The GLP-1 supplement stack

Losing weight is the easy part. Staying strong while you do it takes a plan.

GLP-1 medications work by shrinking your appetite — which means it's surprisingly easy to under-eat, lose muscle and bone along with the fat, and run low on the nutrients your body needs. This is the checklist of what to eat, take, and do to lose weight the healthy way, with honest picks for each — and a clear list of what to skip.

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By the GLP Index editorial team · Updated July 24, 2026

How to read this

  • The order is the priority. The stuff at the top — training, protein, eating enough — matters more than anything you can buy. Get those right before worrying about the rest.
  • Food first, supplements to fill real gaps. No pill or powder has been proven to make a GLP-1 work better. The point is protecting your health, not boosting the drug.
  • We make money from some links, and it never changes what we recommend. Product picks point to the maker's site as a starting place — research your own best option and check with your prescriber first.

Start here

The foundation — this beats any pill

None of the supplements further down matter as much as these five. They're free (or nearly), they're the best-proven things on this page, and they're what actually keep the weight you lose coming off as fat instead of muscle and bone.

Strength training

Do this first
What you need
Lift something heavy at least 2–3 times a week — bands, dumbbells, machines, or your own bodyweight all count. Full-body sessions beat fancy split routines when you're starting out.
Why it matters
Some of the weight you lose on a GLP-1 comes from muscle, not just fat — and these drugs can quietly pull down bone density too. Strength training is the single most reliable way to hold on to muscle, and the only thing proven to actually build bone back.
If you skip it
You lose more muscle and bone than you need to. That drags down your metabolism, leaves you weaker, and makes the weight easier to regain later. Walking is great, but on its own it won't protect muscle or bone.
  • Aim for 2–3 short sessions a week — even 20 minutes counts. Start the day you start the medication; muscle is far easier to keep than to rebuild.
  • Cover the big movements: a squat or sit-to-stand, a push (push-up or press), a pull (row), and a hinge (picking things up off the floor).
  • Add ~150 minutes of walking or easy cardio a week on top — good for your heart and mood, just not a substitute for lifting.
  • On low-energy days, do less rather than nothing. Consistency matters more than intensity.

Protein

Non-negotiable
What you need
Roughly 80–120 grams a day (about 0.5–0.7g per pound of your goal weight), spread across meals — aim for 20–30g each time you eat.
Why it matters
When your appetite drops, protein is the first thing most people fall short on — and it's the raw material your body uses to hold on to muscle while you lose fat. It also keeps you full and supports your hair and skin.
If you skip it
More of your weight loss comes from muscle. You're also more likely to feel tired and run-down, and low protein is one of the reasons some people notice extra hair shedding a few months in.

Options to look into

Whey — easy on the wallet $
Optimum Nutrition Gold Standard 100% Whey A reliable, widely available whey with ~24g per scoop. The default starting point if dairy sits fine with you. Look into this
Clear whey — light & fruity $$
Isopure Clear Whey Protein Mixes thin and juice-like instead of thick and creamy — much easier to get down when shakes feel heavy or you're queasy. Look into this
Plant-based — dairy-free $$
Orgain Organic Plant-Based Protein A solid pea-and-brown-rice blend if you avoid dairy. Use a slightly bigger scoop — plant protein is a touch less efficient than whey. Look into this
Ready-to-drink — no mixing $$$
Core Power Protein Shakes A cold, grab-and-go bottle with 26–42g. The most practical option on days when solid food is a struggle. Look into this

Eating enough (and losing at a steady pace)

What you need
A moderate calorie cut, not a crash. As a floor, most people shouldn't drop below roughly 1,200 calories a day (women) or 1,800 (men) without a clinician's guidance.
Why it matters
These drugs work by killing your appetite, so the real risk isn't overeating — it's quietly eating far too little without feeling hungry. Losing weight fast and eating almost nothing is what turns healthy fat loss into muscle loss, bone loss, fatigue, and hair shedding.
If you skip it
Losing too fast on too little food costs you muscle and bone, tanks your energy, and makes you more likely to fall short on nutrients across the board. Slower, steadier loss holds on to more of the good stuff.
  • Check in on your intake now and then — people badly underestimate how little they're eating on these drugs.
  • Eat your protein first at each meal, and lean on shakes or smoothies on days solid food won't go down.
  • If you're losing weight very fast or feel wiped out, cold, or weak, that's a sign to eat more — and worth raising with your prescriber.

