Most products on this shelf attach “GLP-1” to a formula that has nothing to do with it. This one is different: muscle and bone loss during rapid weight loss is a documented problem, and protein, HMB, vitamin D and calcium are the reasonable things to point at it.
Product Overview
Youtheory GLP-1 Support Muscle Guard Protein is a powdered shake providing, per two-scoop 47g serving: 20g of grass-fed whey protein, 3g of myHMB®, 50mcg (2,000 IU) of vitamin D, 500mg of calcium and 7.5g of Fibersol® fibre, at 170 calories with 2g of sugar.
It costs $39.99 for a 48oz container, working out at roughly 24 servings, or about $1.67 a serving.
The premise is sound in a way most of this category’s is not. Losing lean mass alongside fat is a real feature of rapid weight loss, and it happens on GLP-1 medications as it does in any large calorie deficit. Rapid weight loss also affects bone. A product combining protein, HMB, vitamin D and calcium is aimed at exactly those things.
The full ingredient list is published: grass-fed pasture-raised whey protein concentrate, sunflower creamer (sunflower oil, corn syrup solids, sodium caseinate, mono- and diglycerides, dipotassium phosphate, tricalcium phosphate, soy lecithin, tocopherols), natural vanilla flavour, rebaudioside A from organic stevia leaf, xanthan gum and salt.
Label, Ingredients, and Amounts
| Active ingredient | Amount per serving |
|---|---|
| Grass-fed whey protein | 20 g |
| myHMB® (beta-hydroxy beta-methylbutyrate) | 3 g — the dose used in HMB research |
| Vitamin D | 50 mcg (2,000 IU), 250% DV |
| Calcium | 500 mg, 38% DV |
| Fibersol® fibre | 7.5 g |
| Manufacturer | Youtheory |
|---|---|
| Serving size | 2 scoops (47 g), mixed with 250 ml of liquid |
| Servings per container | About 24 (48 oz container) |
| Other ingredients | Sunflower creamer (sunflower oil, corn syrup solids, sodium caseinate, mono- and diglycerides, dipotassium phosphate, tricalcium phosphate, soy lecithin, tocopherols), natural vanilla flavour, rebaudioside A, xanthan gum, salt |
| Intended use | Marketed to help prevent muscle breakdown, support bone health and promote regularity for people on GLP-1 medication |
| Directions | Mix 2 scoops with 250 ml of water or the liquid of your choice |
| Warnings | Consult a physician before use if pregnant, nursing, taking medication or with an existing medical condition; not for persons under 18 |
| Allergens | Contains milk (whey and sodium caseinate) and soy lecithin; not dairy-free |
| Pricing | $39.99 for a 48 oz container, roughly $1.67 per serving |
| Subscription options | Not published |
| Refund policy | Not published in detail |
| Shipping | Not published |
How the Manufacturer Says It Works
The claims are “Clinically-studied myHMB® and Vitamin D help prevent muscle breakdown”, “20 grams of high-quality, grass-fed whey protein nourishes your muscles”, “Calcium and vitamin D work together to support your bones” and support for “gut health and regularity”.
Each component maps onto something real. Protein is the primary dietary lever for preserving lean mass in a deficit — and appetite suppression makes hitting protein targets harder, which is precisely the problem. HMB is a metabolite of leucine studied for reducing muscle protein breakdown, with most interest in older adults and during periods of muscle loss.
Vitamin D and calcium address bone, which matters because rapid weight loss is associated with bone density loss. Fibre addresses constipation, one of the most common GLP-1 complaints, made worse when overall food intake drops.
Note what is not claimed. This product does not say it boosts GLP-1, replaces medication or causes weight loss. It is positioned as something you take alongside treatment to protect against a known side effect — an honest and genuinely useful role.
Available Scientific Support
The strongest point is the dose. myHMB at 3 grams is the amount used in HMB research — the literature converges on roughly 3g daily. This is a clinical dose, not a token inclusion, and it is exactly the disclosure Lemme Reset withholds while leaning on the phrase “clinically-studied”.
The same holds across the label. Every active carries a number: 20g protein, 2,000 IU vitamin D, 500mg calcium, 7.5g fibre. A reader can check each against general nutrition guidance, which is the entire point of publishing amounts.
What is missing is citations. The label says “clinically-studied” without naming a single study, and no trial of this finished product is claimed. Third-party testing is mentioned without naming a laboratory or publishing a certificate.
HMB’s own evidence is also worth characterising honestly. It is reasonably well studied for attenuating muscle loss in older adults and in catabolic states, and rather less impressive in healthy trained people. Its use during GLP-1 treatment is a plausible extrapolation from those settings rather than something directly demonstrated — nobody has run the trial of HMB in GLP-1 patients.
Youtheory does publish real warnings: consult a physician if pregnant, nursing, on medication or with a medical condition, and not for under-18s. That is more than most of this shelf offers.
Limitations of the Evidence
20g of protein is a serving, not a strategy. Protein requirements rise during weight loss, and one shake will not meet them. Treated as a top-up alongside food it is sensible; treated as the answer to muscle preservation it is not.
Resistance training is the missing ingredient, and no supplement substitutes for it. Protein and HMB support muscle retention; loading the muscle is what actually signals the body to keep it. A product aimed at this problem could say so more prominently.
