Claire Ashworth Beauty Technology Editor · 7 min read · 6 April 2026

We tested 24 UK skincare devices. Only 5 reached the structural layer.

Most at-home beauty devices work on the surface. A handful actually penetrate to the dermis — where collagen lives, and where the visible changes originate. We spent three months finding out which ones do.

There is a dirty secret in the at-home skincare device market.

The majority of devices sold in the UK — including several bestsellers on Amazon and John Lewis — operate exclusively on the stratum corneum. That is the outermost 0.02mm of your skin. It is, in structural terms, the wrapper.

The structural layer — the dermis, where collagen and elastin actually live — sits one to two millimetres below. To reach it, you need one of three things: an injection, an in-clinic procedure, or a device that transmits energy through skin rather than sitting on top of it.

Three modalities have published evidence for dermal penetration: red light at 630nm, radiofrequency at 1-2 MHz, and microcurrent at 200-400 microamps. We tested 24 devices sold in the UK to see which ones actually deliver these modalities at the wavelengths and intensities studied in the literature.

Five passed. Nineteen did not.

What we looked for.

Every device was evaluated against three criteria drawn from the peer-reviewed literature:

Red light therapy: A controlled trial by Wunsch and Matuschka (Photomedicine and Laser Surgery, 2014) demonstrated significantly improved skin complexion and collagen density using wavelengths between 611-650nm. Devices below 600nm or above 700nm do not match this evidence base.

Radiofrequency: A 136-patient study by el-Domyati et al. (Journal of the American Academy of Dermatology, 2011) showed that monopolar RF at 1-2 MHz produced measurable neocollagenesis and skin tightening over six months.

Microcurrent: The foundational work by Cheng et al. (Clinical Orthopaedics, 1982) showed that electrical stimulation at 200-400 microamps increased ATP production by up to 500% in tissue — the cellular fuel that drives repair.

Any device that does not deliver at least two of these three modalities at the published parameters was eliminated from our shortlist.

The five that passed.

The drawer problem.

During our testing, every tester raised the same concern: what about the devices they already own?

The typical UK skincare buyer who takes devices seriously already has between two and four of them. An LED mask. A microcurrent wand. Perhaps an RF device she bought during lockdown and used twice. They sit in a drawer, cables tangled, batteries dead, reminding her of money spent and intentions abandoned.

This is not a willpower problem. It is a format problem. When your ritual requires three separate devices, three separate charging cables, and thirty minutes of switching between them — the ritual does not survive January.

The No. 01's five-minute single-device format is engineered specifically to survive the drawer. One instrument. One charge. One pass across jawline, cheek, brow, and neck. It is the device designed to be the last one you buy.

The Blocq No. 01 — six modalities, one five-minute pass

The collagen context.

Dermal collagen decreases by approximately one percent per year after the age of twenty-five. During the five years surrounding menopause, it can fall by as much as thirty percent. This is the structural cliff that no topical product can address — because topicals sit on the surface, and the problem lives underneath.

Every device in our top 5 attempts to address this decline. But only one delivers all three modalities at the wavelengths and intensities that have been studied.