Built for insulin sensitivity
Metformin lowers the glucose your liver releases and helps your cells respond to insulin, the metabolic effects it is best known for.
- 180 tabletsSupply
- Metformin ER 500 mgStrength
- Provider reviewedBefore anything ships
The people pictured are models, not patients.
RxLongevity
Metformin ER
The metabolic workhorse, prescribed.
40,000+ products sold · LegitScript certified
Metformin ER 500 mg in an oral extended-release tablet. Explore liver glucose production, insulin sensitivity and the differences from GLP-1 medications.
Explore the ingredients and compare options →- Insulin sensitivity
- One daily tablet
- Decades of human data
- Provider-reviewed
What's Included
- ✓Medication and supplies
- ✓Provider visit and unlimited follow-ups
- ✓Free expedited shipping
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$134 billed today, then every month until canceled.
Not prescribed? Full refund.
After checkout you complete a short medical review in your member portal, and a US-licensed provider reviews it before your metformin ER ships.
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Order today and here is what happens next
- TodayChoose a plan, then a short online intake
- Within about 24 hoursA US-licensed provider reviews your request
- Ships in 3 to 5 daysEstimated ship date, if prescribed
- Full refund
- If a provider does not prescribe it
- Licensed clinicians
- An independent US-licensed clinician reviews every request
- US-licensed pharmacy
- Prepares and ships your prescription
- Discreet delivery
- Plain, unmarked packaging
Common questions
Can you take metformin for longevity?
Metformin is prescribed off-label in longevity protocols for its effects on insulin sensitivity and metabolism, alongside its established diabetes use. A provider reviews suitability.
What does metformin do for metabolism?
It lowers the glucose your liver releases and improves how your body responds to insulin, partly by activating an energy-sensing pathway called AMPK.
Is metformin safe for people without diabetes?
It has decades of safety data. Use outside diabetes is off-label and reviewed by a provider, who checks kidney function and monitors B12 over time.
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Breakfast
The metabolic workhorse, prescribed.
- 01Insulin sensitivity
- 02One daily tablet
- 03Decades of human data
- 04Provider-reviewed
The people pictured are models, not patients.
Why Metformin ER
One daily tablet
The extended-release form is taken once a day with food and is gentler on your stomach than immediate-release.
Decades of human data
Metformin is one of the most prescribed and best studied medicines in the world, with a long safety record.
A provider reviews you
A US-licensed provider reviews your history and labs and prescribes metformin off-label for metabolic health only if it fits you.
How we compare
Metformin ER, without the waiting room.
HealthRX.comTypical in-person visit
Start online, no appointment or waiting roomBook, travel and wait
A US-licensed clinician reviews your history
Price shown before you startDepends on the visit and insurance
No insurance requiredOften billed through insurance
Delivered to your door in a plain boxPick up at the pharmacy
Full refund if you are not prescribedVisit fees usually apply either way
Meet the formula
Follow the glucose pathway, not a wellness slogan.
Metformin has a specific metabolic identity: it is a biguanide medication that affects glucose regulation. The HealthRX.com listing is metformin ER 500 mg, an extended-release oral tablet. Its product story begins with glucose production by the liver, glucose handling and insulin sensitivity. Those mechanisms distinguish it from semaglutide and tirzepatide, which act through incretin-receptor pathways. Understanding the differences makes an oral metabolic option easier to evaluate than grouping every product under weight loss or longevity.
01
Liver
Reduced hepatic glucose production
02
Glucose handling
Effects on intestinal absorption and insulin sensitivity
03
Format
500 mg extended-release oral tablet
Inside the formula
The names on the label, explained.
ER 500 mg
Metformin hydrochloride
Metformin belongs to the biguanide family. Its established pharmacology includes decreasing glucose production by the liver, decreasing intestinal glucose absorption and improving insulin sensitivity. Those actions concern how the body produces and handles glucose. The ER designation belongs to the tablet formulation, while 500 mg identifies the listed strength. Together they distinguish this product from immediate-release metformin and from injectable incretin medications.
A closer look / 01
Why the liver matters to glucose regulation.
