Algae is one of the oldest living organisms on earth. Three billion years of survival has produced something remarkable: a diverse kingdom of over 30,000 species, each with its own biology, its own adaptive compounds, its own set of tools for staying alive in extreme conditions. Not all algae does the same thing. Each species has a distinct biological function; different compounds, different structures, different effects on your skin. When we talk about an active, we mean the specific organism in a formula that's doing the work. Not a supporting ingredient, not a texture agent — the thing that's actually driving the result. Every Mara product is built around one key algae active, chosen for what that particular species can actually do for skin. Here's what's inside your favourite Mara formulas, and why it's there.