
Sorry, this item is out of stock
NUFYX Organic Plant-Based Protein Powder, Dreamy Chocolate, 18g Protein, 100% USA Grown Peas, Digestive Support, 10 Servings $21.98
$2198current price $21.98NUFYX Organic Plant-Based Protein Powder, Dreamy Chocolate, 18g Protein, 100% USA Grown Peas, Digestive Support, 10 Servings
3174.7 out of 5 Stars. 317 reviewsSNAP EBT eligibleMyprotein Impact Whey Protein Powder, Vanilla Ice Cream, 22g Protein, 5.5lb $24.97
Options from$2497– $7499Myprotein Impact Whey Protein Powder, Vanilla Ice Cream, 22g Protein, 5.5lb
37554.5 out of 5 Stars. 3755 reviewsOptimum Nutrition Gold Standard 100% Casein Protein Powder, Vanilla, 24g Protein, 2 Lb $49.99
$4999current price $49.99Optimum Nutrition Gold Standard 100% Casein Protein Powder, Vanilla, 24g Protein, 2 Lb
1434.6 out of 5 Stars. 143 reviewsOptimum Nutrition ProQuench Clear Protein Powder, Strawberry Splash, 16 Servings $29.97
$2997current price $29.97Optimum Nutrition ProQuench Clear Protein Powder, Strawberry Splash, 16 Servings
183.8 out of 5 Stars. 18 reviewsSNAP EBT eligibleALOHA Plant Based Protein Powder, Vanilla, 18g Protein, 1LB 2.5oz $32.99
$3299current price $32.99ALOHA Plant Based Protein Powder, Vanilla, 18g Protein, 1LB 2.5oz
844.5 out of 5 Stars. 84 reviewsOptimum Nutrition Gold Standard 100% Whey Protein Powder, Double Rich Chocolate, 10 Servings $15.99
More options from$1449Optimum Nutrition Gold Standard 100% Whey Protein Powder, Double Rich Chocolate, 10 Servings
9484.6 out of 5 Stars. 948 reviewsSNAP EBT eligibleMyprotein Impact Whey Protein, Chocolate Milkshake, 20 Servings, 1.1 lbs $19.99
$1999current price $19.99Myprotein Impact Whey Protein, Chocolate Milkshake, 20 Servings, 1.1 lbs
63.8 out of 5 Stars. 6 reviewsNutricost Casein Protein Powder 2lb - Micellar Casein (Unflavored) $34.95
$3495current price $34.95Nutricost Casein Protein Powder 2lb - Micellar Casein (Unflavored)
244.6 out of 5 Stars. 24 reviewsNutricost Casein Protein Powder 2lb Vanilla - 100% Micellar Casein $34.95
$3495current price $34.95Nutricost Casein Protein Powder 2lb Vanilla - 100% Micellar Casein
674.4 out of 5 Stars. 67 reviewsRollback GNC Live Well Protein Powder, 25g Whey Protein, Creamy Vanilla, Gluten Free, No Sugar Added, 16 Servings $19.48 Was $21.97
$1948current price $19.48, Was $21.97$21.97GNC Live Well Protein Powder, 25g Whey Protein, Creamy Vanilla, Gluten Free, No Sugar Added, 16 Servings
2794.5 out of 5 Stars. 279 reviewsSNAP EBT eligiblePerformance Inspired Nutrition - Plant Protein Powder - Vegan - 20G - 1B Probiotics - Digestive Enzymes - G Free - Chocolate Delight - 1.5 lbs $31.99
$3199current price $31.99+$10.99 shippingPerformance Inspired Nutrition - Plant Protein Powder - Vegan - 20G - 1B Probiotics - Digestive Enzymes - G Free - Chocolate Delight - 1.5 lbs
674.2 out of 5 Stars. 67 reviewsBulkSupplements Casein Protein Powder - 30g per Serving - 1 Kilogram (2.2 lbs) - 33 Servings $34.97
More options from$1397BulkSupplements Casein Protein Powder - 30g per Serving - 1 Kilogram (2.2 lbs) - 33 Servings
424.5 out of 5 Stars. 42 reviewsNutricost Casein Protein Powder 5lb Vanilla - 100% Micellar Casein $66.95
$6695current price $66.95Nutricost Casein Protein Powder 5lb Vanilla - 100% Micellar Casein
614.6 out of 5 Stars. 61 reviewsNutricost Casein Protein Powder 2lb Chocolate - 100% Micellar Casein $34.95 Was $38.97
$3495current price $34.95, Was $38.97$38.97Nutricost Casein Protein Powder 2lb Chocolate - 100% Micellar Casein
464.2 out of 5 Stars. 46 reviewsMyprotein Clear Whey Isolate Protein Powder, Tropical Dragonfruit, 20 Servings, Muscle Builder $24.97 $1.42/oz
