Official Website of Lean Science™ Grass Fed Whey Protein Mix


Lean Science Grass Fed Whey Protein is sourced from 100% grass fed cows. No hormones, no antibiotics, no chemicals.


Lean Science - Grass Fed Protein

Purity’s Grass Fed Protein contains one hundred percent whey protein from grass fed cows. Whey protein is a complete source of all essential amino acids the body requires to meet its protein needs. Widely regarded as one of the best protein sources available, whey protein is also one of the most digestible proteins.*

Among its other benefits, research suggests whey protein helps with: appetite control, weight management, exercise performance, recovery from athletic activity, maintenance of muscle mass and strength.*

Grass Fed Protein is enhanced with Aminogen®, a patented enzyme system designed to support protein digestion and absorption of amino acids from dietary protein.*

Muscle Mass & Strength*
Weight Management*
Exercise Performance*
Healthy Immunity*
Health and Wellness*
Brain Health*


Why Grass Fed Whey Protein?

More than just a dietary supplement, whey protein is a functional food that helps support a healthy body weight, promotes muscle mass and provides a number of health and well-being benefits. Many of the benefits of whey protein are directly related to its complete amino acid profile, which makes it a high-quality, easily digestible protein source.

There are a lot of whey protein powders on the market today, but the majority come from cattle fed with grains, often corn mash, a low nutrient waste product of ethanol manufacturing.

Lean Science Grass Fed Whey Protein represents the next generation in natural protein supplementation. Protein is an essential nutrient, and Lean Science whey protein is of the highest quality and is grass-fed derived.

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Whey and Your Workout

Whey is considered a fast-acting protein because the body digests it quickly and easily. That makes whey especially beneficial for supporting muscle strength, in conjunction with regular strength training. Whey also helps support healthy weight management because of its protein rich, low carbohydrate make up.

  • Promotes Lean Muscle*
  • Supports Muscle Strength and Power*
  • Promotes Healthy Dieting and Satiety*
  • Awesome tasting in Milk or Water
  • Great After Workouts or as a Healthy Snack

Milk from grass fed cows, by comparison, has been measured as being up to 4 times higher in important omega-3 fatty acids when compared to milk from grain fed cattle. And this superior fatty acid profile is just the start of the many health benefits of milk from grass fed cows.

  • Are the cows raised in an area free of industrial pollution?

    Yes, the pastures where our cows are raised, are free of harmful industrial pollutants.

  • What, if anything, are the cows fed in addition to grass?

    Our cows are 100% grass fed. NO additional grains are fed to these animals.

  • Are the cows maintained without any antibiotics or hormones?

    Absolutely, our cows are completely free of antibiotics and hormones including rBGH and rBST.

  • Does your whey contain lactose?

    Any kind of whey protein, including Purity’s Grass Fed Whey Protein will retain trace amounts of lactose.

Choose the Flavor that is Best For You

Super Delicious Vanilla Ice Cream Flavor



Utterly Decadent Dutch Chocolate Flavor