__label: BUY 1 GET 1 50% OFF

Casein
Protein

8-Hour Sustained-Release Protein

Casein protein takes longer to digest, which means it feeds hard-playing muscles over an extended period, making it the perfect tool for athletic recovery. Don’t just sleep—chase your dreams.

$19.99
Triple Chocolate
Casein Protein

We have a new look!
You may receive either package during this transition.

Free Shipping on orders over $49

Free shipping on orders over $30

30-Day Return Policy

30-day return policy

100% Secure Payment

100% Secured
Payment

Why should I buy this?

Outwork. outplay. outshine

Developed exclusively for athletes to deliver the fuel and nutrients needed for every kick-off, tip-off, or face-off. 

Support Muscle Building

Go the distance in- and off-season. The high-quality casein will help you build lean muscle when it matters most. 

Support
Recovery

Get back into the gym and onto the field faster with a BCAA-loaded formula. 

Sustained
Release

Support performance, even while you sleep.

UNBEATABLE
FLAVOR

Winning has a distinct flavor. Enjoy the sweet taste of victory with SIXSTAR’s award-winning Triple Chocolate.

WHAT’S INSIDE THE BOTTLE?

get to know the lineup

The best teams have chemistry. Check out the standouts on the Casein Protein Plus roster.

24G

Casein Protein

Build Muscle

Casein is a savvy veteran and an enduring winner. Unlike whey, which is quickly absorbed, casein protein takes longer to digest, feeding your muscles over an extended period of time. It’s also considered anti-catabolic as it supplies a steady and prolonged release of amino acids.  

Sustained-Release Formula

Supplement with casein

When you supplement with casein, the level of amino acids in your blood and the protein synthesis in your body peak within three to four hours. Because of casein’s slow digestion rate, it is usually recommended for overnight use. This way, you’re putting in the work and chasing your dreams—even when you’re asleep.

Casein Protein - Triple Chocolate

5G

BCAAs

Support recovery

BCAAs are natural born catalysts, those players on your roster who inspire everyone to be stronger. Their job is to boost muscle protein synthesis, to rebuild and grow your lean muscle tissue more effectively. They support rapid muscle recovery from intense training to grow back larger and stronger. Every serving of Casein Protein Plus delivers 5g, to help keep your recovery strong. 

Casein Protein - Triple Chocolate

24G

Casein Protein

Build Muscle

Casein is a savvy veteran and an enduring winner. Unlike whey, which is quickly absorbed, casein protein takes longer to digest, feeding your muscles over an extended period of time. It’s also considered anti-catabolic as it supplies a steady and prolonged release of amino acids.  

Sustained-Release Formula

Supplement with casein

When you supplement with casein, the level of amino acids in your blood and the protein synthesis in your body peak within three to four hours. Because of casein’s slow digestion rate, it is usually recommended for overnight use. This way, you’re putting in the work and chasing your dreams—even when you’re asleep.

5G

BCAAs

Support recovery

BCAAs are natural born catalysts, those players on your roster who inspire everyone to be stronger. Their job is to boost muscle protein synthesis, to rebuild and grow your lean muscle tissue more effectively. They support rapid muscle recovery from intense training to grow back larger and stronger. Every serving of Casein Protein Plus delivers 5g, to help keep your recovery strong. 

Supplement Facts

Triple chocolate

Supplement Facts: Casein Protein - Triple Chocolate

who is sixstar for?

athletes who

make it happen

If the extra mile were a place on a map, SIXSTAR would hold naming rights. For more than a decade, we’ve offered clinically dosed sports performance products custom formulated for athletes that go longer, work harder, and give more than anyone else. 

Football Player

who is sixstar for?

athletes who

make it happen

If the extra mile were a place on a map, SIXSTAR would hold naming rights. For more than a decade, we’ve offered clinically dosed sports performance products custom formulated for athletes that go longer, work harder, and give more than anyone else. 

where?

take six star

everywhere

At home or on the road, SIXSTAR goes anywhere you do. Looking to improve your game? It’s the perfect companion on the journey to be your best. 

At the gym

on the field

on the court

on the pitch

at the ballpark

at the track

T.J. Watt - Defensive Player of the Year

where?

take six star

everywhere

At home or on the road, SIXSTAR goes anywhere you do. Looking to improve your game? It’s the perfect companion on the journey to be your best. 

At the gym

on the field

on the court

on the pitch

at the ballpark

at the track

frequently asked questions

we've got answers

How do I take Casein Protein Plus? 

For best results, SIXSTAR Casein Protein Plus should be taken at bedtime. But it can also be taken post-workout, or between meals. Stir, blend, or shake in a shaker cup with water or milk.  

Who is Casein Protein Plus for? 

SIXSTAR Casein Protein is formulated for athletes who take their performance seriously. If you’re looking for every edge you can get, this formula is purpose-built to improve performance when you need it most. 

Can I take Casein Protein Plus every day? 

Yes, SIXSTAR Casein Protein Plus is safe to be taken every day to accompany your daily training regimen.  

What’s the difference between casein protein and whey protein? 

Casein protein takes longer to digest and absorb, which means it feeds your muscles over an extended period of time—unlike whey protein, which is fast-absorbing, quick fuel on the go. 

frequently asked questions

we've got answers

How do I take Casein Protein Plus? 

For best results, SIXSTAR Casein Protein Plus should be taken at bedtime. But it can also be taken post-workout, or between meals. Stir, blend, or shake in a shaker cup with water or milk.  

Who is Casein Protein Plus for? 

SIXSTAR Casein Protein is formulated for athletes who take their performance seriously. If you’re looking for every edge you can get, this formula is purpose-built to improve performance when you need it most. 

Can I take Casein Protein Plus every day? 

Yes, SIXSTAR Casein Protein Plus is safe to be taken every day to accompany your daily training regimen.  

What’s the difference between casein protein and whey protein? 

Casein protein takes longer to digest and absorb, which means it feeds your muscles over an extended period of time—unlike whey protein, which is fast-absorbing, quick fuel on the go. 

can i stack this?

set your lineup

Developed for athletes, these great products make for greater additions to your game day roster, helping you to maximize your performance on the field, the court—or the rink.

Sale Off
100% Whey Protein Plus - Strawberry Smoothie

Supports musclebuilding

  • Fast-absorbing 100% whey protein

  • BCAAs to fuel recovery

  • Provides your daily value for vitamin C and zinc

Sale Off
Pre-workout Explosion - Fruit Punch

For EVeryday Performance

  • Increase Energy

  • Intense Pumps

  • Support Muscle Growth 

Sale Off
100% Creatine

Get bigger and stronger

  • Increase Strength

  • 100% Ultra-pure creatine monohydrate

  • No fillers or additives

REVIEWS

BECOME A SIXSTAR INSIDER

Subscribe to the official newsletter and receive exclusive info on giveaways, nutritional advice, training tips, and more.