I Used Dexcom for 90 Days — Here’s the Brutal Truth

Dexcom makes continuous glucose monitors (CGMs): small sensors worn on the body that send glucose readings to a phone or receiver. This page sets out what Dexcom says about its UK products so you can judge whether one is relevant to you.

We have not worn or tested a Dexcom sensor. An earlier version of this page described a 90-day test, a score, a comparison table and monthly costs that we cannot support, and that text has been removed. The details below come from Dexcom’s UK site, checked on 6 October 2026.

One point matters most. Dexcom’s UK pages present its products for diabetes management. They do not promote them for general fitness tracking. If you do not have diabetes, speak to a GP or pharmacist before buying one.

What Dexcom sells in the UK

Dexcom’s UK site promotes two systems: Dexcom ONE+ and Dexcom G7. It lists the ONE+ from £35 ex VAT and the G7 from £51.25 ex VAT, each for a 10-day sensor. The site describes the ONE+ as suited to people on multiple daily injections, long-acting insulin or oral and GLP medications.

Dexcom’s UK G7 page says the sensor warms up in 30 minutes, gives a 12-hour grace period when you swap sensors, and is water-resistant and can be submerged under eight feet of water for up to 24 hours when properly installed. It says the G7 connects to Apple Watch and compatible smartphones, with an optional touch-screen receiver. Check Dexcom’s compatibility list for your phone or watch before buying.

Who Dexcom says it is for

Dexcom’s UK site describes the G7 as designed for people who need diabetes management support, including children aged 2 and over, people with hypo unawareness and people managing diabetes in pregnancy. The ONE+ is described in terms of diabetes treatment.

It does not describe either product as a performance or fuelling tool for people without diabetes. We have no evidence of how well a CGM works for that purpose, so this page makes no claim about it.

Price and how to buy

Dexcom’s UK site shows prices “ex VAT”, so the amount you pay at checkout will differ. Prices, supply routes and any NHS availability change, so check the current details on Dexcom’s site or with your diabetes team. We have not verified retail or pharmacy prices elsewhere, and the earlier monthly cost figures have been removed.

If you have diabetes, ask your GP or diabetes clinic whether you are eligible for NHS-funded CGM before paying privately.

Visit Dexcom UK →

Frequently Asked Questions

Is Dexcom made for people without diabetes?

Dexcom’s UK site presents the ONE+ and G7 for diabetes management. It does not promote them for general fitness use. Speak to a GP or pharmacist before buying one if you do not have diabetes.

How long does a Dexcom G7 sensor last?

Dexcom’s UK site lists the G7 at 10 days per sensor, with a 12-hour grace period when you swap to a new one. The G7 page says it warms up in 30 minutes.

Is the Dexcom G7 waterproof?

Dexcom’s UK G7 page says it is water-resistant and may be submerged under eight feet of water for up to 24 hours when properly installed.

Does Dexcom work with Apple Watch and Garmin?

Dexcom’s UK G7 page lists Apple Watch and compatible smartphones. We could not confirm Garmin support from the UK page, so check Dexcom’s compatibility list before buying.

How much does Dexcom cost in the UK?

On 6 October 2026 Dexcom’s UK site listed the ONE+ from £35 ex VAT and the G7 from £51.25 ex VAT, each for a 10-day sensor. Check the current price before you buy.