A $38 barrier serum that earned its place by week six

Barrier serums are an easy thing to sell and a hard thing to judge. The promise is always the same: fewer flare-ups, less tightness, skin that simply behaves. None of that shows up in a week, which is exactly why this one stayed in the routine for 73 days before we wrote anything down as a conclusion.

What it says it does

Halden Lab describes this as a daily serum that supports the skin barrier with ceramides, panthenol and squalane. There are no acids and no retinoids, and the brand does not promise brightening or anti-ageing. That restraint is part of why we picked it.

The first month

Honestly, not much. The texture is lovely, a thin milky fluid that disappears in about twenty seconds, but skin looked and felt the same at day 30 as at day 1. If we published at the one-month mark, as most reviews do, this would have been a shrug.

If we had published at one month, this would have been a shrug.

Weeks six to ten

The change arrived quietly. Around week six the usual redness around the nose after cleansing stopped appearing. By week eight a cold snap that normally means flaking along the jaw came and went without it. Nothing else in the routine changed during the test.

• Morning and evening, two drops, after cleansing
• Same cleanser, moisturiser and SPF throughout
• No new products introduced during the test window

Who should skip it

If your skin is already comfortable, this will not do anything you can see. It is also a slow product, so it is a poor choice if you want a result before an event next week.