Life Kit (NPR)

Episode: "Do collagen supplements really work?"

Air Date: October 27, 2025

Host: Marielle Segarra

Guest: Maria Godoy, NPR Health Correspondent

Episode Overview

This episode of Life Kit takes a critical look at the science behind collagen supplements—one of the most hyped wellness products today, touted for supporting skin, hair, nails, and joint health. Host Marielle Segarra teams up with NPR health correspondent Maria Godoy to unpack what collagen actually does in the body, whether supplements deliver on their promises, and practical, science-backed alternatives for keeping skin and joints healthy as we age.

Key Discussion Points & Insights

What is Collagen?

• Structural Role: Collagen is a protein found in bones, tendons, ligaments, cartilage, and especially skin, where it provides elasticity, firmness, and strength.
  • Maria Godoy: “It is a major structural protein in our tissue. So it gives skin elasticity and firmness...” (00:54)
• Decline with Age: Collagen in the body decreases in both quantity and quality starting in our 20s.
  • Marielle Segarra: “Starting in our 20s, the amount of collagen in our bodies and the quality of that collagen starts to decline.” (01:10)
• Accelerators of Decline: Smoking, pollution, sun exposure, and UV radiation speed collagen loss.

The Rise of Collagen Supplements

• Market Expansion: Collagen supplements are now a multi-billion-dollar industry, omnipresent in stores and online, often promoted by influencers.
  • Maria Godoy: “If you just walk into Costco, there’s always like giant bottles of collagen peptides... and if you go on social media, everyone’s promoting it.” (02:01)

How Collagen Supplements Are Made

• Sources: Derived chiefly from animals—fish, pigs, chicken, cattle.
• Forms:
  1. Hydrolyzed collagen (broken down into easily absorbed peptides; marketed for skin, hair, nails, and joints)
  2. Undenatured type II collagen (not broken down; targets joint health, especially for osteoarthritis).
• Mechanisms: Hydrolyzed collagen is thought to travel through the GI tract and help replenish body collagen; undenatured type II is believed to trigger an anti-inflammatory immune response for joint health.
  • Lauren Taglia, MD: “The thought or the theory is that if you ingest it... it goes through the GI tract and... supports or increases collagen production.” (04:52)

What Does the Research Say?

Skin Benefits

• Evidence:
  • Some randomized controlled trials (RCTs) show modest improvements in skin elasticity, dermal thickness, and wrinkles after 8-12 weeks of supplementation.
    • Dr. Marianne Senna (Harvard Dermatologist): “Yeah, there is some evidence that supplements can boost skin...” (06:06)
  • However, meta-analysis of 23 RCTs found that when lower-quality, industry-funded studies are excluded, links between collagen supplements and skin improvements disappear.
    • Senna: “High quality studies and studies not funded by industry did not show a significant association... while those funded by industry... did.” (07:15)
• Hair Benefits: No scientific evidence supporting benefits for hair growth or health.
  • Maria Godoy: “Senna says there are no human studies she's aware of that support this. And so if that's your concern, just don't waste your money.” (07:43)

Joint Health

• Osteoarthritis: Collagen (both forms) has led to improvements in pain and knee function, per some small clinical trials, but most are industry-funded, small, and/or deemed low-quality.

  • Dr. David Felson (BU Osteoarthritis Expert): Notes possible benefit but emphasizes lack of large, high-quality studies; can’t formally recommend. (09:11)

• Practical Summary:

  • If supplements help and are affordable, and if there’s no risk to your health, use them but check with your doctor.

  • Always look for third-party verification to ensure supplement safety and ingredient accuracy.

    Marielle Segarra: “Should we be using collagen supplements or not?”
    Maria Godoy: “...The evidence isn’t there for [doctors] to recommend it. But... if [patients] feel like they help... and it’s not costing them an arm and a leg and they don’t have kidney problems, he’s okay with that.” (09:18)

• Third-Party Certification: Look for seals like NSF Certified for Sport, Informed Sport, or USP Verified Mark on supplement labels and cross-check on certifier websites. (09:52)

Science-Backed Alternatives to Supplements

• Top Dermatologist Advice:
  • Focus on proven lifestyle and skincare habits:
    • Wear sunscreen daily
    • Don’t smoke or drink excessively
    • Eat a Mediterranean-style, protein-rich diet (includes vitamin C, zinc, copper)
    • Use topical retinoids (vitamin A derivatives) at night
    • Get enough sleep and regular exercise
  • Maria Godoy: “If you polled like a hundred dermatologists, 99 of them would tell you that retinoids are the number one thing you should be using to boost collagen and use it at night.” (13:00)
• Notable Moment:

  Maria Godoy: “Good skin in your 40s begins in your tens with sunscreen in your tens.” (15:39)

Memorable Quotes

• Maria Godoy on supplement hype:

  “Supplements, there's something in me that best decision I have ever made was to trust the stranger on Tik Tok.” (02:33)

• Dr. Marianne Senna on evidence quality:

  “High quality studies and studies not funded by industry did not show a significant association.” (07:15)

• On hair claims:

  “If that's your concern, just don't waste your money.” – Maria Godoy (07:43)

• On skincare priorities:

  “If you have 30 bucks to spend ... like no. At least all the doctors I spoke with stressed that there are things you can do to help boost collagen that do have science behind them.” – Maria Godoy (12:32)

• On sunscreen as prevention:

  “Good skin in your 40s begins in your tens with sunscreen in your tens.” – Maria Godoy (15:39)

Timestamps for Key Segments

• Collagen basics & age-related decline – 00:54–01:18
• Why supplements are trendy – 02:01–02:46
• Where supplements come from & how they work – 04:16–05:58
• Evidence for skin and joints – 06:06–09:18
• Third-party supplement verification – 09:48–10:37
• Practical advice & alternatives – 12:19–15:35
• Lifestyle science recap & summary – 15:59–17:25

Key Takeaways / Episode Recap

• Collagen supplements may offer minor improvements in skin and joint health according to some studies, but the best-quality, unbiased research does NOT confirm strong benefits.
• There is essentially no good evidence for hair benefits.
• If you want to support your skin and joint health, stick to habits with real scientific backing:
  • Daily sunscreen, Mediterranean diet, topical retinoids, no smoking, good sleep, regular exercise.
• If you still choose to take collagen supplements, look for third-party certification and consult your doctor.
• Save your money for what actually works—science favors lifestyle over supplements.

For anyone considering collagen supplements, the experts’ message is clear: proceed with caution, scrutinize the evidence, and focus on habits that truly support your body’s natural collagen.