Dealing With Constipation on GLP-1 Medications? Here Are 13 Products That Can Help
And that's not all. Because you're not eating as much, you may not be getting the fiber you need to bulk up stool and keep things moving smoothly, which can also lead to constipation (especially if you're also not drinking enough fluids), says Hamilton.
Fortunately, there are plenty of over-the-counter products that can help with GLP-1 constipation. From fiber supplements to osmotic laxatives and probiotics, here are our favorite products for managing constipation on GLP-1s.
When To Consult a Doctor
While occasional constipation is common and typically not a cause for concern, persistent constipation that significantly impacts your quality of life should be addressed by your doctor, particularly if you've tried over-the-counter remedies like fiber supplements and osmotic laxatives without success.
Additionally, if you're experiencing severe abdominal pain, persistent nausea and vomiting, blood in your stool, or excessive weight loss, it's important to see a doctor to rule out more serious causes of your symptoms, like inflammatory bowel disease (IBD) or colorectal cancer.
Trying to Stay Regular on GLP-1s? Fiber Supplements to Add to Your Routine

If you're not getting anywhere close to that, it's important to start slowly to avoid side effects like gas and bloating. I typically recommend increasing your fiber intake by 2 to 3 grams per day until you reach your goal. It's also important to spread your fiber intake evenly throughout the day.
However, because GLP-1s reduce your appetite, eating a lot of high-fiber foods (which are naturally satiating) can be a challenge. That's where fiber supplements come in. There are several different types of fiber supplements available, but the three below are my favorites.

Psyllium
Viva Naturals Psyllium Husk
There are plenty of psyllium husk supplements available, but many are gritty and difficult to mix. I recommend Viva Naturals Psyllium Husk because it's ground into a fine powder that mixes easily into smoothies, oatmeal, yogurt, or even plain water (though it has a very "earthy" flavor, so I typically recommend mixing it into something that masks the taste). It also works well in baked goods like muffins and is a great way to sneak extra fiber into foods that would otherwise be relatively low in fiber. And at just over $20 for 136 servings, it's very reasonably priced.

Partially Hydrolyzed Guar Gum
Tomorrow’s Nutrition Sunfiber
Tomorrow's Nutrition SunFiber is my go-to PHGG supplement because it's unflavored, well-researched, and low-FODMAP (making it a great choice for people with IBS). While it's a bit pricier than psyllium-based fiber supplements, it's a solid choice if you're looking for an effective fiber supplement you can't taste.

Prebiotics
LOAM Prebiotic Fiber Formula
But what I love most about this prebiotic supplement is that it doesn't cause gas or bloating like most others I've tried. That said, each serving contains 10 grams of fiber, so I recommend starting with half a serving and gradually increasing to a full serving once your body has had a chance to adjust to the additional fiber.
When Fiber Isn't Enough: Osmotic Laxatives to Know About


Miralax
When you think of laxatives, there's a good chance that Miralax is the first one that comes to mind. It's unflavored and is made of a grit-free powder that dissolves completely in hot or cold liquid. Because it's a non-stimulant laxative, it's much less likely to cause uncomfortable abdominal cramping like stimulant laxatives can.
Miralax is affordable and widely available, and is FSA/HSA eligible depending on your plan. If you're taking GLP-1 medications, I recommend keeping a small container of Miralax (the smallest size available provides seven doses) on hand for dealing with occasional constipation.

Clearlax by Amazon Basics
While I typically recommend Miralax due to its wide availability, if you can wait a few days, Clearlax by Amazon Basics is a great, budget-friendly option. At under $20 for 45 doses, it's significantly cheaper than Miralax, making it a good choice if you're dealing with ongoing constipation and frequently need a laxative.
Clearlax contains the same active ingredient as Miralax (PEG 3350) and generally produces a bowel movement within 1 to 3 days. The powder is unflavored and dissolves well in any liquid. It's also sugar- and gluten-free.
No, Magnesium Isn't Just for Sleep—It Can Also Get Things Moving

If you're incorporating magnesium into your routine to help with constipation, Hamilton recommends taking it at night, which often leads to a morning bowel movement. She adds that magnesium citrate is typically considered the best option for constipation. While the laxative effects of magnesium are typically seen at doses of around 400 milligrams, Hamilton recommends starting lower, around 200 milligrams, to reduce the risk of diarrhea. Like fiber, it’s best if you add magnesium to your routine using a "low and slow" approach, with gradual adjustments based on how your body responds.

