One of the best protein supplements you can use for your bodybuilding goals is without doubt a pure whey protein isolate. A whey protein isolate has the highest biological value(BV) of all proteins at 154 which means it's a fast/instant released protein as compared to a slow/timed released protein. That's the primary reason why a whey protein isolate is ideal post-workout notably when your muscle tissues are depleted and need to be repaired and rebuilt with fast-acting protein.

Your best buy would be a cross-flow microfiltered whey protein isolate which has been cold processed meaning no heating has been used thus preventing the protein from getting denatured.

One of the downsides of certain whey protein isolates is the use of artificial sweeteners like sucralose or acesulfame potassium and aspartame. Sucralose for instance is 600 times sweeter than table sugar. While artificial sweeteners main goal is obviously to give better taste and flavor to a product, they are still questionable for health and some people can't tolerate them due to certain side effects like headaches, migraines, blurred vision and dizziness. Thankfully, there are natural whey protein isolates for those who want to go the healthier route.

After research, here is a list of the top 25 whey protein isolate without sucralose or any artificial sweetener whatsoever. Most of these supplements don't have any sweetener at all whereas others are naturally sweetened with stevia(herbal leaf), luo han guo(monk fruit) or cane sugar.

(1) PROMIX:Undenatured Grass Fed Whey Isolate.Cold Processed with Multi-stage Micro-filtration.30G Protein/6.9G BCAA/.5G Fat/2G Carbs/Lactose<1g/serving.Easy to Mix.(5 lb bulk).69 Servings.Unflavored - contains no sweetener at all

PROMIX:Undenatured Grass Fed Whey Isolate.Cold Processed with Multi-stage Micro-filtration.30G Protein/6.9G BCAA/.5G Fat/2G Carbs/Lactose<1g/serving.Easy to Mix.(5 lb bulk).69 Servings.Unflavored

(2) NutraBio 100% Whey Protein Isolate - 5 pounds Unflavored - contains no sweetener at all

NutraBio 100% Whey Protein Isolate - 5 pounds Unflavored - NO Soy, NO Whey Concentrate, NO Amino Acid Spiking just 100% Pure WPI.

(3) Muscle Feast Pure Whey Protein Isolate Natural 5 Lbs - contains no sweetener at all

Pure WPI - Whey Protein Isolate Natural 5 Lbs

(4) Verum Labs Grass Fed Whey Protein Isolate: Undenatured and Cold-Processed, 0g Fat, <1g Carbs, 5lb, Non-GMO, Gluten and Soy Free - contains no sweetener at all

Verum Labs Grass Fed Whey Protein Isolate: Undenatured and Cold-Processed, 0g Fat, <1g Carbs, 5lb, Non-GMO, Gluten and Soy Free

(5) Now Foods Whey Protein, Isolate Pure, 10-Pound - contains no sweetener at all

Now Foods Whey Protein, Isolate Pure, 10-Pound

(6) Grass Fed Whey Protein Powder Isolate | Natural, Unflavored, Easy to Mix | Non GMO and Gluten Free | 1 Lb (454 Grams) - contains no sweetener at all

Grass Fed Whey Protein Powder Isolate | Natural, Unflavored, Easy to Mix | Non GMO and Gluten Free | 1 Lb (454 Grams)

(7) Antler Farms - 100% Pure, Clean, Grass Fed New Zealand Whey Protein Isolate, Organic Vanilla, 30 servings, 2 lbs - contains stevia

Antler Farms - 100% Pure, Clean, Grass Fed New Zealand Whey Protein Isolate, Organic Vanilla, 30 servings, 2 lbs

(8) Nature's Best Isopure Natural Whey Protein Isolate Powder Natural Chocolate -- 7.5 lbs - contains luo han guo and cane sugar

Nature's Best Isopure Natural Whey Protein Isolate Powder Natural Chocolate -- 7.5 lbs

 

(9) Integrated Supplements CFM Whey Protein Isolate 2 Lbs - contains luo han guo

Integrated Supplements CFM Whey Protein Isolate Diet Supplement, Dutch Chocolate, 2 Pound

(10) Alter Whey - Ultra-Pure Raw Grass-Fed Whey Protein Isolate - 1lb - contains no sweetener at all

Alter Whey - Ultra-Pure Raw Grass-Fed Whey Protein Isolate - 1lb

(11) Protein Factory Whey Isolate 5 lbs. Plain - contains no sweetener for plain and stevia for chocolate flavor

