The GLP-1 strength company · 60-day money-back guarantee · Manufactured in the USA
KeptStrong · Whey Isolate + Concentrate Blend

Rebuild

When you’re eating far less, protein is the first thing to fall short — and your body needs it to hold onto muscle as the weight comes off. Rebuild is a vanilla whey protein blend, 22 grams in one easy glass, with Solnul® prebiotic fiber. Paired with resistance training and adequate protein, it helps you keep the lean muscle that keeps you strong.* Two scoops, stirred into water or milk.

Built on published protein & muscle research
22g protein
Whey isolate + concentrate blendA complete protein with all nine essential amino acids, per two-scoop serving — the building blocks for lean muscle*
2sources
Fast + sustained wheyIsolate for a lean, fast-digesting base and concentrate for a fuller amino profile
+fiber
Solnul® prebiotic fiberResistant potato starch that feeds a healthy gut — protein and fiber in one vanilla glass*
15servings
Real vanilla, no junkNaturally sweetened, no artificial sweeteners. Two scoops in cold water or your beverage of choice. Made in the USA
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*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. Rebuild is a dietary supplement, not a treatment for any medication or condition.

The part nobody warns you about

When the meals get smaller, protein is the first thing to come up short.

Lose weight fast without enough protein and too much of what you lose can be muscle, not just fat.

On a GLP-1, appetite drops and portions shrink. That’s the plan — but protein is usually the hardest target to hit when food just isn’t appealing, and your body needs it to hold onto lean muscle as the weight comes off. Rebuild gives you 22 grams of whey in one easy vanilla glass, plus Solnul® prebiotic fiber, so you can keep hitting your protein goal even on the days you can barely finish a meal. Paired with resistance training and adequate protein, it helps you keep the strength you’re working so hard to protect.*

An active person after a workout with a vanilla shake
The science, simply

How Rebuild helps you hold onto lean muscle.

01 · Protein target

Enough protein, every day

Holding onto muscle during weight loss comes down to two things: enough protein and resistance training. Rebuild makes the protein part easy with 22 g in a single serving.*

02 · Complete whey

All nine essential aminos

Whey is a complete protein rich in leucine, the amino acid that signals your body to build and maintain muscle. Isolate plus concentrate gives you a fast, full amino profile.*

03 · Plus fiber

Solnul® prebiotic fiber

A smaller diet is often short on fiber too. Rebuild folds in Solnul® resistant starch to help feed a healthy gut, so one glass covers protein and fiber at once.*

What the research shows

The proof, with sources.

1.2kg

In a randomized trial, higher protein paired with intense resistance training during a calorie deficit supported greater lean-mass gain (+1.2 kg) than lower protein — while still losing fat.*

RCT, lean mass in a deficitLongland et al., Am. J. Clin. Nutr., 2016 · PMID 26817506
22trials

A meta-analysis of 22 randomized trials (680 people) found protein supplementation with resistance training augmented gains in muscle mass and strength, in younger and older adults alike.*

Meta-analysis, protein + trainingCermak et al., Am. J. Clin. Nutr., 2012 · PMID 23134885
0.4kg spared

Across weight-loss trials, a higher-protein calorie-reduced diet helped preserve lean tissue — about 0.4 kg less fat-free mass lost than on standard protein.*

Meta-analysis, protein in weight lossWycherley et al., Am. J. Clin. Nutr., 2012 · PMID 23097268
One vanilla glass a day

The daily habit.

DAY 1

An easy win

Two scoops in cold water or milk. A vanilla shake that takes thirty seconds and hits your protein goal.

EVERY DAY

Protein, handled

Even on days food isn’t appealing, one glass keeps your protein target met so your body has what it needs.*

WITH TRAINING

Keep your strength

Paired with resistance training, adequate protein helps you hold onto the lean muscle that keeps you strong.*

60-day money-back guarantee

Days to feel the difference, or your money back.

Drink Rebuild every day for two full months. If it isn’t earning its place in your routine, write to us for a full refund. No forms, no interrogation. Our word, kept in writing.

Questions people ask us

Before you start

What does it taste like?

Rich vanilla, naturally sweetened — no artificial sweeteners. It mixes smooth into cold water, and even better into milk or a milk alternative.

Why protein on a GLP-1?

When you eat much less, protein is the hardest nutrient to hit, and your body needs it to hold onto lean muscle as you lose weight. Rebuild makes it easy to reach your protein target in one glass. Paired with resistance training, it helps you keep your strength.*

How much protein, and how many servings?

22 grams of whey protein per two-scoop serving, about 15 servings per tub. Most people have one serving a day; you can have more to reach your personal protein goal.

Is it dairy?

Yes — whey is a milk protein, so Rebuild isn’t suitable if you have a milk allergy. It’s a whey isolate-and-concentrate blend with Solnul® fiber, natural flavors, pink Himalayan salt and stevia.

Is it safe with my medication?

Rebuild is a protein supplement, not a drug, and makes no claim to treat or interact with any medication. As with anything new alongside a GLP-1, run it by your doctor, then enjoy it with confidence.

What if it’s not for me?

Drink it daily for 60 days. If you don’t feel it’s earning its place, write us for a full refund.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This product is a dietary supplement and is not a treatment for any medication or condition. Always consult your physician before starting any new supplement. © 2026 KeptStrong.