Powdered Magnesium
Natural Vitality Calm Magnesium Citrate
For an added constipation-relieving effect, I recommend mixing the powder with hot water. Warm liquids can have a stimulating effect on the bowels, so drinking this magnesium powder like a cup of tea may enhance its constipation-relieving properties.

Magnesium Gummies
Nature's Bounty Magnesium Gummies
If you'd prefer to take your magnesium in gummy form, I recommend Nature's Bounty Magnesium Citrate Gummies. They contain 270 milligrams of magnesium per 3-gummy serving. Because each gummy contains 90 milligrams of magnesium, it's easy to adjust the dosage to your individual needs.
These gummies are raspberry-flavored and, unlike many gummy vitamins, don't contain gelatin, making them suitable for people following a vegan or vegetarian diet. They do contain 4 grams of added sugar per serving, so if you're watching your sugar intake, the softgels below may be a better option.

Magnesium Softgels
Nature Made Magnesium Citrate
If you don't want to taste your magnesium supplement, these easy-to-swallow magnesium citrate softgels from Nature Made are a great option. At around $15 for 60 servings of two softgels, they're relatively affordable, and with 125 milligrams of magnesium per softgel, adjusting the dosage is easy.
However, keep in mind that these softgels contain gelatin, so they're not suitable for people following a vegan or vegetarian diet.
Looking At Probiotics For Constipation Relief? Start Here


Align Gut Health & Immunity Support

MIOME IB-ONE
If you experience painful bowel movements and abdominal pain along with constipation, MIOME IB-ONE could be a good option. It contains Bacillus coagulans Unique IS-2, another probiotic strain shown to help with constipation. A 2020 study found that, compared to a placebo, people taking B. coagulans Unique IS-2 had significantly more bowel movements.
Support Your Gut's Natural Rhythm By Staying Hydrated


Liquid IV Hydration Multiplier Sugar-Free
While many electrolyte supplements contain sugar to help with absorption, people taking GLP-1s for either weight loss or diabetes management may wish to avoid excess sugar in their diet. If you're looking for an electrolyte supplement that's sugar-free, comes in a wide variety of flavors, and contains both sodium and potassium, Liquid IV Hydration Multiplier (Sugar-Free) is a great choice. It comes in convenient stick packs that you can toss in your gym bag or take with you on vacation.

