Metformin is one of the most widely prescribed medications in the world, and it comes up constantly in weight-loss conversations. Here is what it actually is, and is not, approved for.

An off-label use, stated plainly

Metformin is FDA-approved to manage blood sugar in adults (and children over 10) with type 2 diabetes. It is not FDA-approved for weight loss. When a provider prescribes it specifically to help with weight, that is an off-label use, a legal and common practice in medicine, but a meaningfully different starting point than a medication like semaglutide or tirzepatide, both of which carry a direct FDA weight-management approval under certain brand names. We’re stating this plainly here rather than glossing over it, because the approval basis is exactly the kind of thing worth knowing before you decide what to ask your provider about.

What the evidence shows

Metformin appears to support modest weight loss by improving insulin sensitivity and reducing how much glucose the liver produces. In a large clinical trial cited across multiple sources, participants taking metformin lost at least 5% of their body weight over a year, roughly 12.5 pounds for someone starting at 250 pounds. That is a real, measurable effect, but it is generally smaller than the weight loss seen with GLP-1 medications in their own trials. Metformin is sometimes used on its own, and sometimes alongside a GLP-1 medication, depending on what a provider determines is appropriate for a specific patient.

Who a Heally provider evaluates this for

Miracle Leaf® refers interested patients to Heally rather than making this determination itself. A Heally provider reviews your health history, current medications, and weight-related conditions, including whether you have prediabetes or type 2 diabetes, and decides whether metformin, alone or alongside another option, is appropriate for you. Cost is often part of that conversation too. Public self-pay pricing through Heally has included figures like a multi-month package rate for metformin, though pricing changes, so treat any specific number as a snapshot rather than a current guarantee and confirm directly with Heally.

How this compares to other options

If cost or a preference for a pill over an injection is driving your interest in metformin, it’s worth understanding that its average effect size is smaller than a GLP-1 medication’s. Our semaglutide, oral semaglutide, and tirzepatide pages cover those options in more depth so you can compare before your Heally evaluation.

Sources

• SingleCare, “How to get metformin prescription without diabetes,” for the off-label framing and clinical-trial weight figures referenced above
• Public product description, Heally (getheally.com/patients/metformin), pulled 2026-07-23

Medically reviewed by REVIEW LATER - named medical reviewer pending. Last reviewed 2026-07-23.