⭐⭐⭐⭐⭐
4,200+ Fighters Trust This
WHAT YOUR
SKIN BRAND
DIDN'T TELL YOU
Skin brands got rich selling you collagen for your face.
Your tendons are 80% collagen and take months to heal.
Nobody built this for fighters. Until now.
20g Per Serving
Hydrolysed · Fast-Absorbing
NSF Certified
Unflavoured · Mixes Clear
BUILD YOUR TENDONS →
Ships in 24 hours · Free over $60
WHAT IS IT?
THE SUPPLEMENT THE BEAUTY INDUSTRY
KEPT TO THEMSELVES
Collagen is the structural protein your tendons, ligaments, and joints are built from. Up to 80% of every tendon in your body is collagen.
Which means every time you roll, spar, or drill — every grip you fight for, every clinch you absorb — you are breaking down the exact protein your body needs most and replacing it the slowest.
The beauty industry figured this out years ago. Skin brands have been selling collagen to women for their faces since before you started training.
What they quietly left out: your tendons need it more than your skin does.
80%
of your tendons
is collagen
is collagen
20g
collagen per
serving
serving
18
amino acids
per scoop
per scoop
8wk
clinical evidence
timeline
timeline
THE SCIENCE
THE WINDOW YOUR TENDONS OPEN
AFTER EVERY SESSION
There is a 60-minute window after loading your joints where tendon cells actively recruit repair material. Most fighters miss it every single time.
01
Training loads the tendon. Mechanical stress creates a signalling cascade in connective tissue cells — they fire a repair signal that lasts approximately 60 minutes.
02
The window is open — but empty. Most fighters' bodies have no raw material circulating to answer the signal. No glycine. No proline. No hydroxyproline. The signal fires. Nothing comes.
03
Take Rounds Rebuild 30 minutes before training. The hydrolysed peptides absorb fast and circulate during the loading window — exactly when tendon cells need them. The signal fires. The material is there.
04
Over 8 weeks: measurable structural change. Published research shows increased tendon cross-sectional area and stiffness in athletes supplementing collagen with mechanical loading. This is not a wellness claim. This is published evidence.
📄
Based on Shaw et al. (2017) and multiple peer-reviewed RCTs on collagen + mechanical loading. We cite our sources. Always.
THE DIFFERENCE
EVERY OTHER COLLAGEN IS
SOLD TO SOMEONE ELSE
Beauty Collagen
- ✕ Engineered for skin elasticity
- ✕ Marketed to women for their face
- ✕ No pre-training timing protocol
- ✕ No fighter-specific dosing
- ✕ Zero tendon-recovery framing
- ✕ Not built for you
Rounds Rebuild
- ✓ Engineered for tendons & connective tissue
- ✓ Built for people who train to fight
- ✓ 30-min pre-training protocol
- ✓ 20g per serving — the clinical dose
- ✓ Proof-first. We cite every claim.
- ✓ Built for you
WHEN WILL I FEEL IT?
THE LONG GAME.
BUILT FOR FIGHTERS WHO PLAY IT.
Fighters who win the long game are the ones still training at 45. Here's what the research and our fighters actually report:
WEEK 1–2
The protocol builds. Collagen peptides begin accumulating and reaching connective tissue. No dramatic change yet — this is foundation loading. Take it consistently.
WEEK 3–4
Joint soreness starts to ease. Most users report reduced morning stiffness and less soreness after hard sessions. The chronic ache that defined every Monday morning starts to fade.
WEEK 6–8
The structural shift. This is where research puts the measurable tendon changes — increased cross-sectional area, improved stiffness, faster recovery. The session you should have been too sore for — and weren't.
MONTH 3+
You stop thinking about it. The chronic finger. The shoulder that clicks. The knee you tape without thinking. They become background noise instead of reasons to skip training.
FROM THE MAT
WHAT FIGHTERS
ARE SAYING
★★★★★
"Six weeks in and Monday morning doesn't feel like a punishment anymore. My fingers have never felt this good mid-camp."
BJJ Blue Belt · 4×/week
★★★★★
"Shoulder was getting bad — couldn't press without clicking. Two months on Rounds and it's 80% better. The pre-training timing made the difference."
Boxing · Amateur · 5×/week
★★★★★
"40 years old, Muay Thai 3× a week. Recovery used to take 2 days. Now it's one. A brand that cites studies is a brand I trust."
Muay Thai · 3×/week
THE PROTOCOL
SIMPLE.
ON PURPOSE.
⏱
30 MIN BEFORE TRAINING
One scoop (20g) in water, juice, or your pre-training shake. Collagen taken before mechanical loading is significantly more effective than after.
📅
EVERY TRAINING DAY
Consistency beats intensity. Daily supplementation with mechanical loading is the protocol the studies used. Miss training? Take it before any physical activity.
🍋
ADD VITAMIN C
Vitamin C is a co-factor for collagen synthesis — your body needs it to use what you're taking. Orange juice works. A vitamin C tablet works. Don't skip it.
GET STARTED
CHOOSE YOUR
SUPPLY
The research protocol is 8 weeks minimum. We built the bundles around that.
MOST POPULAR
PROTOCOL
2 Month Supply
$79.99
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BUILD THE HABIT
🛡
Train-On-It Guarantee
Train 3 sessions and don't feel a difference — full refund. No forms. No questions. We're fighters too.
✓ NSF Certified
✓ Hydrolysed · Grass-Fed
✓ Ships in 24h
✓ Free over $60
✓ 30-Day Guarantee
STRAIGHT ANSWERS
QUESTIONS FROM
THE MAT
Will this break a drug test?
No. Rounds Rebuild contains nothing on the WADA or USADA banned list. It is NSF Certified for Sport — the certification athletes competing at tested levels specifically look for. Hydrolysed bovine collagen is a food-derived protein. Nothing more.
Why take it before training and not after?
The mechano-transduction window. Exercise creates a signalling cascade in tendon cells that lasts approximately 60 minutes post-loading. If the collagen peptides are already circulating when that window opens, the cells have raw material to work with. Shaw et al. (2017) demonstrated this directly.
I already take protein powder. Do I still need this?
Yes — they do completely different things. Protein powder targets muscle fibre. Tendons respond to a different set of amino acids: glycine, proline, and hydroxyproline. Your whey has almost none of these. This fills the gap your protein shake ignores.
How long before I feel results?
Most users report reduced joint soreness in weeks 3–4. The structural changes the research documents — measurable at 8–12 weeks — take longer because tendons remodel slowly. This is the long game. If you train for years, you need a supplement that thinks in years too.
Can I mix it with my pre-workout?
Yes. Rounds Rebuild is unflavoured and mixes clear in water, juice, or your existing pre-training drink. No taste. No grit. Take it 30 minutes before you train.
I'm not a professional fighter — is this for me?
Absolutely. Rounds Rebuild is built for everyone who trains to fight — the BJJ hobbyist, the recreational boxer, the Muay Thai practitioner who goes 3 nights a week after work. Your tendons take the same damage whether or not you compete.
MAKE THE CALL
FIGHTERS DON'T RETIRE FROM AGE.
THEY RETIRE FROM INJURY.
One scoop. Thirty minutes before you train. Every session. The fighters who play the long game are the ones still on the mat at 45.
START THE PROTOCOL →Train-On-It Guarantee · NSF Certified · Ships in 24h