The creamer is a compromise. Corn syrup solids and sodium caseinate in a product marketed for health-conscious use are worth noticing, and the caseinate means this is firmly a dairy product. Anyone avoiding dairy or soy should look elsewhere.
Fibre needs care. 7.5g per serving is useful, but increasing fibre quickly — particularly while eating less and drinking less, both common on GLP-1s — can worsen bloating and constipation rather than relieve it. Add fluid and build up gradually.
At $1.67 a serving, it also costs more than buying whey protein, HMB, vitamin D and fibre separately — the premium is for convenience and formulation, which is a fair trade only if you would not otherwise assemble them.
Pros and Cons
Pros
- Targets muscle and bone loss, which is a genuine and documented GLP-1 concern
- myHMB at 3g — the dose used in the research, not a token amount
- Every active ingredient carries a published number
- Full ingredient list published, including the creamer components
- Real warnings published, including pregnancy, medication and an age limit
- Vitamin D and calcium address bone loss, which most competitors ignore entirely
- 7.5g fibre addresses constipation, a common complaint on these medications
- Makes no claim to boost GLP-1, replace medication or cause weight loss
Cons
- "Clinically-studied" with no study cited anywhere
- HMB use during GLP-1 treatment is an extrapolation — no trial in this population
- 20g protein is one serving’s contribution, not a daily target
- Contains milk and soy; the creamer includes corn syrup solids and sodium caseinate
- Third-party testing mentioned without naming a lab or publishing a certificate
- Does not emphasise resistance training, which does most of the work here
- About $1.67 a serving, more than assembling the components separately
Who It May Be Best For
One of the more sensible purchases on this shelf if you are taking a GLP-1, struggling to eat enough protein because your appetite has fallen, and want the convenience of one product covering protein, HMB, bone nutrients and fibre.
Particularly worth considering if you are older. Age-related muscle loss and GLP-1-associated lean mass loss compound, and HMB’s evidence is strongest in exactly that group.
Pair it with resistance training. That is not a caveat so much as the main recommendation — the supplement supports what training signals, and without the training it is doing much less.
Who Should Avoid It
Avoid if you are dairy-free or avoid soy. Whey concentrate and sodium caseinate are both milk proteins, and the creamer contains soy lecithin.
Check with your clinician if you have kidney disease before adding a protein supplement, and speak to your prescriber before adding fibre if you have significant gastrointestinal symptoms on your medication.
Do not treat it as protection that lets you skip the basics. Adequate total protein across the day and resistance training are what preserve muscle; this is a contribution to the first and no substitute for the second.
Alternatives
Plain whey protein plus a separate 3g HMB supplement covers the same ground more cheaply if you do not mind assembling it. Supergut GLP-1 Daily Support covers the fibre side alone. Our best GLP-1 supplements page ranks the category, and GLP-1 nausea and GI side effects covers the digestive issues this product’s fibre is aimed at.
Frequently Asked Questions
Do you actually lose muscle on a GLP-1?
Yes. When you lose weight rapidly, a meaningful proportion of what comes off is lean mass rather than fat, and that happens on GLP-1 medications as it does with any large calorie deficit. It matters because muscle supports metabolic rate, strength and function, and because it is harder to rebuild than to lose. This is one of the few genuine problems a GLP-1 supplement can address.
Is 3g of myHMB a real dose?
Yes. HMB research consistently uses about 3 grams a day, so this product delivers the studied amount rather than a token quantity. That is the single most important thing to check on any supplement label, and it passes.
Is 20g of protein enough?
It is a reasonable single serving, not a daily total. Protein needs rise during weight loss, and 20g is a contribution rather than a solution — most people on a GLP-1 will need considerably more across the day, from food as well as any shake.
Does the fibre help?
Probably, for a specific reason. Constipation is a common complaint on GLP-1 medications, partly because food intake falls, and 7.5g of Fibersol per serving is a meaningful contribution toward a daily fibre target. Increase fibre gradually and with fluid to avoid making things worse.
Is it dairy-free?
No. The base is grass-fed whey protein concentrate, and the sunflower creamer also contains sodium caseinate, another milk protein. It is not suitable if you avoid dairy, and the creamer also contains corn syrup solids and soy lecithin.
Supplement Disclaimer & Review Date
These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Dietary supplements are not FDA-approved medications, are not reviewed by the FDA for safety or effectiveness before they go on sale, and are not a substitute for prescription treatment.
Nothing on this page is medical advice, and nothing here should be read as a promise of weight loss or of any particular result. Supplements can interact with prescription medications and are not appropriate for everyone. Talk to a doctor or pharmacist who knows your medical history before starting any supplement — particularly if you are pregnant or breastfeeding, take prescription medication, manage a chronic condition, or are already taking a GLP-1 medication.
Details about Youtheory GLP-1 Support Muscle Guard Protein come from the manufacturer's own published materials as of the date below. Ingredients, amounts, pricing, and policies change frequently — check the current label and product page before purchasing.
Last reviewed: September 6, 2026
Check the Current Label
Ingredients, amounts, pricing, and policies change. Verify against the current product page before buying.