The GLP-1 supplement protocol: what to take and how much

If you are on a GLP-1 medication like Ozempic, Wegovy or Mounjaro and you have searched for what supplements to take, you have probably found opinions, not numbers. A 2025 review in the journal Obesity Pillars changed that. It is the first published attempt to put actual doses on the supplements that matter for GLP-1 users, from protein to creatine, and it is worth reading closely before you spend money on a cabinet full of pills.

TL;DR

A 2025 narrative review laid out the first supplement protocol built specifically for people using GLP-1 medications: 1.2 to 2.0 g/kg of protein a day, plus vitamin D, omega-3, creatine and HMB to protect muscle, and fiber and probiotics for the gut. The honest catch is that no trial has yet tested these supplements alongside a GLP-1 drug, so every dose is borrowed from wider weight-loss research. Treat it as the best-informed starting point available, not a proven prescription, and check the doses with your doctor.

Why GLP-1 users need a supplement plan at all

These drugs work by cutting how much you eat, in some cases by up to 40%. That is the whole point, and it is why they work so well. But eat far less food and you take in far fewer of the vitamins, minerals and protein your body still needs every day. The weight comes off. So, quietly, can the nutritional foundation underneath it.

The bigger concern is muscle. When you lose weight on a GLP-1 medication, a large share of what you lose is lean tissue, not just fat. The review cites estimates that 20 to 50% of the weight lost can be lean body mass, and quotes a striking comparison from the field: losing 10% of your muscle over 68 weeks on one of these drugs is roughly what two decades of normal aging would do to you. Muscle loss on Ozempic and similar drugs is not a fringe worry. It is the default unless you act against it.

This is the gap the supplement protocol is built to fill. It is worth understanding why the gap exists in the first place, which we covered in our piece on why GLP-1 trials rarely measured what you eat. Almost nobody studied the nutrition side while these drugs were being approved, so the guidance is only now catching up.

The protocol, dose by dose

Here is what the review recommends, with the doses it specifies. Think of the first group as the muscle-protection core and the second as gut and general support.

• Protein: 1.2 to 2.0 g per kg of adjusted body weight per day. This is the single most important item on the list and the foundation for keeping muscle. For many people it means roughly doubling their usual intake at a time when appetite has dropped, which is exactly why it is hard.
• Whey protein: 20 to 40 g per day. A practical way to hit the protein target on days when solid food feels like too much. It is a tool for the protein goal above, not a separate requirement.
• Creatine monohydrate: 5 g per day. Supports strength and lean mass, but only when paired with resistance training about three times a week. Creatine on GLP-1 is now standard in several competitor ranges, and it is one of the cheapest, best-studied supplements available.
• HMB (beta-hydroxy beta-methylbutyrate): 3 g per day. A compound your body makes from the amino acid leucine, studied for slowing muscle breakdown during weight loss and periods of low food intake.
• Vitamin D3: around 7,100 IU per day, or 50,000 IU per week. Note this is a deficiency-correction figure, not a casual maintenance dose, and it sits above the usual upper limit. More on that below, because this is the number to be most careful with.
• Omega-3 fatty acids: at least 1 g per day. Included for their anti-inflammatory role and possible support of muscle protein balance during rapid weight loss.
• Fiber: more than 10 g per day, for at least four weeks. Helps with the constipation many GLP-1 users get from slowed digestion, and feeds a healthier gut.
• Probiotics: 1 to 30 billion CFU per day. Aimed at supporting the gut microbiome and easing the digestive side effects that come with delayed stomach emptying.
• Curcumin: 500 to 1,500 mg per day. Included as an anti-inflammatory option, though the evidence here is the softest of the group.

The review also flags a longer list of micronutrients that commonly run low on GLP-1 medications and may need covering through diet or a supplement: calcium, iron, magnesium, potassium, vitamin B12, vitamins A, C and E, and choline. These map closely to the deficiency patterns already documented in GLP-1 users, which we broke down in what vitamins you are deficient in on GLP-1 medications.

The caveat that matters most

Before you build a stack around these numbers, read the authors' own warning, because it is the honest core of the whole review. In their words, no clinical trial has yet directly evaluated dietary supplementation alongside GLP-1 treatment. Every dose above is extrapolated from research in general obesity and weight-loss populations, then applied to GLP-1 users by informed judgement.

That is not a reason to ignore the protocol. It is the reason to read it correctly. This is the best-reasoned starting point that currently exists, assembled by people who study sports nutrition and metabolism, but it is a set of educated recommendations, not proven fact. The direct trials, testing whether taking creatine or HMB or a specific protein target while on semaglutide or tirzepatide actually changes outcomes, still have not been run. Initial results from the wider literature are encouraging. They are not the same as a GLP-1-specific answer.

The vitamin D figure is where this caution bites hardest. Around 7,100 IU a day is well above the 4,000 IU daily upper limit set for the general adult population. That number reflects correcting a real, measured deficiency, not a dose everyone should swallow by default. Take that much without knowing your blood level and you risk pushing vitamin D too high, which carries its own problems. Get a 25-hydroxy vitamin D test first and let a clinician set your dose.

How to use this without overdoing it

A protocol is only useful if it fits real life. Here is how to apply it sensibly rather than turning your kitchen into a pharmacy.

• Food first, supplements to fill the gap. Protein, fiber and most micronutrients are better taken as food. Supplements exist to cover what your shrunken appetite cannot reach, not to replace meals.
• Get a baseline blood panel. Testing before you start tells you which gaps are real for you. Our GLP-1 monitoring guide walks through which labs to run and when to repeat them.
• Make protein the non-negotiable. If you do only one thing from this list, hit the protein target and add resistance training. That combination does more to protect muscle than any pill. Our guide to muscle loss and protein intake goes deeper on the how.
• Pair creatine with training, or skip it. Five grams a day does little for someone who is not loading their muscles. If you are not doing resistance work yet, that is the higher priority.
• Introduce fiber slowly. Ramping fiber too fast on top of delayed digestion can worsen bloating. Build up over a couple of weeks and drink more water.

None of this replaces the conversation with your prescriber, especially if you take other medications or have kidney concerns, which change what is safe for protein and several minerals. But it gives you a concrete framework instead of guesswork. GLP-1 Shield is formulated around exactly these deficiency patterns, so the nutrients your body draws on for muscle, energy and recovery are covered while your food intake is down.

Frequently asked questions

How much protein should I eat on a GLP-1 medication?

The 2025 protocol suggests 1.2 to 2.0 g of protein per kg of adjusted body weight per day, which is higher than the standard adult recommendation. The goal is to protect muscle while you lose weight fast. A whey protein shake of 20 to 40 g can help close the gap on days when appetite is low, but food sources should come first.

Should I take creatine on Ozempic or Wegovy?

The protocol includes 5 g of creatine monohydrate a day, but only paired with resistance training about three times a week. Creatine supports strength and muscle when you actually load the muscle, so it does little on its own. It is one of the supplements competitors now build into GLP-1 ranges, and it is cheap and well studied.

Is 7,100 IU of vitamin D a day safe?

That figure is above the 4,000 IU daily upper limit set for the general adult population, so it is not a dose to self-prescribe. It reflects correcting a documented deficiency, not a maintenance dose for everyone. Get your blood level of 25-hydroxy vitamin D checked and let your doctor set the dose from there.

Do these supplement doses come from GLP-1 studies?

No, and the authors are clear about it. No clinical trial has yet tested these supplements alongside a GLP-1 medication. Every dose is borrowed from wider obesity and weight-loss research and applied to GLP-1 users by informed extrapolation, so treat the protocol as a well-reasoned starting point rather than proven fact.