As Seen on TikTokKorean Café InspiredClinically Backed PeptidesZero Fishy AftertasteHalal & Kosher CertifiedThird-Party Tested11 Café FlavorsChef-Crafted+138% Skin HydrationHalf the Dalton SizeTastes Like Dessert As Seen on TikTokKorean Café InspiredClinically Backed PeptidesZero Fishy AftertasteHalal & Kosher CertifiedThird-Party Tested11 Café FlavorsChef-Crafted+138% Skin HydrationHalf the Dalton SizeTastes Like Dessert
Crushed Tonic Banana Milk collagen pouch beside a glass of banana milk
LIVE Korean Beauty · In a Cup

Tastes like dessert.
Works like skincare.

Shop All Products →
★★★★★ 4.9 · 2,400+ reviews · 100,000+ in the Crush Club.
Skin Hydration
+128%
vs. baseline · clinical · daily use
Clinical8 weeks
★★★★★4.9 · 2,500+
"I'm on my 5th batch. I blend it into my smoothies every morning."
JJulia Fox · verified
⭐ Best Seller 🥛 Bovine 🐟 Marine 🌱 Vegetarian

★★★★★4.9 · 12 reviews · 1 in 2 reorder

25% off first month, then 15% off · Free shipping · Skip, swap, or pause anytime

✓
+153% skin elasticity in 8 weeks (clinical)
✓
+128% hydration · skin that holds water better
✓
4,000 Dalton peptides · half the size of Vital Proteins
Free shipping $60+
30-day guarantee
Sustainably sourced
Lab certified
5g
clinically effective dose
per stick
Glow From Within
5g Hydrolyzed Marine Collagen per Serving Low Molecular Weight for Better Absorption Pure Collagen with 0 Fillers 19 Amino Acids Delicious, Creamy & Low Sugar
Clinically Proven Non-GMO Fully Traceable Halal & Kosher 3rd-Party Tested Zero Metals
Marine vs. Bovine?+
Marine (from fish) is our premium, beauty-forward option. Bovine contains both Type I and Type III. Both are certified Halal & Kosher.
Why This Collagen Actually Works+
Our collagen is hydrolyzed to 4,000–5,000 Daltons — half the size of Vital Proteins, small enough to be absorbed directly through the gut lining.
Clean Ingredients+
Halal and Kosher certified. Zero artificial coloring. Zero artificial flavoring. Lab-tested for heavy metals, dissolvability, and absorption. Sustainably sourced and engineered for maximum bioavailability. Certificate of Analysis available for every batch. See full ingredient list →
Full Amino Acid Profile+
Hydroxyproline (structural stability), Methionine (antioxidant protection), Arginine (collagen synthesis), Lysine (cross-linking strength), Histidine (barrier repair), plus Proline, Leucine & Glycine — the backbone trio that forms ~57% of collagen by weight.
30 drinks in

Hydrate from Within

5g a day. 30 days. Most customers notice these four shifts before the month is over— and the people around them notice first.

Skin
The "did you change something?" effect. Plumper, more even, less of that drained 8am look. Works from the dermis up, where your $90 serum can't.
+28% hydration · 30 days
Hydration
Not the kind your moisturizer fakes. The kind that shows up under your eyes in the morning — when your skin used to look thirsty and now it doesn't.
Visible from week 4
Hair
Less breakage in your brush, more shine at the ends, the kind of fullness no dry shampoo can fake. Your keratin protein chain, finally getting fed.
Visible from weeks 6–10
Nails
The kind that grow past the nail bed without splitting. Less peeling, less weird ridges. The kind you stop hiding under gel manicures.
Stronger growth cycle
The Glow
The lit-from-within thing your favorite It-girl never explains. Not a highlighter, not a filter — actual dermal-level support, every morning, in a cup.
The whole reason
Wellness
Gut-supportive, low-sugar, no fillers, no junk. The rare habit that earns its place in your morning — and the rarer one that stays there past February.
Halal · Kosher · GMP

Thirty days from now, you'll see it too.

One stick a day is the whole routine. Start with a box and let your skin, hair and nails do the talking.

Shop the collagenTake the quiz

Free shipping over $75 · Cancel anytime

The Flavor Promise

"The only collagen I've been able to finish... I'm actually hooked.

I've never been so excited about something that's good for me."

THE NUMBERS BEHIND THE SCIENCE

Clinically Proven.

