When you read our ingredient lists, one name shows up in both our barrier and scar products: bio activated silk. It is not a marketing flourish. It is a clinically studied bioactive peptide that helps your skin rebuild its own protective barrier, and choosing it was a deliberate decision. Here is what bio activated silk actually is, the science behind how it works, and why we put it at the heart of two of our formulas.

What is bio activated silk?

Bio activated silk is a bioactive peptide derived from natural silk, listed on labels under its INCI name, Fibroin Oligopeptide-1. The specific version we use is Activated Silk 33B-α, made by Evolved By Nature from upcycled silk cocoons using only silk protein, water, and salt. Rather than sitting on top of the skin, it works with your skin's own biology to support a stronger barrier.

That distinction matters. Many ingredients coat the surface and create a temporary feel of softness. Bio activated silk goes a step further by supporting the proteins your skin uses to hold itself together, which is why we built it into both our Barrier Repair Cream and our Scar Support Complex.

How bio activated silk works on your skin

Your skin barrier depends on tight junctions, the connections that bind the top layer of skin cells together. A protein called claudin-1 is central to those junctions. When claudin-1 drops, skin cells loosen and drift apart, which lets hydration escape and lets irritants in. That is the cycle behind dry, inflamed, reactive skin.

Bio activated silk supports your skin's natural production of claudin-1, helping reinforce those tight junctions so the barrier can do its job. Two features make it stand out:

• Non-occlusive: It strengthens the barrier without smothering the skin or clogging it.
• Water-soluble: It works in places ceramides and petrolatum cannot, including lightweight and spray formats.

In short, it is not a patch over the problem. It helps the skin rebuild the structure that keeps it healthy.

What the clinical research shows

We did not choose this ingredient on a hunch. Evolved By Nature ran clinical and lab studies on Activated Silk 33B-α, and the results are specific and measurable. In a 28-day study of a 2% serum against a placebo control, the ingredient delivered the following, based on expert grading and instrument measurements:

A separate rinse-off study using a body wash with bio activated silk found a 12% improvement in TEWL and a 24% improvement in hydration over 7 days, in subjects who were 18 and older with eczema-prone skin. Lower TEWL means the barrier is holding water better, which is exactly what struggling skin needs. All of these figures come from Evolved By Nature's published studies on the ingredient.

Why we chose it for our Barrier Repair Cream

Our Barrier Repair Cream exists to rebuild skin that has become dry, tight, stinging, or reactive. Bio activated silk fits that mission precisely, because reducing water loss and supporting claudin-1 addresses the root of a damaged barrier rather than just masking the symptoms.

It also pairs well with sensitive skin. Because it is non-occlusive and gentle, it supports repair without the heaviness or irritation that some traditional barrier ingredients can cause. For skin that reacts to almost everything, that combination of evidence and gentleness is hard to beat, which is why it earns a place as a core active rather than a token addition.

Why we use it in our Scar Support Complex

Scar care and barrier care overlap more than people expect. Healing skin needs to stay hydrated and protected to mature well, and a compromised barrier can leave a scar looking redder and more irritated for longer. Bio activated silk supports the skin while it recovers, helping calm the appearance of redness and keep the area hydrated.

That is why it appears in our Scar Support Complex alongside our other scar actives. If you are caring for new and existing scars together, the Scar Care Bundle brings that support into one routine built for sensitive skin.

Bio activated silk vs. ceramides and petrolatum

Ceramides and petrolatum are familiar barrier ingredients, and they have their place. But they work mainly by sitting on the surface and slowing water loss from the outside. Bio activated silk takes a different approach:

• It supports the skin's own structure by helping produce claudin-1, rather than only forming a layer on top.
• It is non-occlusive, so it does not rely on a heavy, sealing film.
• It is water-soluble, so it works in lightweight textures and even sprays, where ceramides and petrolatum struggle.

We are not against classic ingredients. We chose bio activated silk because it does something they cannot, and it does it with clinical evidence behind it.

Is bio activated silk sustainable and safe?

Part of why we committed to this ingredient is that it performs without a heavy environmental cost. Activated Silk 33B-α is:

• NATRUE approved as 100% natural.
• Cruelty-free (Leaping Bunny certified).
• Upcycled from silk cocoons sourced as a byproduct, then processed with only silk protein, water, and salt.
• Biodegradable and not formulated with petrochemicals.

For a brand built around sensitive skin, an ingredient that is both clinically proven and gentle on the planet was an easy yes.

Frequently asked questions

Is bio activated silk safe for sensitive skin? Yes. It is gentle, non-occlusive, and was studied in part on eczema-prone and self-described sensitive skin, which is why we use it in products made for reactive skin.

What is bio activated silk on an ingredient label? Look for Fibroin Oligopeptide-1. In our formulas it is the Activated Silk 33B-α form.

Does bio activated silk contain actual silk? It is derived from natural silk protein, broken down into a water-soluble peptide. It is not silk fabric or whole silk fibers.

Is it vegan? It is cruelty-free and Leaping Bunny certified. Because it is sourced from silk, people following a strictly vegan standard may prefer to weigh that themselves.

Which Sting-Less products contain bio activated silk? Our Barrier Repair Cream and our Scar Support Complex both use it as a core ingredient.

The bottom line

We chose bio activated silk because it does the hard part of skincare well: it helps your skin rebuild its own barrier, with clinical data showing lower water loss, calmer redness, and better hydration, all from a gentle, sustainable, upcycled source. You will find it working quietly in both our Barrier Repair Cream and Scar Support Complex. If your skin is dry, reactive, or healing, that is exactly the kind of ingredient worth looking for.