Daily hand care for climbers who crimp hard. Clinically studied ingredients that support the finger tendons, pulleys, and joints under every session, so you never have to take weeks off the wall.
The World's #1 Collagen for Climbers' Hands (Supports Finger Tendons & Joints in 30 Days)
- Rebuilds the tendons crimping tears
- Kills finger inflammation
- Guards your joints against future arthritis
- Repairs as you damage, every single day
Watch Out For Cheap "Climber Collagen" Copies
Kiyss is sold only here; beauty-collagen relabels won't dose the tendon.
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What Makes Kiyss Different?
Collagen engineered backwards from one question: what actually breaks when you climb?
Most collagen is built for skin. Ours is built for the tissue that fails when you crimp, the A2 pulley, the flexor tendons that barely get blood flow, the joints that take every ounce of your bodyweight through two pads of a hold.
That's why Crux is dosed the way it is: 15g of collagen for the raw material, vitamin C to actually build it, and Boswellia to calm the inflammation without shutting down repair. It's made for the hands you climb with, not the face you post with.
The CRUX Mechanism
Your tendons can't keep up
On a half-pad crimp, two fingers hold your entire bodyweight , almost no tissue in the body takes that kind of load. But finger tendons and pulleys are nearly avascular: they barely get blood, so they rebuild slowly and run chronically short on raw material. Climb hard week after week and the damage stacks faster than your fingers can repair it.
Beauty collagen & ibuprofen miss
Beauty collagen is dosed for skin, not the ~15g your tendons actually need, so it never reaches the tissue that's failing. And ibuprofen, the climber's reflex, is worse than useless here: it blunts the exact inflammatory signaling your tendon uses to start repairing. You mask the ache and quietly slow the healing at the same time.
Supply, build, strengthen, protect
Crux is engineered backwards from that problem. Collagen floods your system with the glycine and proline tendons are built from, vitamin C lets your body actually assemble it, copper cross-links it into strong, load-bearing fiber, and Boswellia calms the pain through a different pathway (5-LOX), relief without stalling repair.
Your tendons can't keep up
On a half-pad crimp, two fingers hold your entire bodyweight , almost no tissue in the body takes that kind of load. But finger tendons and pulleys are nearly avascular: they barely get blood, so they rebuild slowly and run chronically short on raw material. Climb hard week after week and the damage stacks faster than your fingers can repair it.
Beauty collagen & ibuprofen miss
Beauty collagen is dosed for skin, not the ~15g your tendons actually need, so it never reaches the tissue that's failing. And ibuprofen, the climber's reflex, is worse than useless here: it blunts the exact inflammatory signaling your tendon uses to start repairing. You mask the ache and quietly slow the healing at the same time.
Supply, build, strengthen, protect
Crux is engineered backwards from that problem. Collagen floods your system with the glycine and proline tendons are built from, vitamin C lets your body actually assemble it, copper cross-links it into strong, load-bearing fiber, and Boswellia calms the pain through a different pathway (5-LOX), relief without stalling repair.
What Our Repeated Customers Are Saying
Karen W.,
Verified Buyer
I'm 39 and my hands used to wake up before I did — stiff, puffy, cranky for the first hour every morning. That's what sold me on doing this daily instead of just on climb days. A month in and the morning stiffness is mostly gone, and hard sessions don't leave my fingers throbbing for three days after. Genuinely the first thing that's made a difference I can feel.
Danny K.,
47
Verified Buyer
When you're projecting, your fingers are always the bottleneck, not the power, not the beta, just skin and tendons that can't keep up. Been on CRUX for about 10 weeks and the recovery between sessions is night and day. I can add volume without my pulleys screaming at me. Taste is clean, mixes fine, and I don't skip a day.
Marcus C.,
Verified Buyer
Tweaked my A2 pulley last spring and it just… wouldn't quit. Every session it'd flare back up and I'd back off crimps like a coward. Started CRUX daily about two months ago and the constant ache is basically gone, I actually trust that finger on small holds again. I drink it every morning whether I'm climbing or not now. It's part of the routine.
Our Key Ingredients
The raw material your finger tendons and pulleys are literally built from. Hydrolyzed into tiny peptides so it absorbs fast and reaches the connective tissue that crimping breaks down, at a real 15g dose, not a beauty-collagen sprinkle.
Your body physically can't assemble collagen without it, it's the required cofactor for the enzyme that builds new fiber. Pairing it with the peptides is what turns raw material into actual tendon repair instead of wasted protein.