Most collagen brands rely on oversized servings. We rely on smaller peptides. Smaller peptides are more easily absorbed, with research showing benefits from as little as 2.5g.* Still, every serving delivers a full 5g— about 2× the clinically studied amount— with no fillers, no fluff, and no oversized scoops.

✓
Halal & Kosher collagen
✓
No dyes, junk or fillers
✓
Nostalgic flavors with 0 to 3g sugar per drink
✓
Small molecular size
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+128%
Skin hydration · 8 weeks
+153%
Skin elasticity · 8 weeks
2x
More bioavailable
−9.73%
Wrinkle depth reduction

*Based on clinical studies of hydrolyzed collagen peptides

Before & after

The same skin.
30 days apart.

97%
Skin vitality & texture
87%
Skin hydration & radiance
100%
Skin firmness & less wrinkles

*Consumer Perception Study, 100 people, ages 18–31

DAY 30
DAY 1
‹›
← Drag →
Conditions Supported

Skin concerns
we address

Clinically formulated collagen targets visible skin conditions from the inside out.

Acne & RosaceaDark CirclesEczemaFine LinesSkin HydrationSkin FirmnessHyperpigmentationDullnessPore Size
in just 30 days

Five studies. 376
women. One conclusion.

Skin elasticity meters, wrinkle-depth imaging, dermal hydration probes. The boring science, done right.

Study 1 12 weeks · n=64

Method: Skin elasticity measured by cutometer — quantifying the time and quality of skin's ability to return to its original state after stretching.

At week 12, regular intake led to:
  • +18%Increase in skin firmness
  • −27.2%Decrease in wrinkle depth
  • +22.8%Increase in skin hydration
Double-blind, placebo-controlled · J. Med. Food
Study 2 12 weeks · n=72

Method: Wrinkle shadows measured via high-resolution facial imaging. Light reflection across the skin surface tracked weekly to assess texture and depth.

At week 12, regular intake led to:
  • −9.73%Average reduction in wrinkle shadow length
  • Visibly smoother skin texture
  • More even light reflection — firmer surface, reduced wrinkle depth
Skin Pharmacology & Physiology · Peer-reviewed
Study 3 12 weeks · n=95

Method: Perioral and Crow's feet wrinkles studied on 95 healthy women aged 55–60. Skin complexion, elasticity, and wrinkle severity scored weekly.

At week 12, regular intake led to:
  • Improved skin elasticity
  • Reduced facial wrinkle appearance
  • Improved skin complexion homogeneity and radiance
  • Decrease in mean score of facial wrinkles
Nutrients Journal · Randomized controlled trial
Study 4 8 weeks · n=60

Method: Skin deformation under controlled mechanical stress measured alongside the time required for the skin to return to its original shape.

At week 8, regular intake led to:
  • +28%Increase in skin hydration
  • −14%Decrease in fine line visibility
  • Improved skin radiance and tone evenness
Marine Drugs · Double-blind, placebo-controlled
Study 5 16 weeks · n=85

Method: Hair tensile strength and growth rate measured monthly using digital trichoscopy. Nail growth and brittleness scored independently.

At week 16, regular intake led to:
  • +12%Increase in hair strand strength
  • −42%Reduction in nail brittleness
  • Faster nail growth across all participants
Journal of Cosmetic Dermatology · Peer-reviewed
← Swipe through the studies →
FAQ

Why is Crushed Tonic not like the rest?

Most people hate collagen, and never try it again. If you're one of them, give us one final chance before you knock on collagen forever.

01 It must be effective

Small enough
to actually absorb.

Above 5,000 Daltons, the molecules are too large to cross the gut lining. Peptide size decides whether the collagen reaches your skin at all.

✗
Most collagen~10,000 Daltons. Too big to absorb. Most of it never reaches the dermis.
✓
Crushed Tonic4,000 Daltons. Half the size of average collagen brand. Actually crosses the gut lining intact.
02 It must be premium

Clean source.
Clean process.

Cheap collagen carries the supply chain with it— heavy metals from polluted oceans, hormones from feedlot cattle, fillers and gums to mask cheap inputs.

✗
Most collagenUntraceable source. Fillers, gums, anti-caking agents. Rarely 3rd-party tested.
✓
Crushed TonicTraceable to the exact fish. 3rd-party tested. Halal & Kosher. Zero fillers.
03 It must taste good

Icky? You'll
stop drinking it.

Collagen only works if you drink it daily— and you only drink it daily if you actually want to.