Water & electrolytes

What you need
Aim for around 2–3 liters (8–12 cups) of fluid a day, and drink on a schedule rather than waiting to feel thirsty.
Why it matters
GLP-1s blunt your thirst and cut how much water you get from food, and any vomiting or diarrhea drains fluids fast. Dehydration is a big part of the "Ozempic flu" — the run-down, headachy, nauseous feeling people get, especially when moving up a dose.
If you skip it
You feel more tired, headachy, and nauseous, and dehydration can make constipation worse. In rare cases severe dehydration can strain the kidneys.

Our pick

Sugar-free — for when you're losing fluids $$$
LMNT Electrolyte Drink Mix Handy during vomiting, diarrhea, heavy sweating, or days you can barely eat. You do NOT need one daily — plain water plus meals covers most people. Skip the sugary sports drinks. Look into this

Sleep

What you need
7–9 hours on a consistent schedule.
Why it matters
It's the most overlooked lever here. Short sleep cranks up hunger hormones and works against the appetite control the drug is giving you — and in studies, people who skimped on sleep while dieting lost more muscle and less fat.
If you skip it
Cravings creep back, workouts and recovery suffer, and you lose more muscle for the same amount of weight dropped.
  • Keep a steady bed and wake time, even on weekends.
  • Cool, dark room; ease off screens and late alcohol.
  • If constipation cramps or restlessness keep you up, magnesium (further down) can pull double duty.

Fill the gaps

Vitamins & minerals worth covering

Eating a lot less food means it's easy to run low on specific nutrients. Food comes first — but where a gap is common and hard to close with a shrinking appetite, a targeted supplement is cheap insurance. One honest note up front: no vitamin has been proven in a trial to improve results for people on GLP-1s. The point is filling real shortfalls, not chasing a boost.

Vitamin D3

What you need
About 1,000–2,000 IU a day, taken with a meal that has some fat. If you can, get your level checked and let that guide the dose.
Why it matters
Vitamin D needs dietary fat to absorb — and you're eating less of everything. It also helps your body use calcium to protect bone during the rapid weight loss these drugs cause. It's the single most commonly low nutrient in this group.
If you skip it
Low vitamin D means your body can't make the most of the calcium you do get, right when your bones are under the most stress.

Our pick

D3 — third-party verified $
Nature Made Vitamin D3 2000 IU Cheap, USP-verified, and the exact dose most people need. A D3-plus-K2 version is a fine upgrade but not essential. Look into this

Vitamin B12

What you need
A 500–1,000 mcg tablet or lozenge daily. Ideally check your level first, especially if you also take metformin.
Why it matters
B12 comes mostly from meat, fish, eggs, and dairy — exactly the foods that get harder to eat. Slowed digestion makes it tougher to absorb too, and low B12 causes fatigue, brain fog, and tingling that people often blame on the drug itself.
If you skip it
Deficiency creeps up as fatigue, low mood, and pins-and-needles — and it's completely avoidable with a cheap, safe tablet.

Our pick

Methylcobalamin — dissolves under the tongue $
Jarrow Formulas Methyl B-12 A well-made, inexpensive B12 in an easy-to-absorb form. (B12 does not help you lose weight — ignore the "B12 shot for weight loss" marketing.) Look into this

Iron

Test first
What you need
Only supplement iron if a blood test shows you're low. If you are, a gentle form taken every other day with vitamin C works best.
Why it matters
People on GLP-1s show higher rates of low iron — from eating less of it and absorbing less. It matters most if you have periods, are vegetarian, or donate blood.
If you skip it
Genuinely low iron leaves you exhausted and can worsen hair shedding. But the flip side matters too: taking iron you don't need can cause harm and makes nausea and constipation worse — so this one is test-first, always.