Be LOVE Balanced Electrolyte Drink

LifeStraw Go Series Insulated Stainless Steel Water Bottle
Keeping a water bottle with you throughout the day can be a good way to remind yourself to drink water, especially when paired with app reminders. Editor Nicole Bonaccorso tested the LifeStraw Go Series Insulated Stainless Steel Water Bottle for two weeks and enjoyed the clean, fresh taste of the water, which passes through a filter before it reaches your mouth. At 18 ounces, it's a size that holds enough water without becoming too heavy, and because it keeps water cold for several hours, you don't have to drink it all at once. This water bottle also looks nice, comes in several different colors, and has a handle, making it easier to carry. Plus, it's made from aluminum, making it great for everyday use.
Why Do GLP-1 Medications Cause Constipation?
There are several reasons GLP-1 medications can cause constipation. GLP-1 medications mimic the action of glucagon-like peptide-1, a naturally occurring hormone. Hamilton explains that this hormone plays an important role in regulating our appetite and blood sugar levels. Part of how they do this is by slowing stomach emptying so food stays in our stomach longer.
But that's not the only reason GLP-1 medications can cause constipation. "Constipation from GLP-1s can be compounded by the fact that people are eating less," says Hamilton, "resulting often in less fiber consumption and less stool bulk overall." Many people also drink less fluid to avoid feeling overly full on GLP-1 medications, which can also lead to constipation.
Why "More Fiber" Isn't Always The Answer on GLP-1s
While soluble fiber such as psyllium husk can be an effective treatment for constipation, there are a few considerations to keep in mind. First, go "low and slow." Adding too much fiber too quickly can increase your risk of side effects like gas and bloating. Some people find they tolerate fiber supplements better when taken with a meal.
Tips For Introducing Supplements
If you're experiencing constipation while taking GLP-1 medications, it's best to consult your doctor or dietitian before starting any new supplements to ensure they're suitable for your specific needs.
If you're unable to consult with a healthcare professional, start with one supplement at a time so you can accurately assess whether it's helpful for you. Also, when it comes to supplements like psyllium or magnesium, start with a low dose and gradually increase to reduce the likelihood of side effects.
Finally, if you're taking any other prescription medications, it's always best to consult a physician or pharmacist before starting supplements, as some over-the-counter supplements can interact with prescription medications.
What To Do When Supplements Aren't Enough
While supportive strategies, such as appropriate laxatives or supplements, as well as optimizing fluid and fiber intake, can help with gastrointestinal symptoms, not everyone fully "adjusts," says Hamilton. If your constipation worsens as you increase your dose, Hamilton recommends talking to your doctor. For some people, staying at the same dose for a few weeks before increasing may give the digestive system more time to adapt and reduce the intensity of side effects like constipation, nausea, or bloating, says Hamilton.
Additionally, if you're experiencing symptoms such as persistent abdominal pain, blood in your stools, excessive weight loss, or any symptoms that significantly interfere with your day-to-day activities, it's important to speak with your prescribing physician, as you may need to temporarily reduce your GLP-1 dose and be screened for more serious causes of your symptoms, such as IBD or colorectal cancer.
What To Avoid
While full supplement avoidance will depend on the person, Hamilton recommends considering whether any of the supplements you're taking could be worsening your constipation. For example, some oral iron or calcium supplements can reduce stool water content, leading to slower, harder bowel movements, says Hamilton.
Additionally, "some herbal or 'natural' remedies for constipation, like aloe, cascara, or senna-based products are stimulant-based," says Hamilton, "meaning they work by causing the intestines to contract more forcefully." While these supplements can be effective for short-term relief, Hamilton warns that frequent use can lead to cramping, diarrhea, or dependence. In general, stimulant-based supplements should only be used occasionally and ideally with professional guidance.
It's also important to consider that more is not necessarily better when it comes to supplements for GLP-1-related constipation. For example, extremely high doses of magnesium are more likely to cause diarrhea, while large doses of fiber without adequate fluid can actually worsen constipation and make stool harder to pass. Whenever possible, it's best to work with a healthcare professional before starting new supplements or changing doses, says Hamilton.
Common Questions About Constipation and GLP-1s
Yes, fiber supplements can worsen constipation on GLP-1s, especially if you add a large dose all at once or don't drink enough fluids. If you're extremely constipated, it's best to talk with your doctor about using a laxative (such as an osmotic laxative or suppository) to remove the trapped stool. Once the stool has cleared, you can gradually add fiber to help prevent future constipation.
The dose of magnesium required for a laxative effect is often around 400 milligrams, but it can vary between individuals. Hamilton recommends starting at around 200 milligrams to see how your body responds and to reduce the risk of diarrhea. If 200 milligrams isn't enough, you can slowly increase the dose until a laxative effect is achieved.
How long GLP-1-related constipation lasts largely depends on the dose and the individual, says Hamilton. While it tends to be more common during the initial dose-adjustment period, it can persist for several months in some people. Adding supportive strategies early, such as laxatives or supplements, along with optimizing fiber and fluid intake, can be helpful. If constipation worsens during dose escalation, Hamilton recommends talking to your prescribing physician. In some cases, staying at the same dose for two to four weeks before increasing may reduce the intensity of digestive side effects, including constipation.
The timing of supplements for GLP-1 constipation depends on the supplement, says Hamilton. It's typically recommended that you take magnesium supplements in the evening to produce a morning bowel movement. PEG 3350 can be taken at any time, but Hamilton recommends taking it at the same time each day to produce more predictable bowel movements. Fiber supplements can also be taken any time of day, but taking them with meals can improve tolerance and make them more effective, says Hamilton. With all of these approaches, staying well-hydrated is essential to help the supplements work effectively, she adds.
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