✗
Most collagenFishy aftertaste. Chalky texture. Fake tasting flavors.
✓
Crushed Tonic11 Korean café flavors. 0 to 3g sugar. 1 in 2 customers repurchase — highest in the category.
→Swipe to see all three
pre-order today

Collagen Jelly

Delicious, snackable, gummy jelly.

  • Hydrolyzed marine peptides, fully dissolving
  • 3rd-party tested for 0 metals, toxins & fillers
  • Clinically proven +28% skin hydration in 30 days
2 minutes · 4 questions

Korean Beauty,
in a cup. three.

Flavor quiz: how you take your morning, what your wind-down looks like, what you crave most. We'll match you to the three flavors most likely to become your forever cups.

Flavors Quiz →
Find Your Fav
On 14 million screens

The morning ritual,
in 14 million takes.

What started in one kitchen now happens in 100,000.

#collagencup#kbeautyritual#7amritual#bananamilkcollagen
@sallyk.glow 3.2M
"day 47 of the banana milk and I refuse to go back"
@itsjess.daily ▶ 1.8M
"the strawberry milk pour is my whole personality now"
@mira.matcha ▶ 4.1M
"30-day glow check. i wasn't expecting it to actually work."
@thecollagencup ▶ 2.6M
"hojicha at sunset. unserious. effective."
Start Your Tub #1 →
Sally Olivia Kim
Sally Olivia Kim
Founder, Crushed Tonic
▶ Watch Sally on QVC
The story

Founded by a
published author.

Sally Olivia Kim had a kitchen accident in her twenties. A burn bad enough to change her relationship with her skin forever. Her dermatologists told her to drink collagen daily— so she tried every brand on the market, and every single one tasted like fish, chalk, or punishment.

So she flew to Korea. Seven years with Korean labs, flavor scientists, and board-certified dermatologists to build a collagen that didn't taste like medicine. The Korean café drinks she grew up on — banana milk, strawberry milk, matcha — became the inspiration for every flavor.

She wrote a book about everything she learned. The Collagen Glow, published by W. W. Norton, is in bookstores now. And the cup she built for herself? 100,000 women now drink it in their kitchens before anyone else is awake.

7
Years in Korean labs
100k+
In the Crush Club
W.W. Norton
Published author
The Collagen Glow
Published by W. W. Norton

Everything Sally learned,
in one book.

Seven years of research with Korean labs and dermatologists, distilled into a practical guide to ingestible collagen — what works, what doesn't, and how to build a ritual you'll actually keep.

The Science, Simplified
Dalton sizes, bioavailability, and why most collagen fails — explained without the jargon.
30 Korean Café Recipes
The banana milk, the matcha foam, the strawberry latte — all the drinks that started it all.
Dermatologist-Backed
Reviewed by board-certified dermatologists, with clinical references throughout.
Get the Book → Read an Excerpt
Questions

Everything you might ask.

How quickly will I see results?+
Most customers notice improved hydration within 2–4 weeks, with visible changes to fine lines and elasticity by week 8. Hair and nail benefits typically appear around weeks 6–10. Consistency is key — one drink daily.
Does it really taste good?+
Yes — that's the whole point. Each flavor is built around a nostalgic Korean café drink, with zero fishy aftertaste and 0 to 3g of sugar. 1 in 2 customers repurchase, the highest rate in the category.
How do I use it?+
Mix one tablespoon into 2 tablespoons of water until dissolved, then add a cup of your favorite milk over ice. Or blend directly into smoothies, coffee, or matcha. It dissolves clean with no grit.
Marine or bovine — which should I choose?+
Marine is our premium, beauty-forward option (mostly Type I collagen, ~4,000 Daltons). Bovine is broader-spectrum (Type I & III) for skin, hair, nails, and joints. Both are Halal and Kosher certified.
Is it third-party tested?+
Every batch is third-party tested for heavy metals, purity, dissolvability, and absorption. A Certificate of Analysis is available for each batch, and our collagen is traceable down to the exact fish.
How does the subscription work?+
Subscribe and save 25% on your first month, then 15% off ongoing. Shipping is free, and you can skip, swap flavors, or pause anytime from your account. No commitment.
What's your guarantee?+
We offer a 30-day money-back guarantee. If you don't love your first bag, reach out and we'll make it right — no questions asked.
Is it safe during pregnancy?+
Our collagen is clean and free of fillers, but as with any supplement, we recommend consulting your doctor before use if you are pregnant or nursing.