focuses on maintaining skin integrity
• Joint and bone health become priorities
• May require higher doses (10g daily)

Athletes and Active Individuals

• Joint support and recovery
• Tendon and ligament health
• Faster injury healing
• Performance optimization

Specific Conditions:

• Early signs of aging (fine lines, loss of elasticity)
• Joint pain or stiffness
• Brittle nails, thinning hair
• Post-surgical recovery (wound healing)
• Osteoarthritis

Who Should Avoid or Use Caution

Allergies:

• Fish/shellfish allergies: Avoid marine collagen
• Beef/dairy allergies: Avoid bovine collagen
• Check labels for allergen warnings

Medical Conditions:

• Kidney disease: High protein intake may be contraindicated
• Calcium kidney stones: Collagen contains calcium-binding amino acids
• Always consult doctor if you have chronic health conditions

Pregnancy and Breastfeeding:

• Limited research on safety during pregnancy
• Most experts consider it safe, but consult OB-GYN first
• Choose high-quality, tested products

Interactions:

• Generally safe with most medications
• Theoretically could interact with calcium or protein-restrictive diets
• Consult healthcare provider if taking multiple supplements

Maximizing Collagen Drink Benefits: Best Practices

1. Consistency is Key

Daily Supplementation:

• Take collagen every day (not sporadically)
• Same time each day helps build habit
• Benefits accumulate over weeks/months

Recommended Duration:

• Minimum 8-12 weeks to assess efficacy
• Ongoing supplementation for sustained benefits
• Benefits diminish if supplementation stops

2. Optimal Timing

Morning (Empty Stomach):

• Pros: Maximum absorption, no food interference
• Cons: Some people experience mild nausea

Evening (Before Bed):

• Pros: Collagen synthesis peaks during sleep, supports overnight skin repair
• Cons: None (recommended timing)

With Meals:

• Pros: No stomach upset, convenient
• Cons: Slightly reduced absorption

Verdict: Evening before bed is optimal, but consistency matters more than timing.

3. Enhance Absorption with Vitamin C

Vitamin C is absolutely essential for collagen synthesis. Without it, your body cannot produce collagen, regardless of how much you supplement.

Sources of Vitamin C:

• Citrus fruits (oranges, lemons, grapefruit)
• Berries (strawberries, blueberries)
• Bell peppers
• Kiwi
• Broccoli
• Many collagen drinks include Vitamin C

Recommendation: Ensure 75-100mg Vitamin C daily (either in collagen drink or separate).

4. Stay Hydrated

Collagen requires water to function properly. Dehydrated skin cannot benefit fully from collagen supplementation.

Hydration Goals:

• 2-3 liters water daily (more if active/hot climate)
• Collagen drinks contribute to hydration
• Avoid excessive caffeine/alcohol (dehydrating)

5. Support with Lifestyle Factors

Sun Protection:

• UV damage destroys collagen faster than you can rebuild it
• SPF 30+ daily (even indoors near windows)
• Collagen supplementation + sun protection = synergistic

Diet:

• High-quality protein (provides amino acid building blocks)
• Antioxidant-rich foods (protect collagen from damage)
• Low-sugar diet (prevents glycation)
• Omega-3 fats (support skin barrier)

Sleep:

• 7-9 hours quality sleep
• Collagen synthesis peaks during deep sleep
• Poor sleep negates supplementation benefits

Stress Management:

• Chronic stress elevates cortisol
• High cortisol inhibits collagen production
• Meditation, exercise, adequate rest

Collagen Drinks by No Bullshit Drinks: Science-Backed Beauty Water

At No Bullshit Drinks, we formulated our collagen beverage based on clinical research and optimal dosing—no marketing hype, just results.

Akvile Beauty Water:

Ingredients:

• 5,000mg Marine Collagen (Type I): Premium hydrolyzed fish collagen, optimal bioavailability
• Hyaluronic Acid (150mg): Hydrates skin from within, works synergistically with collagen
• Biotin (300% DV): Supports hair and nail health
• Vitamin C (100mg): Essential cofactor for collagen synthesis
• Natural Flavoring: No artificial sweeteners or colors
• Zero Added Sugar: Clean formulation

Why It Works:

• Clinically effective collagen dose (5g)
• Complete synergistic formula (Vitamin C + Hyaluronic Acid + Biotin)
• Marine collagen (Type I = best for skin)
• Third-party tested for purity
• European quality standards

Expected Results:

• 4-6 weeks: Improved skin hydration
• 8-12 weeks: Visible reduction in fine lines
• 12+ weeks: Noticeably firmer, more elastic skin

No false promises. No inflated claims. Just science-backed beauty support.

Frequently Asked Questions (FAQ)

Q: How long does it take to see results from collagen drinks?

A: Timeline varies by individual and benefit:

• Skin hydration: 2-4 weeks
• Fine line reduction: 8-12 weeks
• Skin elasticity improvement: 12-16 weeks
• Hair/nail strengthening: 8-12 weeks
• Joint comfort: 12-24 weeks

Consistency is critical—daily supplementation for at least 8-12 weeks.

