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What is a Continuous Glucose Monitor?

Testing & Tracking Weight & Metabolism
Written by AgelessRx Clinical & Research Team Last Updated: October 5, 2026

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A Continuous Glucose Monitor (CGM) is a wearable medical device that measures your blood sugar levels in real time, around the clock, without fingersticks. AgelessRx now offers CGM through a partnership with Nutrisense, using the Stelo biosensor by Dexcom. A thin, flexible filament inserted just under the skin samples glucose from interstitial fluid and syncs readings to the Nutrisense app every 15 minutes. CGMs are used by a growing number of health-conscious adults who want to see exactly how their diet, exercise, fasting, and stress affect their blood sugar throughout the day.

That real-time data turns abstract lifestyle advice into personalized feedback. Instead of guessing how a meal or a missed night of sleep affects your glucose, you can see it. For anyone focused on metabolic health, weight management, or long-term longevity, a CGM offers a window into one of the most important biomarkers in the body.

Key Takeaways:

  • A CGM sensor measures glucose levels continuously via a thin filament inserted just under the skin, providing real-time readings without fingersticks
  • CGM data helps users understand how diet, exercise, fasting, and stress directly affect blood glucose levels over time
  • Maintaining healthy blood sugar levels through CGM-guided lifestyle adjustments may help reduce the risk of type 2 diabetes and weight gain

What Is a Continuous Glucose Monitoring System (CGM)?

A Continuous Glucose Monitoring system, also known as a CGM sensor, has become a popular device for health and longevity conscious individuals. The CGM sensor uses a thin, flexible filament inserted just under the skin to measure glucose levels every minute.

Readings sync automatically every 15 minutes via Bluetooth to the Nutrisense app, so no scanning is required to see your glucose levels. The Stelo by Dexcom biosensor is an over-the-counter device available without a prescription, designed for non-insulin-using adults who want insight into how lifestyle choices affect their blood glucose levels.

What Are the Longevity Benefits of Using a CGM Sensor?

CGM sensors provide real-time results along with a complete overview of your glucose levels. The device shows where your glucose is, keeps a record of your glucose history, and can indicate how it’s changing.

The easy and pain-free monitoring lets you see how diet, fasting, exercise, and stress influence blood glucose levels. The detailed readings make it easier to make informed lifestyle changes, including seeing how dietary guidelines align with longevity. Healthy blood sugar levels are also associated with reduced weight gain risk and a lower likelihood of developing type 2 diabetes.

Currently prescribed Metformin? If so, CGM sensors can be helpful to dial in the proper dosage (for example, you may find that 1,500mg/day gives you optimal results over 1,000mg/day). Review our guide on Metformin dosing and be aware of Metformin side effects. Consult your clinician before making any dosage adjustments.

How Does a CGM Sensor Work?

The Stelo biosensor by Dexcom, available through our CGM sensor offering, is worn on the back of the upper arm. After a 30 minute warmup period, it continuously measures glucose in the fluid just under the skin and syncs readings to the Stelo app every 15 minutes. Those readings are then surfaced with deeper tracking, trend analysis, and insights through the Nutrisense app. The sensor is water resistant and can be worn while exercising, showering, and swimming. A prescription is required to get started through AgelessRx.

What Type of CGM Does AgelessRx Carry?

Through an exclusive partnership with Nutrisense, AgelessRx offers the Stelo biosensor, a CGM that requires a prescription. The CGM program includes 2 biosensors per month, continuous coverage, access to the Nutrisense app with Nora AI insights, and support from glucose-certified registered dietitians. Members can get started at agelessrx.com/cgm-sensor/.

How Do You Set Up and Share Data With Your CGM App?

Once your Stelo biosensor is applied to the back of your upper arm, you’ll need to wait about 30 minutes for the warmup period before readings begin. After that, your glucose data syncs automatically to the Stelo app every 15 minutes via Bluetooth, so there’s no scanning or manual syncing required.

