The science
This page explains what the device emits and what is and isn't known about it. We would rather set expectations properly than sell you something on the strength of a claim we can't stand behind.
What the device emits
470nm blue light
The visible band, produced by three LEDs aimed at the nail plate. 470nm sits at the blue end of visible light — it is not ultraviolet, and it is not the same as the UVA lamps used in nail salons to cure gel polish. Blue light in this region is used across a range of skin and nail care devices.
910nm infrared
Produced by a single LED, and invisible to the human eye. Longer wavelengths penetrate further into tissue than visible light does, which is why near-infrared is a common pairing with blue in consumer light therapy devices.
Why 7 minutes
The session length is fixed by the device and cannot be changed. A fixed cycle means there are no settings to get wrong and no benefit to be had from overdoing it.
What this is not
- It is not a laser. Devices in this category are frequently marketed as "lasers". Keravix uses LEDs. We'd rather describe it accurately.
- It is not a salon UV lamp. Different wavelength, different purpose. Do not substitute one for the other in either direction.
- It is not a medicine. Nothing is absorbed and nothing enters the bloodstream, which is also why it does not interact with tablets you may already be taking.
- It is not a substitute for a diagnosis. Discoloured or thickened nails have several possible causes — fungal infection, psoriasis, injury, and others. They look similar and they are not managed the same way. If you have never had yours looked at, a podiatrist or GP can tell you what you are actually dealing with, and that is worth knowing before you commit to a nine-month routine.
On the evidence
Light-based approaches to nail and skin care are an active area of research, and published work on blue and near-infrared light exists. What does not exist is a clinical trial of this specific consumer device, and we are not going to imply otherwise by pointing at unrelated studies.
What we can tell you is exactly what the device emits, exactly how to use it, and exactly how long nails take to grow out. What you do with that is your call, and there are 60 days to change your mind.
If you want a clinically proven route
Speak to your GP or a registered podiatrist. Depending on what's actually going on, prescription topical treatments, oral antifungals, or in-clinic procedures may be appropriate, and some are available on the NHS. We would genuinely rather you got the right treatment than bought a device that wasn't suitable.