$2497current price $24.97$1.42/ozMyprotein Clear Whey Isolate Protein Powder, Tropical Dragonfruit, 20 Servings, Muscle Builder
6264.5 out of 5 Stars. 626 reviewsSNAP EBT eligibleRollback Premier Protein Shake, Chocolate, 30g Protein, 11 Fl Oz, 12 Ct $23.97 Was $26.74
More options from$958$26.74Premier Protein Shake, Chocolate, 30g Protein, 11 Fl Oz, 12 Ct
1443174.6 out of 5 Stars. 144317 reviewsSNAP EBT eligibleGarden of Life Organic Plant Based Greens Probiotic 20g Protein Shake Drink Powder for Digestive Gut Health, Vegan, Chocolate, 18 Servings $18.97 97.8 ¢/oz
$1897current price $18.9797.8 ¢/ozGarden of Life Organic Plant Based Greens Probiotic 20g Protein Shake Drink Powder for Digestive Gut Health, Vegan, Chocolate, 18 Servings
4584.3 out of 5 Stars. 458 reviewsSNAP EBT eligibleOptimum Nutrition Gold Standard 100% Whey Protein Powder, Cinnamon Roll, 1.5 lb Tub, 22 Servings $27.99
$2799current price $27.99Optimum Nutrition Gold Standard 100% Whey Protein Powder, Cinnamon Roll, 1.5 lb Tub, 22 Servings
7984.8 out of 5 Stars. 798 reviewsSNAP EBT eligible


Six Star Casein Protein Powder Plus, 24g Protein, Triple Chocolate, 2 lbs, 23 Servings
Key item features
- 100% high-quality casein protein, a form of protein that has a slow absorption rate into the bloodstream
- Each scoop serves up 24g of protein and 4.9g of BCAAs – leucine, isoleucine and valine – to fuel you up, day in and day out
- This sustained delivery ensures a continued flow of amino acids to your muscles
- Core ingredients scientifically superior to regular whey protein, test subjects built 4X the muscle and 2X the strength
- Engineered for active men & women, strength trainers, all athletes, fitness enthusiasts, body builders and endurance athletes
- Gluten free with 26 Servings
Specs
- Total protein per serving24g
- FlavorChocolate
- Sugar per serv1g
- Cal per serv140cal
- Ingredient preferenceGluten-Free, Steroid-Free
- Vitamin & supplement typeProtein Supplements
Reviews summary
- : Has a deep, chocolate flavor profile.
- : Offers great value at this cost.
- : Mixes easily and consistently in liquids.
- : Provides muscle recovery and growth support during sleep.
How do you want your item?
About this item
Product details
- 100% high-quality casein protein, a form of protein that has a slow absorption rate into the bloodstream
- Each scoop serves up 24g of protein and 4.9g of BCAAs – leucine, isoleucine and valine – to fuel you up, day in and day out
- This sustained delivery ensures a continued flow of amino acids to your muscles
- Core ingredients scientifically superior to regular whey protein, test subjects built 4X the muscle and 2X the strength
- Engineered for active men & women, strength trainers, all athletes, fitness enthusiasts, body builders and endurance athletes
- Gluten free with 26 Servings
Specifications
Total protein per serving
Brand
Flavor
Sugar per serv
Indications
Stop Use Indications
Health Concern
Directions
Dosage
Instructions
Warranty
Warranty information
Ingredients
Ingredients
Casein protein blend (milk protein isolate [supplying micellar casein and whey], micellar casein), maltodextrin, cocoa powder (processed with alkali), salt, natural and artificial flavors, gum blend (cellulose gum, xanthan gum, carrageenan), acesulfame potassium, sucralose, soy or sunflower lecithin.Contains milk and soy ingredients. Processed in a facility that also processes wheat, tree nut and egg ingredients.Six Star Casein Protein is manufactured according to cGMP standards, as is required for all dietary supplements.
