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Do creams really penetrate the skin? And if they do, how deep and how safely?

On the Meder Beauty Podcast, I explain how skincare actually moves through the skin barrier and why penetration is not simply a marketing promise, but a scientific and safety question. I break down the 500 Dalton rule, which ingredients can truly pass through the stratum corneum, and why size, location, and even time of day influence absorption.

I talk about peptides, retinol, niacinamide, acids, and the surprising role of water as one of the strongest penetration enhancers. I also explain why over-exfoliation, microneedling, and barrier damage can increase permeability, sometimes in ways that are not beneficial. Penetration should be selective, smart, and controlled. In this conversation, I’ll help you understand what really reaches your skin and what should not.

Episode resources:

The 500 Dalton rule for the skin penetration of chemical compounds and drugs

Learn more from the previous episodes:

Your Skin’s Hidden Ecosystem: Why the Microbiome Matters More Than You Think

The Magic of Peptides: Why They’re Transforming Skincare Forever

Beyond Retinol: The New Science of Safer, Smarter Skincare

Understanding Acne: Myths vs. Science

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Meder by Dr. Tiina Meder

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In this episode, I’m joined by Sarah Drew, a long-time member of the Meder Beauty team and a frequent guest on the podcast, to talk about how skin reacts to changes in climate, location, and lifestyle.

Drawing from our shared experience working with clients across different environments, and from my own travel between Northern Europe and South Florida, we explore why healthy skin is naturally adaptive and what signs show that skin is struggling to adjust. We discuss how temperature, humidity, UV exposure, air conditioning, water quality, stress, sleep, and food choices affect the skin barrier and microbiome. We also share practical guidance on how to prepare your skin before travel, what to adjust during climate transitions, and why slowing down instead of over treating is often the most effective approach. This episode is about listening to your skin and supporting it through change, not forcing it to behave.

Learn more from the previous episodes:

Beat Jet Lag: Skincare, Sleep & Travel Secrets

Understanding Acne: Myths vs. Science

Sun Protection Strategy: More Than Sunscreen!

How Australian Skin Practitioners Handle Sun Damage

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Sarah Drew Instagram

Meder by Dr. Tiina Meder

Meder Beauty Instagram

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Meder Beauty YouTube

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In this episode, I explore the connection between neuroscience, neurotherapy, and skincare, a topic that is finally gaining the attention it deserves.

Skin and the nervous system are embryological siblings. They develop together, communicate constantly, and use the same biochemical language throughout our lives. This is why stress, lack of sleep, anxiety, and emotional discomfort can instantly change the way our skin looks and feels. I explain how inflammation, microbiome imbalance, and nervous system overactivation contribute to conditions like acne, rosacea, eczema, and chronic itch, and why irritating or sensitizing skincare can affect not only the skin, but also the brain.

This episode is about understanding skin as a communication organ, not just a surface to be treated. When we calm the skin, we calm the nervous system. And that changes everything.

Learn more from the previous episodes:

Food, Microbiome & Skin: The Forgotten Connection

Your Skin’s Hidden Ecosystem: Why the Microbiome Matters More Than You Think

The Sensitive Skin Epidemic: What Your Skin Is Trying to Tell You

Understanding Acne: Myths vs. Science

Episode resources:

Laurent Misery - Dermatologist known for research on neurocutaneous interactions and skin neuroscience

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Meder by Dr. Tiina Meder

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In this episode, I am joined by Dr. Brendan Khong, one of London’s leading aesthetic doctors and someone many call the King of Glow.

What I love about Brendan’s work is that it challenges the aggressive, one size fits all approach that still dominates aesthetic medicine. We talk about why true glow does not come from inflammation, trauma, or trends, but from skin health, longevity, and intelligent regeneration. We discuss how advanced laser technology, inflammation control, skincare, and lifestyle must work together, why not every patient needs retinoids, and why safety and effectiveness should always come before visible results.

This conversation is about a new generation of aesthetic medicine that respects skin biology, works with the body rather than against it, and prioritizes long term skin health over short term glow.

Episode resources:

The Aerolase Neo Elite - Regenerative 1064nm Laser for Acne, Melasma, Skin Rejuvenation

Rexonage3 - advanced aesthetic medical device using Quantum Molecular Resonance (QMR)

Connect with Dr. Brendan:

Dr Brendan Khong Website

Dr Brendan Khong Instagram

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Meder by Dr. Tiina Meder

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Facial redness is often seen as something that needs to be fixed. In this episode, I want to look at it more carefully.

Not all facial redness is rosacea. While rosacea is a serious inflammatory condition that needs proper treatment, many people have persistent facial redness that is genetic and completely benign. I see this confusion often, and when redness is misdiagnosed, the skincare choices that follow can actually make the skin more sensitive and uncomfortable.

