1 in 8 American adults have taken a GLP-1.*KeptStrong was built for them.
You’re losing the weight.Make sure it’s the right weight.
On a GLP-1, about 1 in 4 pounds you lose isn’t fat — it’s muscle.* That’s the strength, the shape and the metabolism you’re working to keep. KeptStrong is the protein-first line built to help you hold onto it.
Losing weight fast means losing more than fat.
When the pounds come off quickly, your body sheds muscle along with the fat, and smaller meals leave you short on the nutrients that keep you going. In a study of 461,382 adults on GLP-1s, more than 1 in 5 developed a nutritional deficiency within a year.* And smaller meals make protein — what your body needs to hold muscle — the hardest target of all.
See the research behind each formula →
The scale is only part of the story.
Millions of women and men on a GLP-1 are thrilled with the results. They’re also quietly dealing with changes nobody warned them about. We built KeptStrong to help you keep the parts of yourself that matter. Every formula is clean, and every claim comes with a source you can check.
Our story
One for each part of the journey.
Rebuild
100% whey isolate — 22g protein, 120 calories — to hold the lean muscle smaller meals put at risk.
Rebuild
100% whey isolate — 22g protein, 120 calories — in smooth vanilla.
Preserve
Creatine + electrolytes to keep the muscle you’ve earned.
Restore
Daily support for a gut in transition.
Renew
Collagen for the skin and hair fast loss can leave behind.
Revive
The B12, iron and B-vitamins your energy runs on when you’re eating less, in one daily dose.
Defend
Colostrum to back the immune system a changing body leans on.
Rest
Magnesium glycinate for restful sleep, without melatonin.
Flow
Organic beetroot for healthy circulation, energy and heart health.
Water Bottle
Stay filled, stay strong — the 32 oz insulated Kept Strong bottle.
One system, for every part of the journey.
From protein to sleep to circulation, KeptStrong is built for the people a GLP-1 changes the most — and every formula comes with a source you can check.
Five changes. Five answers.
Pick a formula to see exactly what it delivers, and why each choice is in there.
The protein you can’t eat, in a glass.
22g of 100% whey protein isolate per serving — a full muscle-building dose in just 120 calories, for the days a real meal feels impossible.
About 1 in 4 pounds lost on a GLP-1 is muscle, not fat.* Protein paired with resistance training is the most-studied lever for holding onto it.
100% whey isolate delivers all nine essential amino acids — including the leucine that signals your body to build and keep muscle.
Isolate is filtered to the purest form of whey — minimal lactose — with apple pectin for digestive support when your gut is adjusting.*
Two bites and you’re full? A fast, low-volume shake gets your protein in when chicken sounds impossible.
The muscle you earned, kept.
5,000mg creatine monohydrate per scoop — the most-studied form in sports nutrition, and the daily dose used in the research on lean mass in older adults.
When you're losing weight fast, up to 25–39% of it can come from lean mass — creatine paired with resistance training is studied for supporting the muscle you're working to keep.
In research on adults over 50, creatine combined with resistance training was associated with greater gains in lean mass than training alone.
Added electrolytes — 1,000mg sodium, 200mg potassium, 60mg magnesium — help you stay hydrated as your intake drops.
One 10g scoop of lemon-flavored powder a day, with no loading phase to fuss over.
Skin, hair and nails, looked after.
Grass-fed hydrolyzed collagen peptides, Types I & III — a half scoop (10g) daily sits right in the 2.5-10g range used across the published skin and joint research.
Hydrolyzed collagen peptides are the form studied in research on skin elasticity and hydration, so eating less doesn't have to show on your face.
Types I & III are the collagen types most abundant in skin, hair and nails, delivering the glycine and proline these tissues are built from.
Collagen peptides have been researched for supporting joint comfort in active adults.
Unflavored and quick-dissolving, it stirs into your morning coffee without changing the taste.
Comfortable digestion, energy replaced.
Two capsules a day cover both halves of eating less: a digestive-comfort blend, plus the bioactive B12, iron and daily nutrients meals fall short on when your portions shrink.
Bioactive B12, iron and B-vitamins replenish the nutrients that fuel normal energy metabolism, the ones that run short when you are eating less.
Ginger, peppermint and bromelain help promote a comfortable digestive experience and ease occasional discomfort.
LactoSpore probiotic with magnesium supports healthy digestive function and a balanced gut environment.
Formulated for adults managing changes in appetite and routine, so smaller meals still deliver comfort and daily nutrients.
Your gut lining, fueled.
3,150mg L-glutamine per scoop — the amino acid that research identifies as the primary fuel source for the cells lining your gut.
L-glutamine is the main fuel for gut-lining cells, the focus of research on maintaining a healthy intestinal barrier.
Glutamine's role in gut-lining cell health has been examined across decades of published research.
A single unflavored amino acid with nothing extra, so it fits easily alongside the rest of your routine.
One unflavored scoop a day dissolves into water, coffee or a smoothie without a trace.
Don’t take our word for it. Take the research’s.
Every KeptStrong formula is built on published, peer-reviewed findings. Here is what the literature actually says.
“Creatine supplementation can significantly improve muscle strength and physical function in postmenopausal women.”
About 1 in 4 pounds lost on GLP-1 medications comes from lean mass, not fat. Some studies found 25–39%.
At the 3–5g daily dose, creatine monohydrate is one of the most-studied supplements there is, documented safe in healthy adults across years of continuous use.
Clean formulas, honest claims.
Research-backed
Every claim traces to published research. No hype, just sources you can check.
Made for real change
Formulated for a body going through a major change, not for a 22-year-old at the gym.
Kept in writing
60-day money-back guarantee. Subscribe & save, cancel or skip anytime.
Why KeptStrong, not another supplement.
- Built specifically for bodies losing weight fast
- A published source behind every claim
- One clear formula for each change: muscle, skin, digestion, gut
- 60-day money-back guarantee, kept in writing
- No caffeine or stimulants
- Generic formulas made for everyone and no one
- Claims without sources
- Kitchen-sink blends that cover nothing well
- Guarantees buried in fine print
- Hidden stimulants for a fake ‘boost’
Arrive at your goal strong.
The GLP-1 strength companyFor everyone on a GLP-1.
Whether you’re three weeks in or a year down the road, keep the strength, skin and gut you’ll want on the other side. Every order is backed by our 60-day money-back guarantee, kept in writing.