Our pick

Gentle iron — if labs say you're low $$
Thorne Iron Bisglycinate A "gentle" form that's easier on the stomach than standard iron. Take it every other day with a glass of orange juice, away from coffee and calcium. Look into this

Calcium

What you need
Around 1,000–1,200 mg a day from food and supplements combined — food first. If you top up, keep each dose to 500 mg or less.
Why it matters
Less dairy and less food means less calcium, right when rapid weight loss is stressing your bones. Think of calcium as the building material — the thing that actually builds bone is the strength training up top.
If you skip it
Without enough calcium coming in, your body pulls it from your bones. (Honest caveat: calcium plus vitamin D isn't proven to prevent fractures on its own — it's there to cover a gap, not as a magic bone shield.)

Our pick

Calcium citrate — absorbs without stomach acid $
Citracal Petites (Calcium Citrate) Citrate is the better form when you're eating less or on acid-reducing meds. Only use it to fill the gap between what food gives you and ~1,000–1,200 mg. Look into this

Magnesium

What you need
Roughly 200–400 mg of a well-absorbed form. Pick the type by what you need it for.
Why it matters
Magnesium runs low in most people to begin with, and eating less makes it worse. It's unusually useful here because it helps with three GLP-1 annoyances at once: constipation, muscle cramps, and sleep.
If you skip it
You miss an easy, low-cost fix for constipation and cramps. (Just don't buy it for "bone" claims — the evidence there is weak.)

Options to look into

Glycinate — sleep, cramps, everyday $
Doctor's Best Magnesium Glycinate Gentle on the stomach and won't send you to the bathroom. The pick for cramps, sleep, and general topping-up. Take it in the evening. Look into this
Citrate — when constipation is the problem $
NOW Magnesium Citrate Draws water into your gut, so it helps things move — the better choice if constipation is your main complaint. Skip cheap "magnesium oxide," which is poorly absorbed. Look into this

A daily multivitamin

What you need
One complete, third-party-tested multivitamin a day, with food. Women who still have periods should pick one with iron; everyone else usually wants one without.
Why it matters
When you're eating much less, a multivitamin is a cheap safety net that covers a bunch of the easy-to-miss nutrients — zinc, B12, vitamins A/C/E/K — in one go, so you're not managing a shelf of bottles.
If you skip it
You're more likely to run low on several nutrients quietly at the same time. A multivitamin is a floor, not a fix — it doesn't replace protein or strength training.

Options to look into

With iron option — third-party tested $$$
Ritual Essential for Women / Men Clean, well-tested, and easy on an empty-ish stomach. The women's version includes iron; there's a men's/50+ version without. Look into this
No added iron — NSF certified $$$
Thorne Basic Nutrients (iron-free) A thorough, tightly-tested multi without iron — the right default for men and post-menopausal women, who shouldn't add iron blindly. Look into this

Worth adding

Supplements that earn their place

Past the basics, three add-ons have a real case — as long as you're already doing the foundation. These aren't magic, but the risk is low and the upside is legitimate.

Creatine

What you need
3–5 grams of creatine monohydrate a day, every day. No need to "load," and timing doesn't matter.
Why it matters
It's the best-studied supplement in all of fitness for holding on to muscle and strength — but only when you're also lifting. Think of it as the sidekick to the strength training up top.
If you skip it
You lose a cheap, safe edge for protecting muscle. (Straight talk: a study specifically in GLP-1 users is still underway, so this is a well-founded bet rather than a proven-in-this-group fact.)

Options to look into

Monohydrate — NSF Certified for Sport $$
Thorne Creatine Plain creatine monohydrate, independently tested for purity. Fancier "forms" cost more and do nothing extra. Heads-up: creatine can nudge a kidney blood test upward without harming the kidney — mention it before bloodwork. Look into this
Monohydrate — budget pick $
Optimum Nutrition Micronized Creatine Same active ingredient for less. Micronized just means it mixes a little easier. Look into this

Omega-3 (fish oil)

What you need
Around 1–3 grams of combined EPA + DHA a day — read the label, since a "1,000 mg fish oil" softgel often has far less of the active part.
Why it matters
Best known for calming inflammation, with some early hints it may help a little with muscle. A reasonable general-health add-on rather than a must-have.
If you skip it
Nothing dramatic — this is an optimizer, not a rescue. Worth it mainly if you don't eat much oily fish.

