RSP Nutrition


26g of Whey Isolate + BCAAs, Glutamine, L-Carnitine, Betaine & Digestive Enzymes
Whey Isolate Recovery Formula
9.5  out of 10  (175 Reviews)
1 Size
20 Servings
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2 Flavors
Lemon Lime Sherbet
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Price: $34.97  ($1.75 / Serving)
Flavor Rating: 9.1

Product Overview

Whey Protein Isolate
Naturally Occurring BCAAs
Betaine Anhydrous

Formulated to Support
4 Key Factors

Increase Lean Muscle Growth*

Increase Strength and Power*

Maximize Protein Synthesis*

Reduce Muscle Soreness*

The Science

isoPost is formulated to be the ideal post workout anabolic protein for optimizing your post-workout recovery. Created using only the finest, research backed ingredients, IsoPost delivers just what you need to capitalize on your post-workout nutrition and help you build muscle, reduce muscle breakdown, improve overall anabolism and jumpstart optimal recovery.*

26g Whey Protein Isolate
  • The purest protein available; Easy to digest & quickly absorbed*
  • Highest leucine content of any known protein*
  • Delivers all 9 essential amino acids*
  • Supports lean muscle growth, strength & recovery*
3g Glutamine
  • Replenishes the body's glutamine levels*
  • A conditional amino acid.*
2g L-Carnitine Tartrate
  • Reduces muscle damage from training*
  • Shown to reduce skeletal muscle lactate during training*
2.5g Betaine Anhydrous
  • Shown to increase muscle strength*
  • Shown to increase power*
500mg L-Orinthine AKG
  • Supports nitrogen disposal*
150mg Digestive Enzymes
  • Enhances protein absorption*
  • Supports overall digestive function*


RSP TrueFit
Leading Whey Isolate

100% Whey Protein Isolate






L-Carnitine-L-Tartrate for Reducing Muscle Damage*



Betaine Anhydrous for Increasing Strength and Power*



Ornitine AKG



Free of Artificial Colors



TeamRSP. Join The Movement. Live Inspired. Live RSP.

Ratings & Reviews

Overall Rating
175 Ratings
Verified Buyer Rating
39 Ratings
Average Flavor Rating
2 Flavors
Top Rated Flavor
Strawberry Kiwi
By clicking the button above, you agree to entering the Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
Oct 31, 2018
Verified Buyer
  • 9 Lemon Lime Sherbet

Love this stuff. Just bought 2 more containers. Found out RSP is discontinuing this product. Sucks.

Oct 08, 2018
  • 10 Lemon Lime Sherbet

This product contains all of one needs for post workout. All of ingredients help for fast recovery and improve muscle growth. This is second tub I ordered and both flavors are awesome.

Sep 29, 2018
  • 8 Lemon Lime Sherbet

ISOPOST is great for post workout, goes down smooth and taste great.

Sep 14, 2018
Verified Buyer
  • 5 Lemon Lime Sherbet

Excellent immediately following a workout. Strawberry kiwi tastes excellent but when out of stock, the lemon lime is not great...however, same results.

Sep 07, 2018

I am on my second container and continue to be extremely happy with this product. It will be a staple for me.

Jul 08, 2018
  • 10 Lemon Lime Sherbet

Its the best of best

Jun 24, 2018
Verified Buyer

Everything perfect; poor mixability !!

Jun 15, 2018

This product is seriously awesome!! Taste great and has helped my recovery after workouts as well as improved overall strength and growth expectations. It does get a bit fizzy after you shake but not really a concern with me. I completely recommend adding this supplement into your aresenal.

Jun 15, 2018

Isopost is a great whey isolate protein with some extra goodies added. The glutamine is probably my favorite addition, prevents having to buy additional products.

Jun 08, 2018
Verified Buyer

Dont taste bad, good quality ingredients but by far is the worst mixing protein I've ever had better use a blender for this stuff or enjoy drinking thick chunks of goo

May 30, 2018
  • 8 Lemon Lime Sherbet

I had a chance to try both the flavors of this pre-workouts and I preferred the strawberry kiwi over the lemon lime sherbet but they were still both pretty good protein.

May 26, 2018

Wow, finally a protein powder in a cool flavor! I get so bored of drinking chocolate or vanilla. I actually look forward to drinking my ISOPOST.

May 22, 2018
  • 7 Lemon Lime Sherbet

This stuff is a really good product for that post workout recovery. It goes well with water or milk and supplies a lot of things the body needs for recovery. RSP has a lot of good products and this is one of the best.

May 09, 2018

This was my first time using the Isopost and I was thoroughly impressed with it! I have used Cellucor brand and BPI in the past and the flavor of the strawberry kiwi Isopost far exceeded both brands. I really how well it mixed eve without a blender. I could even add it into my fruit and veggie smoothie packs and would use it as on the go meals as well as post workout fuel. I would definitely highly recommend this product to anyone that's serious about taking their training to the next level and wanting to get the full benefits of their workouts! I'll definitely be buying another fun once I get low on this one!

May 04, 2018
Verified Buyer

I'm on my 4th container of IsoPost and I have to say it makes a huge difference in my results and overall health! I work out 5-6 days a week and rarely feel sore when I'm taking it. I've also noticed lean muscle gains over the 4 month period that I have been taking it. Has an amazing ingredient profile and the Strawberry Kiwi tastes amazing! Iso-post will continue to be a staple in my supplement cabinet!

20 Servings
20 Servings
$1.75 Per Serving

What's in RSP Nutrition IsoPost

Serving Size: One Scoop (40.5 g)
Servings Per Container: 20
Amount Per Serving %DV *
Calories 120       
Calories From Fat 14       
Total Fat 1.5 g 2%*
Saturated Fat 1 g 5%*
Cholesterol 5 mg 2%
Total Carbohydrates 1 g 0%*
Sugar 1 g
Includes 0g Added Sugars 0%
Protein 26 g 52%
Calcium 110 mg 10%
Sodium 70 mg 3%
Potassium 140 mg 4%
L-Glutamine 3,000mg
Betaine Anhydrous 2,500mg
L-Carnitine L-Tartrate 2,000mg
Ornithine Alpha-Ketoglutarate 500mg
Digestive Enzyme Blend 150mg
(Amylase, Protease, Lipase, Lactase, Cellulase)
* Percent Daily Values are based on a 2,000 calorie diet.
† Daily Value not established.
Other Ingredients:
Whey Protein Isolate, Medium Chain Triglycerides, Natural and Artificial Flavors, Natural Color, Citric Acid, Acesulfame Potassium, Sucralose, Malic Acid, Gum Blend (Cellulose Gum, Xanthan Gum, Carrageenan).
Allergen Warning: Manufactured on equipment which processes products containing milk, eggs, soybeans, wheat, shellfish, fish oil, tree nuts, and peanut flavor.

Directions For IsoPost: As a dietary supplement, mix one scoop in 8-12 ounces of cold water and shake vigorously. For maximum results, take one serving immediately post workout. For non-training days, consume one serving mid-day between meals.

Warnings: If you have any health conditions, are pregnant, breast feeding or taking medication, ask a physician before use. Keep out of use of small children. This product contains a chemical known to the state of California to cause birth defects, or other reproductive harm.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.