Blood glucose comes from more than the carbohydrate in a meal. The liver also produces glucose, including during periods without food. Metformin’s action on hepatic glucose production is therefore an important part of its metabolic explanation. Insulin sensitivity concerns how tissues respond to insulin, another piece of glucose regulation. These connected processes give the medication a more specific identity than a general metabolism label.
A glucose measurement, a change in body weight and a broad question about aging are different endpoints. Understanding the pathway helps you keep them distinct when reading research or comparing products. Metformin’s diabetes evidence concerns defined metabolic populations and outcomes; longevity research asks additional questions of its own.
A closer look / 02
What extended release means in this listing.
Extended release describes a formulation designed to release the active ingredient over an extended period. It is a property of the tablet, separate from the identity of metformin itself. Immediate-release and extended-release products can share the active ingredient while differing in their formulation and product instructions. The current listing identifies ER 500 mg and a 180-tablet catalog quantity.
Tablet strength and container quantity answer different questions. The strength tells you how much metformin is in a listed tablet. The quantity tells you the number of tablets in the catalog option. Neither number should be substituted for an individualized schedule; the purchase listing and the treatment instructions each have their own role.
A closer look / 03
Metformin and incretin medications use different mechanisms.
Semaglutide is a GLP-1 receptor agonist. Tirzepatide activates GIP and GLP-1 receptors. Metformin is a biguanide with a different pharmacologic explanation. The HealthRX.com options also differ in format, with oral metformin tablets and injectable incretin products. That is a meaningful comparison of active ingredient, target and delivery, rather than assuming one product is a tablet version of another.
A closer look / 04
Read long-term research by the outcome measured.
The Diabetes Prevention Program compared metformin, an intensive lifestyle intervention and placebo in people at elevated risk of diabetes. It measured the development of diabetes, a specific outcome in a specific population. That study provides important metabolic context. A claim about extending human lifespan would require a different endpoint, which is why the actual research question belongs in any explanation of metformin’s wider scientific interest.
Make an informed comparison
Compare the actual ingredients and formats.
Compare ingredient family, mechanism and format together. Metformin’s glucose-regulation pathway and ER oral tablet distinguish it from the injectable GLP-1 and dual GIP/GLP-1 products. The category name alone leaves those important differences out.
| Option | Ingredient identity | What distinguishes it |
|---|---|---|
| Metformin ER | Metformin | Biguanide; extended-release oral tablet |
| Semaglutide | Semaglutide | GLP-1 receptor agonist; injectable product |
| Tirzepatide | Tirzepatide | GIP / GLP-1 receptor agonist; injectable product |
The useful details
A few questions worth answering.
Does ER identify a different active ingredient?
ER means extended release. The active ingredient remains metformin; the release formulation differs. Reading the ingredient, the release designation and the listed strength separately gives a clearer picture of the actual tablet.
Is metformin another form of semaglutide?
They are different molecules in different medication families. Metformin is a biguanide; semaglutide is a GLP-1 receptor agonist. They also have different product formats in this catalog. A shared metabolic-care category does not make their pathways interchangeable.
Explore the ingredient research
Follow the sources.
See the available product options.
View optionsHealthRX.com verified facts
Metformin ER online: price and access
Metformin ER starts at $107 per month on 12-month plan; the lowest checkout charge is $134 (billed monthly). A prescription is never guaranteed. A licensed provider reviews each request before a pharmacy can dispense treatment.
Catalog verified August 26, 2026. Source: HealthRX.com checkout catalog and refund policy. Monthly equivalent divides the discounted plan charge by the number of months; checkout may collect a multi-month total.
A straightforward path to care
Select your plan
Choose your treatment options and complete secure checkout. Then complete the online health intake.
Provider review
A US-licensed provider reviews your history and, if appropriate, prescribes metformin ER off-label.
Ships to your door
Your metformin ships to your door in 3 to 5 days.
Ongoing support
Message your provider and adjust your dose over time.
- Provider review
- An independent US-licensed clinician reviews every request.
- Free, discreet shipping
- Filled by a US-licensed pharmacy and shipped in discreet packaging.