I also explain how to recognize the difference between inflammatory redness and a condition called erythema faciei. I also share why aggressive treatments like acids, exfoliation, lasers, or heavy creams are often the wrong approach, and what supportive, science based skincare can really help. Some skin features are not problems to solve. They are part of your skin’s natural story.

Learn more from the previous episodes:

Exfoliation Secrets: How to Renew Your Skin the Smart Way

Sun Protection Strategy: More Than Sunscreen!

SPF Isn’t Enough: The New Language of Sun Care

Connect with us:

Meder by Dr. Tiina Meder

Meder Beauty Instagram

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Meder Beauty YouTube

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This episode feels like sitting at the table with family stories, laughter, and memories shared across generations.

Sarah and I talk about beauty rituals we grew up with. Not trends, not routines from social media, but the habits passed down through families, cultures, and communities. Moisturizing straight after the shower. Cocoa butter, shea butter, Vaseline. Hair rituals that took time and care. Short, clean nails. Fragrance saved for special occasions. Beauty rooted in comfort, protection, and health.

We explore how different cultures approach skin, hair, and self-care, from cold northern climates and sauna traditions to Caribbean and Black American beauty rituals centered around hydration, hair, and expression. We talk honestly about how beauty standards were shaped, questioned, and sometimes resisted, from going grey to wearing red lipstick, from straightening hair to embracing natural texture.

This is a light, joyful conversation, but also a meaningful one. Beauty rituals are not superficial. They are about connection, memory, care, and learning to listen to your body. A perfect episode to remind us that skincare and beauty were never meant to be rushed; they were meant to be shared.

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Sarah Drew Instagram

Meder by Dr. Tiina Meder

Meder Beauty Instagram

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TikTok skincare trends move incredibly fast. One month it’s beef tallow, the next it’s salmon DNA, nano ingredients, or exosomes. Each new idea arrives with urgency and confidence, promising dramatic results and a shortcut to better skin.

In this episode, I talk about why these trends feel so convincing, why they rise so quickly, and why they so often disappear just as fast. I explain where the real risks begin, and why many viral ideas raise serious scientific, ethical, and safety questions once you look beyond the headlines. After nearly 30 years in the beauty industry, I have seen this cycle repeat itself again and again. A concept goes viral. It sounds revolutionary. It promises fast change. And then, quietly, it fades away. I also share what does stand the test of time. Peptides. Microbiome-supportive skincare. Biotechnological ingredients. Approaches that focus on skin longevity rather than short-term beautification.

This episode is an invitation to slow down, ask better questions, and choose skincare that works with biology, not against it.

Episode Resources:

Dermal absorption and short-term biological impact in hairless mice from sunscreens containing zinc oxide nano- or larger particles

Antagonistic Skin Toxicity of Co-Exposure to Physical Sunscreen Ingredients Zinc Oxide and Titanium Dioxide Nanoparticles

Dermal absorption and short-term biological impact in hairless mice from sunscreens containing zinc oxide nano- or larger particles

Toxicity and penetration of TiO2 nanoparticles in hairless mice and porcine skin after subchronic dermal exposure

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Meder by Dr. Tiina Meder

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Tiina Meder LinkedIn

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Is there such a thing as normal skin?

In this episode, I revisit one of the oldest and most misunderstood concepts in skincare. The idea of skin types as dry, oily, normal, or sensitive has been with us for more than a century. But does it still make sense today?

I explain why normal skin is not a scientific reality and why dry or oily skin can still be perfectly healthy. Using modern dermatological knowledge, I break down genetic predispositions, circadian rhythms, microbiome activity, and how skin naturally protects and repairs itself throughout the day and night. I explore when oiliness or dryness is normal, when it becomes a condition, and why aggressive attempts to “fix” shine or tightness often do more harm than good. I also explain why personalized skincare matters far more than chasing an average ideal.

This episode lays the groundwork for understanding your skin as it truly is, individual, dynamic, and biologically intelligent.

Episode resources:

Dr. Leslie Baumann – The Science of Natural Beauty

Standard Evaluation of the Patient: The Merz Scale

Unilever says no to 'normal' with new positive beauty vision

Learn more from the previous episodes:

The Sensitive Skin Epidemic: What Your Skin Is Trying to Tell You

Understanding Wrinkles: Types, Causes & What Actually Works

Skin Pigmentation: Causes, Triggers, and Treatments That Work

Beat Jet Lag: Skincare, Sleep & Travel Secrets

Beyond Retinol: The New Science of Safer, Smarter Skincare

Connect with us:

Meder by Dr. Tiina Meder

Meder Beauty Instagram

Meder Beauty Facebook

Meder Beauty TikTok

Meder Beauty LinkedIn

Meder Beauty YouTube

Listen to the Meder Beauty Podcast on Apple Podcasts