Health From the Inside Out - and the Outside In

When we think about health, we often focus on what we put into our bodies — the food we eat, the supplements we take, and the lifestyle habits we build.

But health is not only shaped from the inside. It is also influenced by what we put on our bodies.

Our skin is the largest organ of the body. It serves as a protective barrier while also interacting directly with the environment. Certain compounds applied to the skin can penetrate the skin barrier and, in some cases, enter circulation.

Before diving into skincare and product choices, it helps to understand the structure of the skin.

The Three Layers of the Skin

1. Epidermis

The epidermis is the outermost layer of the skin. It acts as a protective shield against environmental stressors such as pollution, dust, bacteria, and other harmful substances.

It also plays an essential role in preventing water loss and maintaining skin hydration.

An important function of this layer is its involvement in vitamin D synthesis. When the skin is exposed to sunlight, UVB rays trigger a reaction in the epidermis that begins the production of vitamin D, an essential nutrient involved in immune function, bone health, and many metabolic processes.

2. Dermis

The dermis is the middle layer of the skin and is much thicker than the epidermis.

This layer provides structure and elasticity to the skin and supplies nutrients and oxygen to the epidermis through a network of blood vessels.

The dermis contains important structures such as:

• hair follicles

• collagen and elastin fibers

• sweat glands

• sebaceous (oil) glands

• blood vessels

• nerve endings

These components help regulate temperature, provide sensation, and maintain the skin’s strength and resilience.

3. Hypodermis

The hypodermis, also known as the subcutaneous layer, is the deepest layer of the skin.

Its main functions include:

• storing fat as an energy reserve

• insulating the body

• cushioning and protecting internal organs

• anchoring the skin to deeper tissues

This layer is composed mainly of adipose tissue (fat cells), connective tissue, and larger blood vessels.

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As we can see, the skin plays a crucial role in many essential processes in the body. It not only protects us from external threats but also reflects our overall health and well-being.

Healthy skin is often associated with vitality and confidence, which is why it also plays an important role in self-esteem and how we feel about ourselves.

The Pivotal Role of the Skin Microbiome

The human microbiome is a diverse community of microorganisms — including bacteria, fungi, and viruses — that live on and inside the body.

In fact, microbial genes in the body are estimated to outnumber human genes by a significant margin.

The skin, along with the gut, hosts one of the largest microbiomes in the body. These microorganisms play an essential role in maintaining skin health, supporting the immune system, and influencing the aging process.

Researchers often refer to the relationship between gut health and skin health as the skin–gut axis.

When the microbiome is balanced, it helps maintain a strong skin barrier and healthy immune responses. When it becomes disrupted, it may contribute to inflammation and various skin conditions.

Why What We Put on Our Skin Matters

Understanding these processes helps us realize how important it is to be mindful of the products we apply to our skin.

Many cosmetics and personal care products contain long lists of synthetic ingredients, some of which may disrupt the skin barrier or irritate sensitive skin.

Artificial fragrances, for example, are known to contain numerous chemical compounds and can sometimes act as endocrine disruptors, potentially interfering with hormonal balance.

For this reason, I personally prefer to minimize synthetic fragrances in the products I use.

I also avoid scented candles unless they are made with natural ingredients and essential oils.

Several apps can help analyze the ingredients found in skincare and cosmetic products. Some of the tools I use include Yuka, EWG, and Oasis, which allow you to scan products and better understand what they contain.

Fortunately, there are now many companies offering cleaner, safer skincare options that prioritize ingredient transparency and skin health.

Over the years I’ve discovered several brands that I really like, and you can find a list of some of my favorite ones here.

3 Simple Steps to Start Cleaning Up Your Skincare Routine

Making better choices for your skin doesn’t require throwing away every product you own or completely overhauling your routine overnight. Small, mindful changes can already make a meaningful difference.

1. Start Reading Ingredient Lists

Just like with food, becoming familiar with ingredient lists is the first step toward making more informed choices.

Pay particular attention to products that stay on your skin for long periods of time, such as moisturizers, serums, foundations, and body lotions. These are often more important to evaluate than products that are quickly rinsed off.

Learning to recognize certain ingredients — especially synthetic fragrances and unnecessary additives — can help you gradually move toward simpler, cleaner formulations.

2. Simplify Your Routine

Modern skincare routines can sometimes include ten or more products, but more is not always better.

Often the skin benefits from a simpler approach with fewer products and carefully chosen ingredients. A gentle cleanser, a quality moisturizer, and sun protection can form a solid foundation for healthy skin.

Adding too many products at once can sometimes disrupt the skin barrier rather than support it.

3. Choose Brands That Value Transparency

More companies today are prioritizing ingredient transparency and thoughtful formulations.

Look for brands that clearly explain what they include — and what they avoid — in their products. Companies that focus on fewer, high-quality ingredients often make it easier for consumers to understand what they are putting on their skin.

Over time, building a skincare routine based on products you trust can support both skin health and overall well-being.

Final Thought

Many aspects of our environment — pollution, toxins, and other exposures — are often outside of our control. But some choices are within our reach.

Being mindful of what we put on our skin is one simple way to support our overall health. By choosing products thoughtfully and reducing unnecessary ingredients, we can take a small but meaningful step toward caring for our bodies from the inside out and the outside in.