- Not prescribed?
- You get a full refund for the medication.
About Metformin ER
Metformin is one of the most-prescribed and best-understood medications in the world, and its effect on insulin sensitivity and metabolism has made it a fixture of longevity interest. The extended-release form is gentler on the stomach. Reviewed by a licensed provider, dispensed by a US-licensed pharmacy.
- Improves insulin sensitivity
- Extended-release, gentler on the stomach
- Decades of safety data
- Provider-reviewed, real pricing up front
Metformin reduces hepatic glucose output and improves insulin sensitivity, partly via AMPK activation. Dispensed by a US-licensed pharmacy.
Less glucose from your liver
Metformin reduces the amount of glucose your liver sends into your blood.
Better insulin response
Your muscle and fat cells take up glucose more efficiently.
Lower insulin load
With steadier glucose, your body needs less circulating insulin.
Steadier blood sugar and improved insulin sensitivity, the metabolic effects that put metformin at the center of longevity research.
What the research shows
Metformin has one of the deepest human evidence bases in medicine for blood sugar and insulin sensitivity. Its use for healthy aging is now being formally studied in the TAME trial, which is ongoing and has not yet reported. The results below reflect what large human trials have shown for metabolic outcomes, not for longevity.
31%
Lower risk of developing type 2 diabetes versus placebo over 2.8 years in 3,234 adults at high risk.
Knowler et al., New England Journal of Medicine, 2002
18%
Lower diabetes incidence versus placebo sustained across 10 years of follow-up in the same cohort.
Diabetes Prevention Program Outcomes Study, Lancet, 2009
Metformin ER or Immediate-release metformin
Why we prescribe the extended-release form
| Metformin ER | Immediate-release metformin | |
|---|---|---|
| How it is released | Slowly, over hours | All at once |
| Stomach upset | Less common | More common early on |
| Daily doses | Usually one | Two to three |
| Glucose lowering | Equivalent | Equivalent |
| Lowest cost | Slightly higher | Lowest |
| Best for | A simple, gentle routine | Cost-focused, tolerant stomachs |
What to expect
Some stomach upset is possible early and eases with the extended-release form and taking it with food. Your provider sets the dose.
Week 1 to 2
Start low
Begin at a low dose taken with food to ease your stomach.
Week 2 to 4
Titrate up
Your provider steps the dose up as you tolerate it.
Month 1 to 3
Settle in
Early stomach effects usually fade on the extended-release form.
Ongoing
Check in
Your provider reviews your labs and adjusts over time.
Safety and side effects
Reviewed by a licensed provider. Not used with significantly reduced kidney function (rare risk of lactic acidosis), and paused around contrast imaging or acute illness. Tell your provider about kidney function and alcohol use; B12 is monitored long term.
Common
- Nausea or upset stomach, usually early
- Diarrhea or loose stools
- Gas or bloating
- Metallic taste
Less common
- Lower vitamin B12 over time
- Reduced appetite
- Headache
Seek care
- Lactic acidosis, a rare buildup of lactic acid that is more likely with kidney or liver problems
- Low blood sugar when combined with other glucose-lowering medicines
Metformin is started low and taken with food to limit stomach effects. Your provider checks your kidney function and may monitor vitamin B12. Tell your provider about alcohol use and any kidney or liver conditions.
Frequently asked questions
What are metformin side effects?
The most common are digestive, especially early on. The extended-release form and taking it with food reduce this for most people.
Other longevity options
Everyday essentials for your routine.
No prescription needed. Dietary supplements for the daily habits around your care, sold separately from prescription treatment. Ask your provider before adding one to your routine.
Dietary supplements, not medications. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.
Approval is never automatic.
An independent US-licensed clinician reviews every request. If they decide the treatment is not right for you, you get a full refund for the medication.
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Prescriptions are filled by a US-licensed pharmacy and shipped free, in discreet packaging, on every plan.
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Compounded medications are prepared by a US-licensed pharmacy and are not reviewed by the FDA for safety or effectiveness. Products are dispensed only after a licensed provider determines they are appropriate. Information here is educational and is not a substitute for medical advice.