Warnings
Popular items in this category
Best selling items that customers love
Muscle Milk Pro Series Protein Powder Supplement, Knockout Chocolate, 2 Pound, 11 Servings, 50g Protein $27.97
Sponsored$2797current price $27.97Muscle Milk Pro Series Protein Powder Supplement, Knockout Chocolate, 2 Pound, 11 Servings, 50g Protein
7064.5 out of 5 Stars. 706 reviewsSave withPickup todayDelivery todayShipping, arrives tomorrow100+ bought since yesterday Six Star Pro Nutrition 100% Whey Protein Powder Plus, 30g Protein, Triple Chocolate, 1.81 lbs $19.76
100+ bought since yesterday
7 optionsAvailable in additional 7 options$1976current price $19.76Options from $19.76 – $38.27Six Star Pro Nutrition 100% Whey Protein Powder Plus, 30g Protein, Triple Chocolate, 1.81 lbs
67844.5 out of 5 Stars. 6784 reviewsSave withPickup todayDelivery todayShipping, arrives tomorrowSNAP EBT eligibleMuscletech Grass-Fed 100% Whey Protein Powder, Triple Chocolate, 20g Protein, 1.8 lbs, 23 Servings $40.85 $1.42/oz
$4085current price $40.85$1.42/ozMuscletech Grass-Fed 100% Whey Protein Powder, Triple Chocolate, 20g Protein, 1.8 lbs, 23 Servings
1084.5 out of 5 Stars. 108 reviewsShipping, arrives in 3+ daysBSN Syntha 6 Whey Protein Powder, Chocolate, 2.91lb $37.19 Was $41.99
Now$3719current price Now $37.19, Was $41.99$41.99You save $4.80You save$4.80BSN Syntha 6 Whey Protein Powder, Chocolate, 2.91lb
4754.6 out of 5 Stars. 475 reviewsSave withShipping, arrives tomorrowTruvani Vegan Plant Based Pea Protein Powder | Organic | Chocolate | 20 Servings | Gluten & Dairy Free $50.74
2 optionsAvailable in additional 2 options$5074current price $50.74Truvani Vegan Plant Based Pea Protein Powder | Organic | Chocolate | 20 Servings | Gluten & Dairy Free
594.4 out of 5 Stars. 59 reviewsShipping, arrives in 3+ daysNaturalSlim Metabolic Protein C-Plus - Whey Protein Shake Powder Chocolate, 10 Servings $35.95
3 optionsAvailable in additional 3 options$3595current price $35.95+$9.32 shippingNaturalSlim Metabolic Protein C-Plus - Whey Protein Shake Powder Chocolate, 10 Servings
64.5 out of 5 Stars. 6 reviewsShipping, arrives in 3+ daysPure Protein 100% Whey Protein Powder, Rich Chocolate, 25g Protein, 1.75 lb $18.61 Was $22.98 66.5 ¢/oz
Now$1861current price Now $18.61, Was $22.98$22.9866.5 ¢/ozYou save $4.37You save$4.37Pure Protein 100% Whey Protein Powder, Rich Chocolate, 25g Protein, 1.75 lb
3264.5 out of 5 Stars. 326 reviewsSave withShipping, arrives tomorrowIsopure, Low Carb 100% Whey Protein Isolate, 25 g Protein Powder, Chocolate, 1 lb, 14 Servings $33.81
2 optionsAvailable in additional 2 options$3381current price $33.81Options from $33.81 – $109.99Isopure, Low Carb 100% Whey Protein Isolate, 25 g Protein Powder, Chocolate, 1 lb, 14 Servings
4574.4 out of 5 Stars. 457 reviewsShipping, arrives in 3+ daysMuscleTech NitroTech Whey Protein Powder, Milk Chocolate $37.43
4 optionsAvailable in additional 4 options$3743current price $37.43Options from $37.43 – $74.86MuscleTech NitroTech Whey Protein Powder, Milk Chocolate
3084.6 out of 5 Stars. 308 reviewsSave withShipping, arrives tomorrowAllMax Nutrition - AllWhey Gold Premium Isolate/Whey Protein Blend Chocolate - 2 lbs. $44.71
$4471current price $44.71AllMax Nutrition - AllWhey Gold Premium Isolate/Whey Protein Blend Chocolate - 2 lbs.
