Let’s break it down: How does the skin absorb what we apply?

Your skin is made of multiple layers. The outermost layer (the stratum corneum) acts as a protective barrier. But certain molecules — especially fat-soluble and small molecular weight compounds — can penetrate this barrier and reach deeper tissues and even the bloodstream.

Studies show that:

• Substances like phthalates, parabens, and benzophenones (commonly found in sunscreens and cosmetics) can be absorbed and later detected in urine, breast milk, and blood serum
• This means your skincare isn’t just cosmetic — it can become systemic

SPF and Retinol: What’s the deal?

Sunscreen (SPF)

Most conventional sunscreens use chemical UV filters like:

• Oxybenzone
• Octinoxate
• Homosalate

These are hormone disruptors (endocrine-disrupting chemicals or EDCs) shown to mimic oestrogen, interfere with thyroid function, and potentially contribute to inflammation and immune dysregulation.

In one FDA study, oxybenzone was still detectable in the blood weeks after a single application.

⚠️ Retinol (Vitamin A derivative)

Retinoids (like retinol or tretinoin) are often prescribed for acne and ageing. But here’s what we know:

• Retinol is a vitamin A derivative, and when applied in high amounts, it can be absorbed into circulation
• Excessive exposure (especially alongside other vitamin A intake) has been linked to liver stress and cellular toxicity
• Animal studies have shown retinoids increase tumour formation when exposed to UV light — which is why retinol should never be worn during the day without SPF

Important: Retinol is not directly carcinogenic, but when used improperly (especially alongside sun exposure), it may contribute to oxidative stress and DNA damage.

What to watch out for in your skincare:

1. Oxybenzone, Octinoxate → Common in chemical sunscreens; linked to hormone disruption
2. Fragrance / Parfum → Often a blanket term for hundreds of unlisted chemicals
3. Parabens (methyl-, propyl-, butyl-) → Preservatives shown to mimic oestrogen
4. SLS/SLES (sodium lauryl sulfate) → Harsh detergents that disrupt skin microbiome
5. PEGs, BHT, BHA → Used in creams and anti-ageing products; linked to oxidative stress

So what can you do?

✅ Switch to mineral SPF: Look for zinc oxide or non-nano titanium dioxide

✅ Use oil-based natural cleansers (e.g. jojoba oil or olive oil infused balms)

✅ Simplify your routine — your skin doesn’t need 12 steps

✅ Choose brands that are transparent about ingredients (e.g. EWG-rated, COSMOS-certified, or Ecocert)

Bottom line?

If you’re working hard to reduce inflammation, heal your gut, and support your nervous system… it doesn’t make sense to load your skin with hormone disruptors or immune agitators.

Skin is not a sealed suit — it’s a living, breathing part of your body.

Choose products that speak the same language as your healing. Your skin, your gut, and your nervous system will thank you.