Certified Grass-fed Whey Protein Isolate
Certified Grass-fed Whey Protein Isolate
Pure, clean protein with nothing to hide. Sourced from pasture-raised, grass-fed dairy herds in the lush fields of Southeast Ireland, this whey isolate is processed using an advanced ice-cold cross-flow microfiltration system to remove fat, carbs, and lactose, leaving you with 27g of high-quality protein per serving.
It’s unsweetened and free from additives, flavorings, dyes, fillers, heavy metals, hormones, and artificial ingredients, delivering unmatched purity, absorption, and results. Easy on the stomach and blending seamlessly into any drink, it’s ideal for building lean muscle, accelerating recovery, and fueling your day without bloating or aftertaste.
For those who want to boost their workouts and daily protein intake without compromising on quality, Centenarius Whey Protein isn’t just a single, ingredient protein, it’s the best ingredient protein.
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Ingredients
Ingredients
100% Certified Grass-fed Whey Protein Isolate. <1% Non-GMO Sunflower Lecithin.
*Contains: Milk
Processing Method
Processing Method
Utilizing patented ice-cold cross-flow microfiltration, this whey protein isolate removes all fat, carbs, and lactose while retaining native and undenatured proteins for easy digestion and absorption.
Why Centenarius?
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.
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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.

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, hormones, and lactose. 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.

Native and Undenatured

No Artificial Flavors/Colors

No Growth Hormones

Gluten & Soy Free

Easy Digestible

Cold Filtered
Frequently Asked Questions
Is your protein powder safe for pregnant women?
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?
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 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?
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?
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?
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?
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?
What makes Centenarius Protein the best?
It’s 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?
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?
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.