Q: Can I take collagen drinks if I'm allergic to fish?

A: No. If you have a fish/shellfish allergy, avoid marine collagen. Choose bovine (cow) collagen instead, which provides Types I and III collagen with similar benefits.

Q: Will collagen drinks make me gain weight?

A: No. Collagen is pure protein (4 calories per gram) with no fat or carbs. Most collagen drinks contain 20-40 calories per serving—negligible impact on weight. Protein actually supports weight management by increasing satiety.

Q: Can men benefit from collagen drinks too?

A: Absolutely. While marketed toward women, men experience the same age-related collagen decline. Men benefit from:

• Joint health (especially athletes)
• Skin health (slows aging)
• Tendon and ligament support
• Bone density maintenance

Q: Do I need to take collagen forever?

A: Benefits cease when supplementation stops. Think of collagen drinks as nutritional support—like taking vitamins. For sustained anti-aging benefits, ongoing supplementation is recommended. You can cycle on/off, but results will fluctuate.

Q: Can I take collagen with other supplements?

A: Yes. Collagen is safe to take with:

• Multivitamins
• Omega-3s
• Probiotics
• Vitamin D
• Calcium (supports bone health)

Avoid mega-dosing protein from multiple sources (could strain kidneys in sensitive individuals).

Q: Is collagen safe during pregnancy?

A: Most experts consider collagen safe during pregnancy, but always consult your OB-GYN first. Choose high-quality, tested products. Benefits may include:

• Supporting skin elasticity during pregnancy
• Reducing stretch marks (anecdotal)
• Supporting joint health (relaxin loosens joints)

Q: Can I cook or heat collagen drinks?

A: Avoid heating collagen drinks. High temperatures can denature (damage) collagen peptides, reducing effectiveness. Consume at room temperature or chilled.

Q: Why is marine collagen more expensive?

A: Marine collagen is pricier due to:

• Smaller, more bioavailable peptides (better absorption)
• More expensive extraction process
• Sustainable fishing practices increase costs
• Type I collagen (best for skin) requires specific fish sources

Higher price reflects superior quality and efficacy.

Conclusion: Investing in Your Skin's Future

Collagen drinks aren't a miracle cure, but they are one of the most scientifically supported beauty supplements available. When chosen wisely and used consistently, they offer measurable benefits for skin, hair, nails, and joints.

Key Takeaways:

1. ✅ Collagen drinks work: Research consistently shows benefits for skin elasticity, hydration, and wrinkle reduction
2. ✅ Quality matters: Choose hydrolyzed marine collagen (Type I), 2.5-10g per serving, with Vitamin C
3. ✅ Consistency is essential: Daily use for 8-12+ weeks required for visible results
4. ✅ Realistic expectations: Collagen slows aging and improves skin health—it doesn't reverse 20 years overnight
5. ✅ Holistic approach: Combine collagen drinks with sun protection, healthy diet, adequate sleep, and stress management

The No Bullshit Bottom Line:

If you're over 25, experiencing early signs of aging, or want to maintain youthful skin, collagen drinks are a worthwhile investment—if you choose quality products with proven ingredients at effective doses.

Avoid gimmicks, marketing hype, and underdosed products. Demand transparency, third-party testing, and science-backed formulations.

Your skin deserves better than empty promises.

Ready for collagen drinks that actually work?

Try Akvile Beauty Water: 5,000mg marine collagen + hyaluronic acid + biotin + Vitamin C. European quality. Zero BS.

Scientific References:

1. Proksch E, et al. "Oral supplementation of specific collagen peptides has beneficial effects on human skin physiology: a double-blind, placebo-controlled study." Skin Pharmacology and Physiology, 2014; 27(1):47-55.
2. Bolke L, et al. "A Collagen Supplement Improves Skin Hydration, Elasticity, Roughness, and Density: Results of a Randomized, Placebo-Controlled, Blind Study." Nutrients, 2019; 11(10):2494.
3. Inoue N, et al. "Ingestion of bioactive collagen hydrolysates enhance facial skin moisture and elasticity and reduce facial ageing signs in a randomised double-blind placebo-controlled clinical study." Journal of the Science of Food and Agriculture, 2016; 96(12):4077-81.
4. Hexsel D, et al. "Oral supplementation with specific bioactive collagen peptides improves nail growth and reduces symptoms of brittle nails." Journal of Cosmetic Dermatology, 2017; 16(4):520-526.
5. García-Coronado JM, et al. "Effect of collagen supplementation on osteoarthritis symptoms: a meta-analysis of randomized placebo-controlled trials." International Orthopaedics, 2019; 43(3):531-538.
6. König D, et al. "Specific Collagen Peptides Improve Bone Mineral Density and Bone Markers in Postmenopausal Women—A Randomized Controlled Study." Nutrients, 2018; 10(1):97.
7. European Food Safety Authority (EFSA). "Scientific Opinion on the substantiation of health claims related to collagen." EFSA Journal, 2011.