Calms inflamed, aching fingers through the 5-LOX pathway rather than the one ibuprofen hits, so you get real relief without blunting the inflammatory signaling your tendons need to start healing.
A trace mineral that powers the enzyme that cross-links fresh collagen into strong, load-bearing fiber. It's the difference between soft filler and tendon that can actually take a hard crimp.
Your Kiyss Journey
First 30 Days
Your first real win
The morning stiffness is mostly gone and your hands feel like yours again. Hard sessions still leave a mark, but they settle overnight instead of nagging for days.
Month 3
The shift others notice
Now the rebuild shows up under load, not just at rest. Crimps feel more supported and you bounce back fast enough to actually add volume instead of babying your fingers.
Month 6
Fully settled
Full payoff: your hands stop being the weak link in the chain. You climb to the limit of your strength and skill, not the limit of what your tendons can take.
Month 12
Compounding bonus
From here it's protection, not repair. The daily damage stops stacking up, and steady support helps your tendons hold up season after season.
Kiyss Vs.Them
Kiyss Vs.Them
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Kiyss
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Generic Collagen
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Dosed for finger tendons
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Vitamin C for maximum collagen absorption
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Boswellia (anti-inflammatory)
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Built for climbers
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Safe for daily long-term use
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How To Consume
Scoop
One scoop of Crux daily.
Mix
Stir into water or juice; takes 20 seconds.
Make it a ritual
Same time every day, with your morning coffee or first glass of water. Climb day or rest day, it doesn't matter.
Scoop
One scoop of Crux daily.
Mix
Stir into water or juice; takes 20 seconds.
Make it a ritual
Same time every day, with your morning coffee or first glass of water. Climb day or rest day, it doesn't matter.
Frequently Asked Questions
Isn't collagen only proven for skin, not tendons?
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Fair. Most collagen studies (and most collagen products) are aimed at skin, because that's where the beauty market is. But your skin, tendons, and pulleys are all built from the same material: collagen. The difference isn't the collagen, it's whether you give your body enough of it and the cofactor it needs to actually use it. That's why CRUX pairs a real 15g dose with vitamin C, the nutrient your body physically requires to assemble collagen into new connective tissue. No supplement rebuilds a torn pulley on its own. What CRUX does is supply the raw material your hands are chronically short on, every single day.
I've tried collagen before and honestly felt nothing.
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Almost every "collagen felt like nothing" story comes down to three things: the dose was too low (most beauty collagen is 2.5 to 5g, a fraction of what connective tissue needs), there was no vitamin C to actually use it, and it was taken for two weeks then dropped. Tendons rebuild on a timeline of weeks to months, not days, so anyone quitting early feels nothing by definition. CRUX fixes the first two (15g plus vitamin C), and the 90-day guarantee is there so you actually give the third one a chance.
I've tried everything, ice, rest, tape, massage, and nothing works. Why would this?
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Because almost everything on that list is either mechanical (ice, tape, rest) or masking (ibuprofen). None of them give your body the raw material to rebuild. They manage the symptom; they don't feed the repair. CRUX works on the input side: it supplies what your tendons are made of so they can keep up with what you're asking of them. It's not another protocol competing with your rehab. It's the missing supply behind it.
Isn't this just an expensive way to eat protein?
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Whole protein is great and you should keep eating it. But collagen peptides are specifically rich in glycine and proline, the amino acids connective tissue is actually built from, and a regular protein shake is low in both. Add the vitamin C cofactor and you've got a targeted input for tendons, not a general one. Compared to a single PT copay, an MRI, or weeks off the wall, a daily scoop is the cheap insurance.
Can't I just take ibuprofen when my fingers hurt?
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You can for the ache, but be careful: NSAIDs like ibuprofen blunt the exact inflammatory signaling your tendon uses to start repairing. You numb the pain and quietly slow the healing at the same time. CRUX uses AKBA-standardized Boswellia, which calms the everyday aches through a different pathway (5-LOX), so you get relief without shutting down repair.
How is this different from the beauty collagen at the drugstore?
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Dose, cofactor, and intent. Beauty collagen is formulated and dosed for skin. CRUX is dosed for the loads climbing puts on tendons and pulleys: 15g of hydrolyzed peptides, vitamin C to make it usable, Boswellia for training aches, and trace copper for cross-linking. Same category of ingredient, built for a completely different job.
How long until I actually notice something?
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Most people feel less daily stiffness within the first couple of weeks, with clearer recovery around the one-month mark. The deeper rebuild keeps compounding across 3 to 6 months of daily use, which is exactly why we give you a 90-day window to judge it instead of a week.