certified grass fed whey protein isolate Centenarius Nutrition 27g protein non-GMO gluten free zero additives unflavored product of Ireland manufactured in USA

grass fed whey protein isolate lactose free zero carbs zero fat cold processed no heat damage pure amino acids Centenarius Nutrition

certified grass fed whey protein isolate Centenarius Nutrition zero bloating zero fillers no artificial flavors

Grass fed whey protein isolate clean label one ingredient no fillers

Back of the Centenarius Grass-Fed Whey Protein Isolate pouch with nutrition facts

Certified Grass-fed Whey Protein Isolate

Name: Certified Grass-fed Whey Protein Isolate
Brand: Centenarius Nutrition
SKU: CEN-WHEY
Price: 55.9 USD
Availability: InStock
Rating: 4.8 (54 reviews)

Rated 4.8 (18,527+)

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BESTSELLER OF 2026

Performance Without Compromise

$55.90

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Protein powder that actually delivers what it promises. 27g of grass-fed whey from Irish pastures, pure protein that your body can actually use.

✓ Build Lean Muscle with Zero Bloating
✓ One Clean Ingredient. No Fillers.
✓ Faster Recovery So You Can Train Harder
✓ 3rd-Party Tested for Heavy Metals

Purchase Options

One-time Purchase

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Delivery Frequency

Monthly Delivery - 10% off every order

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"Taste great and I feel even better. Never any bloating and I can’t imagine drinking anything else."

Jackie H.

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Ingredients

100% Certified Grass-fed Whey Protein Isolate. <1% Non-GMO Sunflower Lecithin.

*Contains: Milk

Processing Method

Utilizing patented ice-cold cross-flow microfiltration, this whey protein isolate removes virtually all fat, carbs, and lactose while retaining native and undenatured proteins for easy digestion and absorption.

Why Centenarius?

Centenarius offers the purest protein sourced from Irish grass-fed, pasture-raised animals. Our commitment to sustainability, animal welfare, and product purity ensures a clean, effective, and ethical protein choice.

Lab Results

Independent 3rd-party lab report (PDF)

Manufactured to cGMP standards in FDA-registered facilities.

Heavy Metals Tested

Hormone Free

Additive Free

Non-Bloating

Product of Ireland

Manufactured in the USA

How to Use

Mix 2 scoops (30g) with 8–10 oz of cold water, milk, or your favorite smoothie.

Shake or blend until fully dissolved. Unflavored, so it works in coffee, oats, or baking too.

Take within 30 minutes of training, or anytime you need clean protein on the go.

Third-Party Testing and Certifications

Unmatched Purity and Ethical Sourcing

Our protein is tested by independent third parties to ensure unmatched purity, safety, and effectiveness. Additionally, Centenarius proudly holds an Animal Welfare Certificate, proving our commitment to ethical sourcing from pasture-raised, grass-fed cows in Ireland.

Independent 3rd party test results

Animal Welfare Certificate

Native and Undenatured

No Artificial Flavors/Colors

No Growth Hormones

Gluten & Soy Free

Easy Digestible

Cold Filtered

Load video: Certified Grass-fed Whey Protein Isolate

Optimized for Peak Performance

Fuel Your Workouts and Recovery

Designed to enhance physical performance, Centenarius Whey Protein Isolate is ideal for building lean muscle, supporting weight management, and speeding up recovery. With 27 grams of pure protein per serving, this fast-absorbing formula provides clean energy without unnecessary additives or fillers, ensuring zero bloating or aftertaste.

Our whey protein isolate stands out with its Certified Grass-Fed, pasture-raised sourcing from Ireland, free from heavy metals and hormones, and virtually lactose-free. Using a patented ice-cold cross-flow microfiltration system, we deliver a protein that is easily digestible and highly bioavailable, making it perfect for fueling your workouts and achieving your fitness goals.

Unmatched Quality with Every Scoop

Crafted for Those who Value Purity

Is your protein powder safe for pregnant women?

Yes, our protein powder is made from the highest-quality ingredients with no fillers or additives. Whey is generally considered safe during pregnancy, but it's always best to consult with your healthcare provider before adding supplements to your diet.

Is WPI (Whey Protein Isolate) safe for kids?

Yes, protein powder provides similar benefits to kids as it does for adults. However, protein powder should not replace whole food protein sources in a child’s diet. Consult with a pediatrician to determine the proper dosage based on age and nutritional needs.

Whey Isolate vs. Whey Concentrate: What’s the difference?

Whey isolate has a higher protein content and lower amounts of lactose and fat, as it undergoes more filtration than whey concentrate, which contains more lactose, fat, and carbohydrates.

How much protein should I consume daily?

Protein needs vary by age, weight, activity level, and health status. A general guideline is 0.8 grams of protein per kilogram of body weight, or 10-35% of daily calories from protein. Use our protein calculator for personalized recommendations.

What are the benefits of Whey Isolate?

Whey protein isolate supports muscle growth, recovery, and performance, aids in weight management, and provides a convenient protein source.

Can protein powder help with weight loss?

Yes, protein powder can promote satiety, preserve lean muscle, and support balanced nutrition when used as part of a healthy lifestyle.

How should protein powder be consumed?

