La Roche-Posay Hyalu B5 Hyaluronic Acid Serum for Face, Anti-Aging, 1.7 oz

Why it's worth it

A dermatologist-favorite serum that pairs two molecular weights of hyaluronic acid with madecassoside, a Centella asiatica derivative that calms irritated skin. It costs more than the drugstore options, and for reactive or rosacea-prone faces that premium buys something real.

Madecassoside is the reason to pay more. It's the soothing ingredient derived from Centella asiatica, and none of the drugstore serums here include it. If your cheeks go red and hot from cold wind, a new cleanser, or nothing you can identify, this is the formula in the group built around calming that down rather than just adding water on top.

Two molecular weights cover two different depths. Pure hyaluronic acid stays higher up and plumps the surface; the smaller sodium hyaluronate form travels further in. Using both means you get the immediate smoothing you can see and hydration that holds longer than a single-weight formula manages. The brand's own four-week consumer test found the large majority of users ended up with softer, more hydrated skin.

From our review of 8 hyaluronic acid serums, by Sarah Wright, Editorial Associate

What we like

• +Madecassoside is the reason to pay more
• +Two molecular weights cover two different depths
• +It's built for people who react to things
• +The richer texture suits dry weather

What to know

• –It pills if you rush it
• –The premium only makes sense if you're actually sensitive