Apple's Noninvasive Blood Glucose Technology for Future Apple Watch Reaches 'Proof-of Concept' Stage

Apple has made notable progress on noninvasive blood glucose monitoring technology, according to a new report from Bloomberg's Mark Gurman. Planned as a future Apple Watch feature, Apple wants to use the function to allow diabetics and others to test their blood glucose levels without needing to prick the skin for blood testing.

apple watch blood glucose feature
To test glucose levels without blood, Apple is developing a silicon photonics chip that uses optical absorption spectroscopy to shine light from a laser under the skin to determine the concentration of glucose in the body. The technology is in a "proof-of-concept" stage that is viable, but needs to be condensed to a size that can fit into a wearable.

At the current time, the prototype device is sized similarly to an iPhone and can be attached to a person's arm. That is smaller than a prior version that was big enough that it required a tabletop.

TSMC developed the main chip to power the prototype, but Apple previously worked with Rockley Photonics to create sensors and chips for glucose monitoring. Rockley Photonics in 2021 unveiled a digital sensor system that it said could monitor body temperature, blood pressure, glucose trends, hydration, alcohol, lactate, and more. Rockley Photonics made it clear that Apple was its biggest customer in regulatory filings, but Apple ultimately ended the relationship.

Apple has hundreds of engineers in its Exploratory Design Group (XDG) working on the project, but the technology is still years off. According to Bloomberg, the XDG is akin to Google's X research and development project, and it is Apple's most secretive undertaking. Apple has spent hundreds of millions of dollars developing noninvasive glucose monitoring.

Apple initially started work on alternative glucose monitoring after purchasing RareLight in 2010 under the instruction of Steve Jobs. For many years, Apple used a startup called Avolante Health LLC to work quietly on the project in a secret facility before it was transitioned to the XDG.

The under-skin glucose detection technology has been undergoing human trials for the past 10 years, with Apple using a test group of people who have prediabetes and type 2 diabetes, as well as those who have not been diagnosed as diabetic.

Apple wants to be able to warn people if they're prediabetic, enabling lifestyle changes before full-blown diabetes is developed. Apple's regulatory team is holding early discussions about getting government approval for the technology.

Related Roundup: Apple Watch 11
Buyer's Guide: Apple Watch (Buy Now)

Popular Stories

iOS 26 Battery Glass Feature

iPhone 16 Pro Max 80% Charge Limit: One Year Later, Was It Worth It?

Wednesday September 24, 2025 3:58 pm PDT by
With the iPhone 15 series, I did an experiment and kept my iPhone's Charge Limit set at 80 percent for an entire year. It provided an interesting look at the impact of charge limits on battery longevity, so I decided to repeat it for the iPhone 16 line. Since September 2024, my iPhone 16 Pro Max has been limited to an 80 percent charge, with no cheating. As of today, my battery's maximum...
AirPods Pro 3 Newsroom

Apple's 'Back to School' Offer Ends Soon, Now Applies to AirPods Pro 3

Wednesday September 24, 2025 7:20 am PDT by
Apple's annual "Back to School" promotion for students ends soon, so act fast if you want to score free AirPods with the purchase of an eligible new Mac or iPad. Until Tuesday, September 30, college students and qualifying educational staff in the U.S. can receive free AirPods 4 with Active Noise Cancellation when they purchase an eligible new Mac or iPad from Apple. This is a $179 value. ...
iphone 17 pro dark blue 1

Apple Blames In-Store MagSafe Chargers for iPhone 17 Pro Display Model Scratches

Wednesday September 24, 2025 10:22 am PDT by
The marks on the iPhone 17 Pro models that people have noticed at Apple retail stores are caused by the chargers that Apple uses, Apple confirmed today. Apple told 9to5Mac that worn MagSafe charging stands in stores are causing marks on the iPhone 17 Pro and iPhone 17 Pro Max. Apple says that the marks are not scratches, and are instead material transfer from the stand to the phone. The...
iPhone 17 Pro Colors