Mix it with water, milk, or other liquids, or add it to smoothies, shakes, or recipes. Follow the serving size on the label.

What makes Centenarius Protein the best?

It’s virtually lactose-free, soy-free, sugar-free, made from pasture-raised animals, and tested for heavy metals. Our unsweetened whey isolate contains no additives or fillers, resulting in zero bloating or aftertaste.

What’s the difference between grass-fed in the USA vs. Ireland?

In Ireland, any product labeled "Grass-fed" must be at least 90% grass-fed, a standard not guaranteed in the U.S.

What makes Ireland so special for dairy?

Ireland's soil rests on limestone bedrock, meaning no chemical rebalancing is needed. Glyphosate is banned, making it one of the cleanest places for dairy production.

5 stars: 49 (91%)
4 stars: 1 (2%)
3 stars: 3 (6%)
2 stars: 0 (0%)
1 star: 1 (2%)

Some of the reviews shown are from related products the merchant grouped with this one.

Great tasting!

I've tried a bunch of different whey powders. This is easily the best tasting one. Zero after taste and it doesnt make me feel bloated. I usually use it after I workout rather than eating breakfast. I highly recommend.

The best!

Finally a Whey I can enjoy! All dairy products give me stomach bloating + cramps, NOT this Whey Isolate! It mixes great and doesn’t have any flavor so it blends with all my shakes/coffees/smoothies. I feel a big difference in recovery when I take it after my hard workouts, using also as a meal replacement!

Noticeably high quality Whey Isolate

Quickly became addicted to the fact it gives me zero bloating unlike every other Whey I’ve tried. Being in the gym 5 days a week I love that I can slam a shake post workout and I feel light enough to eat real food a couple hours later for big gains. Very helpful tool to hit my clean protein count for the day. Wifey loves it too in her smoothies. The powder even looks different than every other Whey I’ve tried.

Absolutely blew me away with the quality. Honestly how is this not more known? Truly incredible and high high sourcing quality. I just do it in my coffee and it’s perfect to start the day.

Unflavored Protein powder

This one is one of the best product I m using it from few months. The powder is very fine and I don’t feel any bloating . I am sure that I will never purchase any other brand after trying centenarius.

Wish it was flavored

The best product in the market (period)

Certified Grass-fed Whey Protein Isolate

I like the product but customer service is not exist. I emailed and called to change the address. They shipped several packages to the old address and I was never able to contact them to get a refund. I would not buy from this supplier again. It was an expensive mistake.

Great pure protein powdwr

This whey protein is an absolute game-changer for anyone serious about building muscle and recovering faster. It blends perfectly in just a shaker bottle with water or milk, creating a silky-smooth texture with no gritty residue or chalky aftertaste. With high-quality protein per serving, minimal fillers, and noticeable improvements in strength, energy, and muscle gains, it’s easily become my go-to supplement that delivers real results.

Certified Grass-fed Whey Protein Isolate

The Best.

This is the only protein powder I will buy and it has been a staple for me in my shakes for 3 years. I also use the glycine, and have just received rhe creatine (which I haven’t used yet).

Best protein supplement I’ve ever had

I noticed my muscle gains since the second week, which surprised me a lot in a great way. The fact that I get no bloating and no gases unlike other brands is a big plus.

Whey protein

Clean supplement. Tastes great. Amazing product.

doesn't upset my stomach

I love this whey isolate! It’s super clean and best of all, non-bloating. Mixes smoothly and feels really light on my stomach.

Doesn’t upset my stomach

Love this whey! It’s super clean, easy to digest, and doesn’t upset my stomach like other proteins. It mixes easily with anything and tastes pure. Thank you for such a good quality!

12/10 product 1000/10 customer service.

Kellie Review

I absolutely love the product!

Love it, but not the shipping

This is my favorite protein powder unfortunately it's not affordable for Canadians. I had to pay 40 shipping plus 60 duties.

Best whey I’ve had

No stomach Issues and no after taste

Fantastic Product - 6 out of 5 stars

I've been a customer for a while now, Centenarius is the only protein powder I will use. It's such a relief to take a great, effective product and not have to worry about any additives. Thank you for a great product.

Game changing protein

This protein is in a league of its own. It has all the right ingredients and mixes well with any liquid I use. Highly recommend to anyone looking for a solid protein substance!

Best Whey Protein Isolate on the market. I’ve tried so many health focused protein powders and this is the best. Clean ingredients, no artificial sweeteners is major nowadays.

Best Protein Powder

I love this protein powder. I recover from workouts faster than with others, it’s easy to digest and has no artificial sweeteners, colors or other ingredients you don’t want. It blends very easily and is a very “clean” protein to add to your diet.

best product

Servings are not correct. I kept track and they are way off.

Best protein powder

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

Good Quality, But Worth the Cost?

I like the quality profile and that it's unflavored, so can be added to a variety of shakes/smoothies. It mixes ok, but not as well as some others I've used. I'm not convinced it's worth the hefty cost beyond other whey powders. I've never had trouble digesting any whey powder, so that may be a big deal for some. I'm not sure I'll keep paying 2-3X for something that has no apparent 2-3X benefit over cheaper alternatives. But no question, it's a quality product.

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!