4604.7 out of 5 Stars. 460 reviewsShipping, arrives in 3+ daysGNC Pro Performance 100% Whey Protein Powder, Chocolate Supreme, 25g Protein, 12 Servings $15.45 44.4 ¢/oz
$1545current price $15.4544.4 ¢/ozGNC Pro Performance 100% Whey Protein Powder, Chocolate Supreme, 25g Protein, 12 Servings
183.8 out of 5 Stars. 18 reviewsSave withShipping, arrives tomorrowSNAP EBT eligibleMusclepharm Combat 100% Whey Protein Powder, Chocolate, 25g Protein, 5 Lb $84.99 $15.18/lb
$8499current price $84.99$15.18/lbMusclepharm Combat 100% Whey Protein Powder, Chocolate, 25g Protein, 5 Lb
7114.6 out of 5 Stars. 711 reviewsShipping, arrives in 3+ daysPure Protein 100% Whey Protein Powder, Rich Chocolate, 25g Protein, 1 Lb $23.91
$2391current price $23.91Pure Protein 100% Whey Protein Powder, Rich Chocolate, 25g Protein, 1 Lb
394.6 out of 5 Stars. 39 reviewsSave withShipping, arrives tomorrowPlantFusion Complete Protein Powder, Rich Chocolate, 2 lb (900 g) Powder $55.10 $1.72/oz
$5510current price $55.10$1.72/ozPlantFusion Complete Protein Powder, Rich Chocolate, 2 lb (900 g) Powder
8404.5 out of 5 Stars. 840 reviewsShipping, arrives in 3+ daysNOW Sports Nutrition, Whey Protein Isolate, 25 G With BCAAs, Creamy Chocolate Powder, 5-Pound $80.99 0.0 ¢/lb
$8099current price $80.990.0 ¢/lbNOW Sports Nutrition, Whey Protein Isolate, 25 G With BCAAs, Creamy Chocolate Powder, 5-Pound
6824.4 out of 5 Stars. 682 reviewsShipping, arrives in 3+ daysDymatize Super Mass Gainer, Rich Chocolate, 6 lbs $56.99
5 optionsAvailable in additional 5 options$5699current price $56.99More options from $44.98Dymatize Super Mass Gainer, Rich Chocolate, 6 lbs
9804.5 out of 5 Stars. 980 reviewsShipping, arrives in 3+ daysMuscle Milk Zero Protein Powder, Chocolate, 1.65 Pound, 25 Servings, 15g Protein $24.07 91.2 ¢/oz
$2407current price $24.0791.2 ¢/ozMuscle Milk Zero Protein Powder, Chocolate, 1.65 Pound, 25 Servings, 15g Protein
284.4 out of 5 Stars. 28 reviewsSave withShipping, arrives tomorrowSNAP EBT eligibleMusclePharm Combat Protein Powder, Chocolate Milk, 25g Protein, 4lb, 64oz $69.99 $16.47/lb
$6999current price $69.99$16.47/lbMusclePharm Combat Protein Powder, Chocolate Milk, 25g Protein, 4lb, 64oz
6784.6 out of 5 Stars. 678 reviewsShipping, arrives in 3+ days
More items to consider
Based on what customers bought
100+ bought since yesterday Orgain Hydrolyzed Grass Fed 20g Collagen Peptides Powder, Unflavored, 1lb $23.88
100+ bought since yesterday
2 optionsAvailable in additional 2 optionsSponsored$2388current price $23.88Orgain Hydrolyzed Grass Fed 20g Collagen Peptides Powder, Unflavored, 1lb
40924.5 out of 5 Stars. 4092 reviewsSave withPickup todayDelivery todayShipping, arrives tomorrow100+ bought since yesterday Six Star Pro Nutrition Creatine Caplets, 60 Ct $11.97
100+ bought since yesterday
2 optionsAvailable in additional 2 optionsSponsored$1197current price $11.97Six Star Pro Nutrition Creatine Caplets, 60 Ct
6924.5 out of 5 Stars. 692 reviewsSave withPickup todayDelivery todayShipping, arrives tomorrowC4 Sport Pre-Workout Powder, Blue Raspberry Flavor, 30 Servings $19.99 Was $24.00 $2.67/oz
Now$1999current price Now $19.99, Was $24.00$24.00$2.67/ozYou save $4.01You save$4.01C4 Sport Pre-Workout Powder, Blue Raspberry Flavor, 30 Servings
1864.5 out of 5 Stars. 186 reviewsSave withShipping, arrives tomorrowC4 Sport Ripped Pre Workout Powder, Arctic Snow Cone, 30 Servings $24.99
