Best Supplements to Take on GLP-1 Medications: A Guide to Protein, Fiber, and Vitamins
One of the questions I hear most often from patients and fellow clinicians is: “Do I need supplements while taking a GLP-1 medication such as Ozempic, Mounjaro, Zepbound, or Wegovy?”
The answer isn’t a simple yes or no. It depends largely on the quality and quantity of food someone can eat during treatment.
GLP-1 medications are not inherently nutrient-depleting, but a reduced appetite and changes in food intake and body composition can increase the risk of nutritional gaps. Let’s examine the evidence to determine who may benefit from supplements—and which ones may be worth considering.
Start With Food, Then Identify What’s Missing
As a dietitian and a lover of food, I will always take a food-forward approach. Food is community and culture. It is healing, family, and joy. It grounds us in daily routines, and even medications that suppress appetite or reduce our drive to eat do not erase the deeply personal role food plays in our lives.
At the same time, I recognize how significantly GLP-1 medications can affect our ability to eat. Our bodies still have basic nutritional and metabolic needs, even when hunger is reduced. When food alone is not enough, supplements may help address missed meals, low protein intake, constipation, or a diagnosed nutrient deficiency.
Protein Powder or Shakes for Days You Struggle to Eat Enough
Evidence-based nutrition guidelines commonly recommend approximately 1.2–1.6 grams of protein per kilogram of body weight per day during weight loss. You may also see 100 grams per day suggested as a general minimum, but protein needs are highly individual and depend on factors such as body size, age, activity level, health history, and weight-loss goals.
When reduced appetite makes full meals difficult, protein powders and ready-to-drink shakes can offer a convenient way to fill the gap. Whey and plant-based proteins can both be good options. The best choice is one that meets your nutritional needs, agrees with your digestive system, and fits your preferences.
Here are a few products I have personally used and recommended to clients:
Remember that protein is only one part of protecting lean mass. Adequate protein intake and regular strength training work together to help maintain muscle during weight loss.
Fiber Supplements for Constipation or Low Fiber Intake
Gastrointestinal side effects are among the most commonly reported concerns when starting a GLP-1 medication or increasing the dose. Staying well hydrated and eating fiber-rich foods, including fruits, vegetables, whole grains, flaxseed, chia seeds, and psyllium husk, may help support regular bowel movements. A general goal is about 25–38 grams of fiber per day, although individual needs can vary.
If constipation persists, a fiber supplement may be helpful. Here are a few products I have personally used and recommended to clients:
Increase fiber gradually and drink enough fluid to reduce the likelihood of bloating or discomfort. Talk with your clinician about persistent or severe constipation rather than trying to manage it indefinitely with supplements.
A Multivitamin—or Specific Vitamins—When There’s a Gap
A general multivitamin may be worth considering as a nutritional safety net, especially when food intake is limited or nutrients such as calcium, vitamin B12, and folate are consistently lacking.
Keep in mind that a multivitamin may not meet every nutritional need. Some nutrients may be included only in small amounts, while others may require separate, carefully timed supplementation. A more personalized approach with a registered dietitian can help identify what you actually need.
Here are a few products I have personally used and recommended to clients:
Remember, GLP-1 medications do not automatically cause nutrient deficiencies. The concern is that a reduced appetite and lower food intake can make it harder to consume enough nutritious food.
High-dose vitamins are also unlikely to improve weight-loss results. Their purpose is to correct or prevent specific nutritional deficiencies—not to accelerate weight loss.
Supplements to Skip or Use With Extra Care
Be cautious with products that promise to “boost GLP-1,” increase fat burning, or accelerate weight loss. These supplements are often expensive blends that rely heavily on caffeine or other stimulants, and their claims may not be supported by strong evidence.
Supplements can also cause side effects and interact with medications. Before adding one, discuss it with the clinician prescribing your GLP-1 therapy—especially if you have a medical condition or take other medications.
The best supplement is one that addresses an identified need, has evidence supporting its use, and is appropriate for your individual health situation.
Frequently Asked Questions
Not automatically. Consider one if you’re regularly eating too little to meet your nutrient needs.
Generally, yes. It can help when you struggle to get enough protein from meals.
Fluids, fiber-rich foods, and gradually adding a fiber supplement may help. Ask your clinician about persistent constipation
Usually, water is enough. Ask your clinician if vomiting or diarrhea makes it hard to stay hydrated.
They don’t automatically cause deficiencies, but eating much less may leave nutrient gaps.
Some people find ginger helpful, but ongoing or severe nausea needs medical advice.
Ready to Strengthen Nutrition Services in Your Practice?
Are you looking to build, refine, or expand nutrition services within your practice? I offer flexible, consultative support designed to meet the needs of busy clinics and healthcare organizations.
Nutrition is central to my work across prevention and chronic disease management. My approach focuses on translating evidence into clear, practical strategies that help patients understand not only what to do, but why it matters for their health.
Let me help you develop patient-centered nutrition services that integrate seamlessly into clinical care. Book a discovery call to explore how we might work together.
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