Protein Factory Whey Isolate 5 lbs. Plain

(12) Clean Label Whey Protein Isolate Powder, Unflavored, 2 Lbs., 37 Servings - contains no sweetener at all

Clean Label Whey Protein Isolate Powder, Unflavored, 2 Lbs., 37 Servings

(13) ALLMAX Nutrition Whey Protein Isolate Unflavored -- 5 lbs - contains no sweetener at all

ALLMAX Nutrition Whey Protein Isolate Unflavored -- 5 lbs

(14) Whey Protein Isolate Original Bluebonnet 2.2 Lbs Powder - contains no sweetener for original and stevia for flavored ones

Whey Protein Isolate Original Bluebonnet 2.2 Lbs Powder

(15) SDC Nutrition About Time Whey Protein Isolate, Chocolate, 2 Pound - contains stevia

SDC Nutrition About Time Whey Protein Isolate, Chocolate, 2 Pound

(16) Legion Whey+ Chocolate Protein Powder 5lb. Best Tasting All Natural Whey Isolate Protein Shake From Grass Fed Cows For Bodybuilding, Weight Loss & Faster Recovery - Low Carb, Lactose Free, Sugar Free - contains stevia

Legion Whey+ Chocolate Protein Powder 5lb. Best Tasting All Natural Whey Isolate Protein Shake From Grass Fed Cows For Bodybuilding, Weight Loss & Faster Recovery - Low Carb, Lactose Free, Sugar Free.

(17) LifeSource Vitamins 3.3 lb Grass Fed Whey Protein Isolate (Unflavored) - contains no sweetener at all

LifeSource Vitamins 3.3 lb Grass Fed Whey Protein Isolate (Unflavored)

(18) Xwerks Grow - New Zealand Grass Fed Whey Protein Powder Isolate (Vanilla Victory 2Lbs) - contains stevia

Xwerks Grow - New Zealand Grass Fed Whey Protein Powder Isolate (Vanilla Victory 2 Lbs)

(19) Whey Protein Powder Isolate by BulkSupplements (5 kilograms) | Clean & Pure Unflavored 90% Isolate for Men & Women | Build Muscle Mass & Burn Fat Fast - contains no sweetener at all

Whey Protein Powder Isolate by BulkSupplements (5 kilograms) | Clean & Pure Unflavored 90% Isolate for Men & Women | Build Muscle Mass & Burn Fat Fast

(20) Realist Lifestyle REAL Whey Protein Isolate, Ghost Flavor, Clean Ingredients, 2.45 Pounds, 50 Servings, Soy Free - contains no sweetener at all

Realist Lifestyle REAL Whey Protein Isolate, Ghost Flavor, Clean Ingredients, 2.45 Pounds, 50 Servings, Soy Free

(21) Jay Robb - Whey Protein Isolate Powder, Outrageously Delicious, Unflavored, 76 Servings (80 oz) - contains no sweetener for unflavored and stevia for flavored ones like chocolate, vanilla, strawberry, pina colada and tropical dreamsicle

Jay Robb - Whey Protein Isolate Powder, Outrageously Delicious, Unflavored, 76 Servings (80 oz)

(22) Glacier Nutrition Pure Vanilla Whey Protein Isolate Powder – 840 g – No Dairy, Gluten, Soy, or Preservatives - contains stevia

Glacier Nutrition Pure Vanilla Whey Protein Isolate Powder - 840 g - No Dairy, Gluten, Soy, or Preservatives

(23) BiPro 100% Whey Protein Isolate, 2lb., Unflavored, All Natural, Sugar-Free, Lactose-free, Gluten-free, 80 calories - contains no sweetener at all

BiPro 100% Whey Protein Isolate, 2lb., Unflavored, All Natural, Sugar-Free, Lactose-free, Gluten-free, 80 calories

(24) Vanilla Flavored Whey Isolate Protein Powder, 100% Lactose-Free Non-GMO Low Carb Whey Isolate with Stevia for Muscle Nutrition and Natural Weight Loss Now - contains stevia and monk fruit

Vanilla Flavored Whey Isolate Protein Powder, 100% Lactose-Free Non-GMO Low Carb Whey Isolate with Stevia for Muscle Nutrition and Natural Weight Loss Now

(25) Bodylogix Natural Isolate Protein Decadent Chocolate, 4 Pound - contains stevia

Bodylogix Natural Isolate Protein Decadent Chocolate, 4 Pound