4 optionsAvailable in additional 4 options$2499current price $24.99Options from $24.99 – $25.49C4 Sport Ripped Pre Workout Powder, Arctic Snow Cone, 30 Servings
4424.4 out of 5 Stars. 442 reviewsSave withShipping, arrives tomorrowProSupps Mr. Hyde Signature Pre-Workout Powder Fruit Punch 14.7 oz $15.78 Was $19.98 $2.08/oz
Now$1578current price Now $15.78, Was $19.98$19.98$2.08/ozYou save $4.20You save$4.20ProSupps Mr. Hyde Signature Pre-Workout Powder Fruit Punch 14.7 oz
2044.4 out of 5 Stars. 204 reviewsSave withShipping, arrives tomorrow100+ bought since yesterday ProSupps Mr. Hyde Signature Pre-Workout Powder Blue Razz 14.7 oz $15.78 Was $19.98 $1.53/oz
100+ bought since yesterday
Now$1578current price Now $15.78, Was $19.98$19.98$1.53/ozYou save $4.20You save$4.20ProSupps Mr. Hyde Signature Pre-Workout Powder Blue Razz 14.7 oz
4644.2 out of 5 Stars. 464 reviewsSave withPickup todayDelivery todayShipping, arrives tomorrowBest seller Six Star Pro Nutrition Creatine X3 BCAA Amino Acid Blend Powder, Fruit Punch, 2.18 lbs, 30 Servings $24.97
Best seller
2 optionsAvailable in additional 2 optionsSponsored$2497current price $24.97Six Star Pro Nutrition Creatine X3 BCAA Amino Acid Blend Powder, Fruit Punch, 2.18 lbs, 30 Servings
6254.5 out of 5 Stars. 625 reviewsSave withPickup todayDelivery todayShipping, arrives tomorrowBest seller Country Farms Super Greens Drink Mix, Unflavored, 10.6 oz, 20 Servings $17.99 Was $19.99 $1.70/oz
Best seller
Now$1799current price Now $17.99, Was $19.99$19.99$1.70/ozYou save $2.00You save$2.00Country Farms Super Greens Drink Mix, Unflavored, 10.6 oz, 20 Servings
5774.5 out of 5 Stars. 577 reviewsSave withShipping, arrives tomorrowSix Star Pro Nutrition PreWorkout L Arginine Nitric Oxide Amino Acid Supplement, 60 Ct $16.97
2 optionsAvailable in additional 2 options$1697current price $16.97Six Star Pro Nutrition PreWorkout L Arginine Nitric Oxide Amino Acid Supplement, 60 Ct
2994.3 out of 5 Stars. 299 reviewsShipping, arrives in 3+ days100+ bought since yesterday Six Star Testosterone Booster Caplets, 386 mg Rhodiola Extract, 60 Ct, 30 Servings $10.14 Was $13.20
100+ bought since yesterday
3 optionsAvailable in additional 3 optionsNow$1014current price Now $10.14, Was $13.20$13.20You save $3.06You save$3.06Six Star Testosterone Booster Caplets, 386 mg Rhodiola Extract, 60 Ct, 30 Servings
12134.3 out of 5 Stars. 1213 reviewsSave withPickup todayDelivery todayShipping, arrives tomorrowBest seller Amazing Grass, Super Greens Powder, Original, 30 Servings $21.24 Was $29.99
Best seller
5 optionsAvailable in additional 5 optionsNow$2124current price Now $21.24, Was $29.99$29.99You save $8.75You save$8.75More options from $20.00Amazing Grass, Super Greens Powder, Original, 30 Servings
30364.5 out of 5 Stars. 3036 reviewsSave withShipping, arrives tomorrowRollback Optimum Nutrition Essential Amino Energy Powder Plus Hydration, Tangerine Wave, with BCAA, Electrolytes, and Caffeine, 30 Servings $21.24
Rollback
6 optionsAvailable in additional 6 options$2124current price $21.24More options from $19.97Optimum Nutrition Essential Amino Energy Powder Plus Hydration, Tangerine Wave, with BCAA, Electrolytes, and Caffeine, 30 Servings
19454.5 out of 5 Stars. 1945 reviewsSave withShipping, arrives tomorrowRollback Optimum Nutrition Essential Amino Energy Hydration Plus Focus Powder, Watermelon Splash, 30 Servings $19.97 Was $24.97
Rollback
6 optionsAvailable in additional 6 optionsNow$1997current price Now $19.97, Was $24.97$24.97You save $5.00You save$5.00Options from $19.97 – $22.79Optimum Nutrition Essential Amino Energy Hydration Plus Focus Powder, Watermelon Splash, 30 Servings