Our pick

High-EPA/DHA — third-party tested $$$
Nordic Naturals Ultimate Omega A concentrated, well-tested fish oil so you hit the real EPA+DHA target in fewer softgels. Take with food and keep it in the fridge to cut fishy burps. Algae-based versions work for vegans. Look into this

Fiber (psyllium)

What you need
Work toward 25–35 grams of fiber a day, mostly from food. If you top up with a psyllium supplement, start small and always take it with a full glass of water.
Why it matters
These drugs slow your gut down while shrinking how much food (and fiber) you eat — a recipe for constipation. Fiber helps things move and feeds a healthy gut.
If you skip it
Constipation, one of the most common GLP-1 complaints. But add fiber gradually — piling it on a slowed-down stomach too fast just causes bloating and gas.

Our pick

Psyllium — the classic $
Metamucil (sugar-free psyllium) Soluble psyllium fiber. Start with about half a dose and build up over a couple of weeks — and never take it without plenty of water, or it can backfire. Look into this

Handle the side effects

For the rough parts

Most of what helps here you're already doing — protein, fiber, water, magnesium, slower loss. A few extra pointers for the specific complaints people ask about most.

Nausea

What you need
Small, frequent meals; eat slowly and stop at the first sign of full; go easy on fatty, fried, spicy, and very sweet foods. Ginger can take the edge off mild queasiness.
Why it matters
Your stomach empties more slowly on a GLP-1, so big or greasy meals sit heavy and trigger nausea. How you eat is often the difference between tolerating the drug and quitting it.
If you skip it
Nausea is the top reason people stop these drugs — and a lot of it is manageable with a few eating tweaks.

Our pick

Ginger — low-cost, low-risk $
Gin Gins Ginger Chews Ginger has a decent track record for mild nausea and is cheap and harmless to try. It won't override strong drug-driven nausea — tell your prescriber if that's happening. Look into this

Constipation

What you need
The reliable bundle: more fiber (gradually), more water, daily movement, and magnesium citrate if needed.
Why it matters
Slowed digestion plus less food is the classic setup for backed-up plumbing. The fix is rarely one product — it's the combination.
If you skip it
It gets uncomfortable fast, and skimping on water while adding fiber makes it worse. If nothing budges, your clinician can suggest a gentle laxative like PEG.
  • Fiber (psyllium) — build up slowly, always with water.
  • Magnesium citrate in the evening — it draws water into the gut.
  • A daily walk — movement genuinely helps things move.
  • Severe pain or vomiting is different — that's a call-your-doctor situation, not a fiber one.

Hair shedding

What you need
Hit your protein and calorie targets, lose at a steady pace, and fix any real deficiencies (iron, zinc, vitamin D). Then give it time.
Why it matters
The shedding some people notice a few months in is usually "telogen effluvium" — a temporary reaction to rapid weight loss and under-eating, not the drug poisoning your follicles. It almost always grows back once your weight and nutrition steady out.
If you skip it
Crash-dieting and low protein make it worse and drag it out. Eating enough is the real fix.
  • Protein and enough calories first — hair is one of the first things your body cuts when it's underfed.
  • Check iron, zinc, and vitamin D if shedding is heavy — but don't megadose blind.
  • Skip biotin (see below). It only helps a true deficiency, which is rare, and it can throw off important lab tests.
  • Give it 3–6 months after your weight stabilizes; see a dermatologist if it's severe or lasting.

