If you or someone you love is taking a GLP-1 medication - names you've probably heard, like Ozempic, Wegovy, Mounjaro, or Trulicity - you've likely noticed one of their most powerful effects: they really do quiet your appetite. For people managing type 2 diabetes or working on weight loss, that's exactly the point.
But here's a question that doesn't always come up at the doctor's office: when you're eating less, are you still getting all the vitamins and minerals your body needs? The honest answer is, sometimes not. And it's worth a closer look, because filling those gaps the right way can make a real difference in how you feel day to day.
GLP-1 medications work by slowing digestion and reducing appetite. They're typically prescribed alongside a reduced-calorie, lower-fat eating plan. The combination is effective - but eating less food naturally means taking in fewer of the nutrients that food provides.
There's another wrinkle to consider. People who already live with obesity or type 2 diabetes are at higher risk for certain vitamin deficiencies to begin with. Add a medication that further reduces how much you eat, and that risk can grow.
A recent study also found that GLP-1 medications may interfere with how well your body absorbs iron. And if you've experienced any of the common digestive side effects - nausea, vomiting, or diarrhea - those can deplete important minerals like magnesium and potassium even further.
Doctors and pharmacists who work with GLP-1 patients commonly keep an eye on the following:
This is the most important piece of advice in this whole article. Before you start adding supplements to your daily routine, ask your doctor for a simple blood test. There's no point spending money on vitamins you don't need, and taking too much of certain ones can actually cause its own problems.
Your doctor can tell you exactly which nutrients you're low in, recommend the right dose, and often suggest food sources first. Iron, for example, can be boosted with seafood, red meat, or dark poultry. Vitamin A is plentiful in carrots, sweet potatoes, and spinach. Whenever possible, food is the better delivery system.
As pharmacist Philip Ngo, PharmD, puts it: "Currently, there are no formal recommendations for a multivitamin or supplement while on medications, including GLP-1s. It is more ideal that people receive their daily nutrients from their diet rather than from supplements. If you are deficient in a certain vitamin or mineral and are not getting enough from diet, then a supplement may be beneficial."
In other words: food first, supplements second, and only when you actually need them.
This is just as important as knowing what to add. A few categories of supplements should be avoided - or at the very least, discussed with your doctor before you take them.
Other weight-loss supplements are at the top of the "do not mix" list. This includes products containing ephedra, green tea extract, or garcinia cambogia. These can further suppress your appetite when it's already reduced, raising your risk of nutrient deficiencies. And the truth is, we simply don't know yet whether they're safe to combine with prescription weight-loss medications.
Calcium supplements also deserve a careful conversation with your doctor. Studies have shown that some people on GLP-1 medications develop higher-than-normal calcium levels. Adding a supplement on top of that could push your levels too high, which carries its own risks. If you've been taking calcium for years to support your bones, don't stop on your own - but do bring it up at your next appointment.
GLP-1 medications can be life-changing for managing diabetes and weight, but eating less means it's worth paying closer attention to what's missing from your plate. The best approach is the simplest one: eat the most nourishing foods you can, get a blood test from your doctor, and take supplements only when you actually need them - and only the ones that are safe to combine with your medication.
Your medication is doing important work for your body. A few thoughtful conversations with your doctor will make sure your nutrition is, too.
