If you're taking a GLP-1 medication such as semaglutide (Ozempic, Wegovy) or tirzepatide (Mounjaro, Zepbound), you've probably noticed the trade-offs. Nausea, diarrhea, vomiting and constipation are among the most common side effects, and eating much less can make it harder to get enough protein and nutrients. Supplements don't replace your care team, but four of them can help fill the gaps while you're on treatment.
Why your body needs extra support on a GLP-1
GLP-1 medications act on the brain to reduce hunger and slow how quickly your stomach empties, so you feel full longer and eat less. That's how they lead to weight loss, but it creates a few challenges. A joint advisory from four obesity and nutrition societies lists the main ones: digestive side effects, nutrient shortfalls from eating less, and loss of muscle and bone.
The muscle concern: Some of the weight you lose is lean mass, not fat. In a meta-analysis of 22 trials, lean mass made up about 25% of the weight lost on GLP-1 medications, with the most potent drugs among the least effective at preserving it. Enough protein and regular strength training are the main tools for holding on to muscle.
The nutrient gap: Smaller portions mean fewer vitamins and minerals, especially if your appetite is very low.
The hydration risk: Vomiting and diarrhea can dehydrate you, and the prescribing information for semaglutide warns that dehydration from these side effects can lead to kidney problems.
1. Plant protein powder: protect your muscle
When nausea and a small appetite make meals hard, a protein shake is one of the easiest ways to keep your intake up. Research on weight management supports about 1.2 to 1.6 grams of protein per kilogram of body weight a day, or roughly 25 to 30 grams per meal; your doctor or dietitian can set the right target for you.
Does plant protein work as well as whey? For building muscle alongside training, a meta-analysis of randomized trials found that protein source made no difference to absolute lean mass or strength, with a small edge for animal protein on percent lean mass in younger adults. Plant protein is also a good option if dairy bothers your stomach.
Try it: So Lean & So Clean has 23 grams of organic pea and rice protein per serving, no added sugar and no gums, plus a digestive enzyme blend. Shake it with plant milk or blend it into a smoothie, and pair it with strength training two or more times a week.
2. A multivitamin: your nutritional safety net
When you're eating smaller portions, a daily multivitamin is simple insurance against gaps. The Modern Multi provides 20 essential nutrients in bioavailable forms, including support for eyes exposed to blue light from screens. Take two capsules with food, ideally with your largest meal, to help absorption and reduce the chance of an upset stomach.
3. A probiotic: support for your gut
Constipation is one of the most common complaints on GLP-1 medications. Probiotics haven't been tested specifically in people taking these drugs, but in a meta-analysis of adults with functional constipation, multispecies probiotics improved stool frequency, consistency and bloating.
What to look for: several strains, including Lactobacillus and Bifidobacterium. Trust Your Gut Daily Essential has 16 billion CFU from six acid-resistant strains plus organic prebiotics. Take two capsules at the same time each day, with food.
4. Electrolytes: stay hydrated
Hydration is easy to overlook when you're not hungry or thirsty. Sip water throughout the day, and if you're dealing with vomiting or diarrhea, replace minerals as well as fluid. Thirst Aid provides four key electrolytes (sodium, potassium, magnesium and calcium); note that each serving also contains 5 grams of organic coconut sugar. If you can't keep fluids down, contact your doctor.
A simple daily routine
- With breakfast: your probiotic, taken with food.
- With your largest meal: your multivitamin.
- Around workouts or as a snack: a protein shake.
- Throughout the day: water, plus electrolytes if you've had GI symptoms.
Not taking a GLP-1 medication?
Your body makes GLP-1 on its own, and food choices influence it; see how to support your natural GLP-1. GLP-1 Up is a dietary supplement with four patented ingredients designed to support your body's own GLP-1 production and a healthy blood sugar response; here's how it works. It is not a substitute for prescription medication, and if you are taking a GLP-1 medication or diabetes medication, ask your doctor before adding it.
The bottom line
GLP-1 medications are powerful tools, and they work best with good nutrition behind them: enough protein, regular strength training, a basic nutrient safety net, gut support and steady hydration. Those habits matter after treatment too. In the STEP 1 trial, people who stopped semaglutide regained about two-thirds of the weight they had lost within a year. Keep your healthcare provider in the loop about every supplement you take.