19454.5 out of 5 Stars. 1945 reviewsSave withPickup todayDelivery todayShipping, arrives tomorrowMuscleTech Men's AlphaTest Maximum Strength Testosterone Booster for Muscle Growth, Unflavored, 120 Count $18.23
2 optionsAvailable in additional 2 options$1823current price $18.23MuscleTech Men's AlphaTest Maximum Strength Testosterone Booster for Muscle Growth, Unflavored, 120 Count
4924.4 out of 5 Stars. 492 reviewsSave withPickup todayDelivery todayShipping, arrives tomorrowC4 Sport Pre Workout Powder, Fruit Punch, 30 Servings $22.92
2 optionsAvailable in additional 2 options$2292current price $22.92More options from $19.99C4 Sport Pre Workout Powder, Fruit Punch, 30 Servings
2184.6 out of 5 Stars. 218 reviewsSave withShipping, arrives tomorrowOptimum Nutrition BCAA 1000 Capsules, 60 Ct $9.74 Was $10.99
Now$974current price Now $9.74, Was $10.99$10.99You save $1.25You save$1.25Optimum Nutrition BCAA 1000 Capsules, 60 Ct
494.6 out of 5 Stars. 49 reviewsShipping, arrives in 3+ daysBest seller Amazing Grass Antioxidant Green Superfood Powder, Sweet Berry, 30 Servings $24.99
Best seller
5 optionsAvailable in additional 5 options$2499current price $24.99More options from $20.00Amazing Grass Antioxidant Green Superfood Powder, Sweet Berry, 30 Servings
30364.5 out of 5 Stars. 3036 reviewsSave withShipping, arrives tomorrowQuest Protein Bar, Birthday Cake Flavored, Gluten Free, 20g of Protein, 4 Count $17.36
4 optionsAvailable in additional 4 options$1736current price $17.36Options from $17.36 – $44.40Quest Protein Bar, Birthday Cake Flavored, Gluten Free, 20g of Protein, 4 Count
6264.3 out of 5 Stars. 626 reviewsShipping, arrives in 3+ daysC4 Sport Pre-Workout Powder, Watermelon, 30 Servings $19.99
2 optionsAvailable in additional 2 options$1999current price $19.99Options from $19.99 – $22.92C4 Sport Pre-Workout Powder, Watermelon, 30 Servings
2184.6 out of 5 Stars. 218 reviewsSave withShipping, arrives tomorrowCountry Farms Super Reds Drink Mix, Berry, 7.1 oz., 20 servings $16.99
Sponsored$1699current price $16.99Country Farms Super Reds Drink Mix, Berry, 7.1 oz., 20 servings
1654.4 out of 5 Stars. 165 reviewsSave withShipping, arrives tomorrow
Customer ratings & reviews
Reviews summary
- : Has a deep, chocolate flavor profile.
- : Offers great value at this cost.
- : Mixes easily and consistently in liquids.
- : Provides muscle recovery and growth support during sleep.
Customer images






+55 images
Showing 1-3 of 163 reviews
Verified Purchase
Great way to add slow digesting protein
At age 66 I am still an athlete. I spread my intake of protein out over a 24 hour period. Casein is a great way to intake protein that digests slowly to keep it in the system more steadily. You have to use it in conjunction with other protein intakes, It doesn't replace food! But, it adds nicely and I use it in my coffee too!
Verified Purchase
great taste and definitely repairs muscle quickly over night.
Verified Purchase
Good Product - Tastes Great
I like this product, too. It blends easily and tastes great. I've switched to casein from whey for my night-time routine, and can't really tell if that makes much difference (COVID has pretty well turned my routines upside-down, so it's hard to tell what is going on), but it definitely isn't hurting anything. And it's not very expensive, so it'll probably be part of my routine into the future.
