Is It Safe to Microdose GLP-1 Medications? What an Expert Says

So you’re thinking of trying a GLP-1 medication. Maybe for weight loss, diabetes or something else that the internet says they can help with.  

You’ve heard that microdosing GLP-1s — that is, taking less than the standard dose that’s been approved by the U.S. Food and Drug Administration (FDA) — can be a way to reduce potential side effects and save money.

But is microdosing safe? And is it actually effective, rather than just a waste of money? We asked a weight-loss and diabetes expert for her take.  

What GLP-1s are and how they work

First, a quick refresher: GLP-1 is short for GLP-1 receptor agonist. These are drugs that mimic GLP-1, a hormone the intestines release after eating. The hormone stimulates insulin production, inhibits the release of another hormone, glucagon, slows stomach emptying, and reduces appetite.  

Initially developed to treat diabetes, GLP-1s have also been FDA-approved to treat obesity, reduce the risk of serious cardiovascular events in people with heart disease, and treat sleep apnea in people with obesity.

“No other weight loss agent in the past has produced such profound weight loss as GLP-1 medications,” says Ellen Schur, MD, MS, an obesity medicine specialist at the UW Medicine Center for Weight Loss and Metabolic Surgery. “Losing just 5% of body weight can make a big difference for someone’s risk factors.”  

Should you microdose GLP-1s?  

A typical FDA-approved GLP-1 regimen involves starting off at a low dose, then gradually increasing over time to an optimal dose that is based on someone’s response to the drug, their current weight and their weight-loss goals. The process is tailored to each patient’s situation and how well they tolerate the medication. In general, the higher the dose, the more effective the drug is.

Since some people experience symptoms while starting or taking GLP-1s — mainly gastrointestinal side effects like nausea and vomiting, according to Schur — it makes sense that microdosing is an appealing alternative. However, taking small doses of the drugs without ever increasing has not been rigorously studied, and the approach has not been approved by the FDA.  

“Some of the microdosing regimens are below the lowest tested and published doses that we have any evidence about, and some of the health issues they are being promoted for (such as inflammation) are untested,” says Schur.

That means that doctors don’t know whether microdosing is effective, so it could be a waste of your money. Since GLP-1 medications are generally safe, you can assume that smaller doses are probably safe, too, but there are no guarantees since microdosing regimens have not been studied.

However, if you’re microdosing from an injectable by only using part of it and then saving the rest for your next dose, you could actually be causing more symptoms than if you took the medication as prescribed because your dose might not be as consistent.  

Similarly, if you’re considering getting smaller doses from a compounding or online pharmacy, be aware that these medications are not strictly regulated by the FDA, so there are additional safety risks.  

That means if you’re interested in microdosing a GLP-1, you should talk with your doctor about it rather than trying it on your own.  

Whether microdosing is helpful for some people is a question worth asking, and something that should be studied more, Schur says. Since GLP-1s can be expensive, being able to take smaller amounts could give some people access to the medications that they wouldn’t otherwise have.  

“The newest agents are oral medications, and some have a much simpler manufacturing process, which could lower the price point for some folks and improve availability,” Schur says.

How to minimize GLP-1 side effects

There is no way to know if taking a GLP-1 will give you side effects. Some people struggle with side effects, but not everyone does.  

In general, you’re more likely to experience side effects within the first 12 to 24 hours after taking your weekly dose. As the week goes on, your symptoms should lessen.  

By avoiding certain foods and paying close attention to early signals of fullness, some people can effectively manage these symptoms, Schur says.  

Working closely with your doctor is key. If increasing the medication is making you feel lousy, they can put you on a slower progression and see if that does the trick.  

And if going slower still isn’t working, your doctor may decide to keep you on a lower dose if you aren’t tolerating dose increases.  

“In those situations, we can use a maximally tolerated dose. It’s always a discussion with the patient about what the benefit is and how much data we have about its efficacy,” says Schur.

The bottom line

Researchers don’t know if microdosing GLP-1s is safe or effective, so if you’re interested in trying it, talk with your doctor first. If you’re concerned about cost or side effects, they can help come up with a plan that will take those things into consideration.