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Three shallow pools of oil on a warm-white surface, with soft blue color diffusing through two of them.

What Does “Preservative-Free” Mean in Skincare?

Three shallow pools of oil on a warm-white surface, with soft blue color diffusing through two of them.
Skin Science

What Does “Preservative-Free” Mean in Skincare?

A preservative-free product can still contain ingredients that keep microbes in check. Here's what the label tells you, why water matters and why oil formulas may still need antioxidants.

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Open white jar of Materia's Omnia solid serum lying on its side, with smooth golden solid serum visible inside, on a warm-white surface.
Skin Science

What Is a Solid Serum? How It Works and Why We Chose It

The oil in a solid serum is still liquid, held in place by a gel network that softens as you spread it. Here's how the format works and why we chose it for Omnia.

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Four clear water droplets beaded on a thin oil film across a matte limestone surface, with the film's edge visible as a thin line.
Skin Science

What Is an Anhydrous Serum? Anhydrous vs. Water-Based Serums Explained

When a serum is made without water, oils and other lipids take its place. Here's what that changes about the ingredients it can carry, how it stays stable and how it helps skin hold moisture.

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