"Ozempic face"

What you need
Lose weight gradually, keep protein and strength training up, protect your skin — and see a dermatologist if restoring volume matters to you.
Why it matters
The drug isn't aging your face — losing fat quickly deflates the fat pads in your cheeks, the same as anywhere else. How fast you lose, your age, and your skin's elasticity decide how noticeable it is.
If you skip it
Nothing you can eat or swallow puts the volume back — that's lost fat, not lost collagen, so collagen powders don't fix it. Slower loss is the one thing you control; for real volume, dermatologists have options (fillers, collagen-stimulating treatments, fat transfer).
  • Lose at a steady pace — the single most controllable factor.
  • Keep protein and strength training up, and stay hydrated.
  • A retinoid and daily sunscreen help skin quality (not volume).
  • For actual volume loss, a board-certified dermatologist is the honest answer — not a supplement.

Save your money

What to skip

The GLP-1 world is crowded with products built to separate you from your money. Here's what the evidence says you can safely pass on.

Biotin for hair

It only helps if you have a true biotin deficiency, which is rare — and high doses can skew important blood tests (including one for heart attacks). Skip it.

Collagen for "Ozempic face"

The facial change is lost fat, not lost collagen, so a collagen powder won't reverse it. It's just an incomplete protein — hitting your overall protein target does more.

Daily electrolyte packets

Genuinely useful during vomiting, diarrhea, or heavy sweating — but you don't need one every day. Plain water and regular meals cover most people. This is mostly marketing.

Digestive enzymes

Heavily promoted for GLP-1 bloating, with little real evidence it helps unless you have a diagnosed enzyme problem. Save your money.

"Natural Ozempic" supplements

No pill, tea, or berry comes close to the medication. Products marketed as a natural version of the drug are selling a story, not a result.

The bottom line

Lift, eat your protein, don't under-eat, and stay hydrated. Then fill the real gaps with a few well-chosen basics.

Do that, and the weight you lose comes off as fat — while your muscle, bones, energy, and hair come through it intact. Everything else on this page is a supporting act.

FAQ

Common questions about the GLP-1 supplement stack

Do I really need supplements on a GLP-1, or is food enough?

Food comes first, always. But when your appetite drops, it gets genuinely hard to hit your protein target and to get enough of a few specific nutrients — vitamin D, B12, sometimes iron — from a much smaller amount of food. That's where a targeted supplement earns its place: to fill a real gap, not to boost results.

What's the single most important thing to get right?

Strength training plus enough protein. Together they're what keeps the weight you lose coming from fat instead of muscle and bone. Every supplement on this page is secondary to those two.

Is there a supplement proven to make GLP-1s work better?

No — and be skeptical of anyone who says otherwise. No vitamin, powder, or pill has been shown in a trial to improve weight loss or results for people on these drugs. The goal of a smart stack is protecting your health and filling nutrient gaps, not enhancing the medication.

Should I get blood work before starting supplements?

It helps, and for iron it's essential — taking iron you don't need can do harm. A baseline check of vitamin D, B12, and iron lets you supplement what you're actually low in instead of guessing. Talk to your prescriber.

Will these supplements interact with my medication?

The items here are generally safe alongside GLP-1s, but your situation is individual — especially if you have kidney disease, take blood thinners, or are on other medications. Share your full supplement list with your prescriber or pharmacist before starting anything new.

Sources

Every claim on this page traces to primary literature or FDA labeling. Browse the full evidence library.

  1. Nutritional Priorities to Support GLP-1 Therapy for Obesity (multi-society advisory) (Mozaffarian et al., 2025)
  2. Office of Dietary Supplements — vitamin & mineral fact sheets (National Institutes of Health)
  3. Vitamin D, Calcium, or Combined Supplementation for the Primary Prevention of Fractures (U.S. Preventive Services Task Force)
  4. GLP-1 medications and muscle loss: what to know about nutrition and supplements (Mayo Clinic)
  5. Biotin supplements may interfere with test to diagnose heart attack (Harvard Health / FDA)
This page is for informational purposes only and isn't medical advice. Talk to a licensed healthcare provider about your situation before starting, stopping, or changing any medication. See our medical disclaimer and editorial policy.

Written by the GLP Index editorial team · Updated July 24, 2026 · How we source

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