Skipped the iPhone 17 Pro? Here's What is Rumored for iPhone 18 Pro

Tuesday September 23, 2025 8:55 am PDT by
While the iPhone 18 Pro and iPhone 18 Pro Max are still a year away, there are already a few rumors about the devices that offer an early look ahead. Below, we have recapped some of the early iPhone 18 Pro rumors so far. This story was published previously, and it has been updated to reflect the latest rumors. Many early rumors prove to be true, but nothing is confirmed yet, and Apple's...
iOS 26

Everything New in iOS 26.1 Beta 1

Monday September 22, 2025 12:44 pm PDT by
Apple released the first beta of iOS 26.1 today, just a week after launching iOS 26. iOS 26.1 mainly adds new languages to Apple Intelligence, but there are a few other features that are worth knowing about. New Apple Intelligence Languages Apple Intelligence is now available in Danish, Dutch, Norwegian, Portuguese (Portugal), Swedish, Turkish, Chinese (Traditional), and Vietnamese. AirPo...
ios 26 digital id passport wallet

Apple Confirms iOS 26 Wallet Passport Feature is Coming in 2025

Tuesday September 23, 2025 1:06 pm PDT by
Digital ID, the iOS 26 feature that lets U.S. passport holders add their passports to the Wallet app, is coming later in 2025, Apple confirmed today. Apple updated the release timing wording of Digital ID on its iOS 26 features page. "Digital ID will be coming later this year with US passports only," it reads. Prior to today, the footnote for the feature said "Digital ID will be available ...
apple tv 4k new orange

Next Apple TV Expected to Launch This Year With These New Features

Monday September 22, 2025 10:00 am PDT by
The next Apple TV is expected to be released later this year, and a handful of new features and changes have been rumored for the device. Below, we recap what to expect from the next Apple TV, according to rumors. Likely Features N1 Chip With Wi-Fi 7 Last year, Bloomberg's Mark Gurman said the next Apple TV would be equipped with Apple's own combined Wi-Fi and Bluetooth chip, which is...
iPhone 17 Pro USB C Port

iPhone 17 Pro Max's USB-C Charging Speeds Tested With Apple Chargers

Monday September 22, 2025 7:29 am PDT by
The website ChargerLAB has tested the iPhone 17 Pro Max's USB-C charging speeds with a variety of Apple's chargers, from 18W to 140W. The device reached a peak charging speed of around 36W with the following Apple chargers:40W Dynamic Power Adapter with 60W Max 61W USB-C Power Adapter 67W USB-C Power Adapter 70W USB-C Power Adapter 96W USB-C Power Adapter 140W USB-C Power AdapterFor...
50 New Features and Changes Worth Checking Out in macOS Tahoe

50 New macOS Tahoe Features and Changes Worth Checking Out

Wednesday September 24, 2025 8:43 am PDT by
Apple this month released macOS Tahoe, the latest version of the company's Mac operating system. ‌macOS Tahoe 26 adopts Apple's new Liquid Glass design along with new customizations, a new Phone app, and updated capabilities across the platform. In this article, we've selected 50 new features and lesser-known changes that are worth checking out if you're upgrading. What do you think of...

Top Rated Comments

bigboy29 Avatar
34 months ago
This will be an instant buy, when it materializes!
Score: 47 Votes (Like | Disagree)
Apple_Robert Avatar
34 months ago
It sounds like it is 5+ years away.
Score: 37 Votes (Like | Disagree)
TheYayAreaLiving ?️ Avatar
34 months ago
⌚ Game Changer feature! Can't wait for this feature to come to the Apple Watch. It's long overdue.
Score: 26 Votes (Like | Disagree)
lazyrighteye Avatar
34 months ago
If they get this right, it’ll be a game changer.
Score: 25 Votes (Like | Disagree)
MacWiz_007 Avatar
34 months ago
Has Elizabeth Holmes been assisting Apple with this? ? I had to. On a serious note, if perfected this would be outstanding!
Score: 24 Votes (Like | Disagree)
swester Avatar
34 months ago
Not just game-changing, but life-changing for virtually every human being on the planet. Kudos to the engineers who are working on making this possible.
Score: 21 Votes (Like | Disagree)