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MUSCLE NATION

Muscle Nation at Sprint Fit


Muscle Nation is one of Australia's fastest-growing active lifestyle brands, known for its incredible protein flavours, innovation, and functional health formulas. From Protein Water to Custard Casein, every supplement is designed to taste amazing and work harder. Shop Muscle Nation at Sprint Fit — New Zealand’s number one specialist online sports nutrition store.


Sprint Fit Favourites from Muscle Nation

 

  • Protein Water – Clear, refreshing collagen + whey protein isolate with added electrolytes. Light on the stomach and packed with fruity flavours. Perfect post-workout or on-the-go.
  • Custard Casein Protein – A slow-release protein that mixes into a creamy, dessert-like custard. Ideal as a nighttime snack or high-protein treat.
  • Whey Protein Isolate (WPI) – Lean, fast-digesting protein with digestive enzymes, low lactose, and gourmet flavours like Choc Honeycomb and Caramel Swirl.

Why We Love Muscle Nation at Sprint Fit


Muscle Nation proves that supplements can taste epic and still deliver clinical performance. With a cult-like following, iconic dessert-style proteins, and constant innovation — it’s one of the most loved lifestyle brands we stock.

Muscle Nation FAQs
What’s the difference between Protein Water and WPI?

Protein Water is a lighter, collagen-infused drink with electrolytes. WPI is a more traditional whey isolate with rich flavour and added enzymes.

Can I use Custard Casein Protein during the day?

Yes — it’s slow-digesting and great any time, but especially popular before bed as a high-protein dessert. 

Is Muscle Nation WPI suitable for lactose-sensitive users?

It’s low in lactose and contains digestive enzymes to support better absorption and digestion. 

Is Protein Water good after cardio?

Absolutely — it's hydrating, light, and helps replenish protein and electrolytes post-cardio or HIIT. 

Can I mix Custard Casein with milk or water?

Yes — both work well, but milk will create a thicker, creamier texture. Water gives a lighter consistency. 

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