For a deeper look at your data, download the Nutrisense app, which offers detailed glucose charts, daily averages, trend analysis, meal responses, and goal tracking. Nutrisense also includes Nora, an AI dietitian that reviews your glucose patterns around the clock, along with access to human glucose-certified registered dietitians who can help build a personalized plan based on your readings.

Why Nutrisense Stands Out

Most CGM programs give you a sensor and a data feed. The AgelessRx x Nutrisense program goes further by pairing the Stelo biosensor by Dexcom with a full suite of tools built to make those readings meaningful.

The Nutrisense app surfaces glucose charts, daily averages, time-in-range scores, meal response comparisons, and habit tracking in one place. Nora, Nutrisense’s AI dietitian, analyzes your glucose patterns around the clock and flags trends before they become problems. Eligible members can also work one-on-one with a glucose-certified registered dietitian who uses Nora’s insights to build a plan specific to your biology and goals. The program ships two biosensors per month, and is available to adults 18 and older who are not on insulin, for $99/month with a 6-month commitment.

Ready to Get Started?

You can request a CGM prescription through AgelessRx; if approved by a clinician, your order ships directly to your home.

Note: The above statements have not been reviewed by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Reviewed by AgelessRx Clinical & Research Team

The AgelessRx Clinical & Research Team brings together expertise across medicine, molecular biology, neuroscience, clinical research, and applied longevity science. Our team helps develop and review educational content using peer-reviewed research, academic sources, clinical evidence, and established medical guidance.

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Frequently asked questions

01 <strong>What is a CGM sensor and how does it measure blood glucose?</strong>

A CGM sensor uses a thin, flexible filament inserted just under the skin to measure glucose levels through interstitial fluid every minute, sending real-time readings to your smartphone. Unlike traditional fingerstick testing, the sensor runs continuously for up to 15 days, recording your glucose history and showing directional trends at a glance.

02 <strong>Can a CGM sensor help you dial in your Metformin dose?</strong>

A CGM can give you and your clinician a clearer picture of how blood sugar responds at different doses, which may help inform whether an adjustment makes sense for your goals. Any dosage changes should be reviewed with your clinician before making them.

03 <strong>How do I share my CGM data with my care team?</strong>

Once your CGM sensor is active, you can share glucose data directly with a clinician or family member through the Nutrisense app, which provides glucose charts, daily averages, and trend reports that offer context between appointments. This makes it easier to track how diet, exercise, or a new medication regimen is affecting your levels over time.

04 <strong>How does a CGM fit into a broader personal longevity and healthspan plan?</strong>

A CGM is one of the most actionable tools you can add to a longevity plan because it turns abstract lifestyle advice into real-time, personalized data. Where general guidelines, such as the American College of Sports Medicine’s recommendations on aerobic and resistance exercise, or the CDC’s guidance on sleep for adults, tell you what to do, a CGM shows you whether it is working for your specific biology. You can see exactly how a post-dinner walk blunts a glucose spike, how a poor night of sleep drives fasting glucose up the next morning, or how a fasting protocol affects your levels hour by hour. Paired with other baseline health metrics like blood pressure (using an AMA-validated device) and cardiovascular risk assessments, CGM data gives your clinician richer context to personalize recommendations and track progress between visits.

05 <strong>Do you need a prescription to get a CGM through AgelessRx?</strong>

Yes, a prescription is required. You can request one through AgelessRx, and if approved by a clinician, your Stelo CGM by Dexcom ships directly to your home. You can get started through the AgelessRx x Nutrisense program.

06 <strong>What lifestyle factors can a CGM help you monitor?</strong>

A CGM gives you real-time feedback on how diet, fasting, exercise, and stress each affect your blood glucose levels throughout the day. Over time, this data helps you make more informed lifestyle adjustments to support healthy blood sugar and reduce the long-term risk of conditions like type 2 diabetes and unwanted weight gain.