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Certified Grass-fed Whey Protein Isolate

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Whey protein should mean whey protein, and nothing else.

No sketchy additives. No dyes. No laundry list of ingredients you can't pronounce.

No artificial sweeteners that leave your protein powder tasting disgustingly sweet (or like chemicals).

That's why our whey isolate has only one main ingredient, with no added sweeteners (certified grass-fed, lactose-free whey isolate).

Let’s be clear: This is not just a single-ingredient protein...

...this is the best ingredient protein.

At Centenarius, we are proud to present the only whey protein isolate available today that is:

  • Truly Certified Grass-Fed 
  • From pasture-raised animals
  • Heavy Metals Tested
  • Native Undenatured
  • Easily digestible
  • Hormone-free
  • Additive-free
  • Lactose-free
  • Gluten-free
  • Soy free


Centenarius offers an exceptionally clean flavor alongside an incredibly fast metabolizing boost of power with 27g of pure protein. This lactose-free, unsweetened whey protein isolate is without any additives or fillers – providing zero bloating or aftertaste, all with superior results and outstanding flavor that mixes with anything.

Our Whey Protein Isolate is drastically ahead of the competition compared to any other protein product on the market. Our whey protein isolate is derived directly from Truly Grass-Fed Irish dairy.  

Centenarius delivers unmatched purity, undeniable results, and the peace of mind that can only come with a product that is sourced purely, ethically, and sustainably from small farms within the virgin fields of Ireland.

Our patented ice-cold cross flow micro-filtration system removes all fat, carbs, and lactose ensuring a non-bloating and easily digestible form of protein, that is beyond clean. Superior quality with a better amino acid profile and more calcium. 

This ultra-efficient protein is designed to increase power, fuel workouts, build lean muscle, promote weight loss, and aid in recovery. All without any additional fillers, flavorings, sweeteners, and processed ingredients that are best to avoid.

Unsurpassed purity, absorption, and effectiveness. 

It's not only the quality of what you put in, it's what you leave out!

Try our lactose-free whey protein isolate today and see for yourself, your stomach might even thank you.

Let’s be clear: This is not just a single-ingredient protein...

...this is the best ingredient protein.

At Centenarius, we are proud to present the only whey protein isolate available today that is:

  • Truly Certified Grass-Fed 
  • From pasture-raised animals
  • Heavy Metals Tested
  • Native Undenatured
  • Easily digestible
  • Hormone-free
  • Additive-free
  • Lactose-free
  • Gluten-free
  • Soy free


Centenarius offers an exceptionally clean flavor alongside an incredibly fast metabolizing boost of power with 27g of pure protein. This lactose-free, unsweetened whey protein isolate is without any additives or fillers – providing zero bloating or aftertaste, all with superior results and outstanding flavor that mixes with anything.

Our Whey Protein Isolate is drastically ahead of the competition compared to any other protein product on the market. Our whey protein isolate is derived directly from Truly Grass-Fed Irish dairy.  

Centenarius delivers unmatched purity, undeniable results, and the peace of mind that can only come with a product that is sourced purely, ethically, and sustainably from small farms within the virgin fields of Ireland.

Our patented ice cold cross flow micro-filtration system removes all fat, carbs, and lactose ensuring a non-bloating and easily digestible form of protein, that is beyond clean. Superior quality with a better amino acid profile and more calcium. 

This ultra-efficient protein is designed to increase power, fuel workouts, build lean muscle, promote weight loss, and aid in recovery. All without any additional fillers, flavorings, sweeteners, and processed ingredients that are best to avoid.

Unsurpassed purity, absorption, and effectiveness. 

It's not only the quality of what you put in, it's what you leave out!

Independent 3rd party test resultsAnimal Welfare Certificate

Customer Reviews

Based on 34 reviews
85%
(29)
3%
(1)
12%
(4)
0%
(0)
0%
(0)
S
Scott Hunter
Best protein powder

Just the taste alone - or really the absence of it - makes this protein powder my absolute favorite.

B
Brijit Griffith
The only protein powder we use!

Protein powder is pricey and it sucks when you commit to a bag that tastes weird, doesn’t dissolve in water and leaves a film in your mouth.. well this product is NONE of those things!!! It’s truly neutral in flavor and mixes so easily shaken in water and I feel energized after having it!
Thanks for cracking the code, y’all! You have a huge fan in me and my boyfriend!

A
AnnaMia Muller
Great quality and delicious!

I love this product, it’s so creamy, tastes good, easily dissolves, perfect! Will keep ordering.

G
Graham Weiss
Cleanest Protein Powder...ever

No aftertaste. No chemical 'Red Bull' taste. Just PURE protein.

I drink it EVERY day

T
T.T.

Best protein I’ve found yet. Most easily digestible by far, mixes perfectly with raw milk