RSP Nutrition


26g of Whey Isolate + BCAAs, Glutamine, L-Carnitine, Betaine & Digestive Enzymes
Whey Isolate Recovery Formula
9.7 out of 10 (167 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
167 Ratings
Verified Buyer Rating
36 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.
Verified Buyer
  • 10 Strawberry Kiwi

All essential ingredients. Thumbs up

  • 10 Strawberry Kiwi

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.

  • 10 Strawberry Kiwi
  • 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.

  • 9 Strawberry Kiwi

This is one of the protein stacks that I use in my regular routine. It does the job for me and would recommend this protein.

  • 10 Strawberry Kiwi

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!

Verified Buyer
  • 10 Strawberry Kiwi

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!

  • 8 Strawberry Kiwi

Great product! Perfect for right after a workout. The rating would have been even higher but it's a little tough to mix.

  • 9 Strawberry Kiwi

I highly recommend this product! I take it immediately after my workout and it digests fast. I never feel bloated like other whey proteins. It mixes well and tastes great!

Verified Buyer
  • 9 Strawberry Kiwi

I love this protein! Wanted something other than vanilla/chocolate/coffee flavored proteins because mixing with milk makes me feel too full. Mixing this protein with water tastes great and I can drink it during or after a workout without being nauseous. Flavor is good, mixability is good, I’d recommend to anyone looking for a good whey protein!

Verified Buyer
  • 8 Lemon Lime Sherbet

I really enjoyed the flavor because it isn't your typical heavy, dessert like protein. Lemon lime Sherbert tastes exactly like sherbet (if it was melted). I really enjoy the added glutamine and carnitine, essential ingredients in my opinion. Definitely helps with my DOMS. I have not used it too long, but from my experience, it is a great overall product

  • 10 Strawberry Kiwi

IsoPost has really helped me with recovery from some hard training sessions. My muscle soreness was cut in half. The ingredient profile is solid and clearly listed on the label. I had the Strawberry Kiwi and it tasted great! It does take some extra time to mix it up. I put in a shaker to mix it and usually just add some more water to it if there is any left at the bottom. A little extra hydration never hurt anyone. I will definitely purchase IsoPost again and try out the Lemon Lime flavor.

  • 3 Strawberry Kiwi

Based on the reviews I received this product and proceeded to try it. Unfortunately, it’s a bad experience to report. First, after mixing w ten ounces of water I experienced a clumping nightmare. I literally had to shake it for dear life for a solid 60-90 seconds and the clumping was insane. Not tiny clumps, massive ones which suggest a formulation problem. The last thing I want to do after an intense upper body workout is to endure this. Second, the amount of foam was severe which caused me to have a pretty nasty case of bloating. Again, not a normal foam, we’re talking ten ounces of water, 1 scoop of product, and the rest of my 32 ounce shaker was filled w thick foam. Based on the reviews, I am guessing I received a bad batch. I was really looking forward to using it because of the positivity that surrounded it. I gave it 3 stars simply because the label is good in terms of how the product is packed nutritionally. I really hate this happened to me.

  • 10 Strawberry Kiwi
  • 10 Lemon Lime Sherbet

RSP sent me a free batch of Isopost. Both flavors taste great, I love the ingredients, and I feel fulfilled drinking this post workout. I really wanted to rate this a 10, but it just doesn’t mix well enough for me, leaving clunks of powder every time.

  • 10 Strawberry Kiwi

One of the best post workout protein I’ve tried, I was skeptical at first cause the flavor sounds like a weird mix but it’s very good, it’s high quality protein only back draw is that you need to shake very well cause it stays a little clumpy, but it’s all worth it since I’ve noticed that my recovery time is much faster when I drink it

  • 10 Strawberry Kiwi
  • 7 Lemon Lime Sherbet

Over all it’s a very good probduct! One thing i would say is the powder is smell is not that good but th taste is delicious! Also I gave it an 8 overall because doesn’t mix to well, mine had so clumps after mixure and it get the bubbly after shaking it and takes a while to go back to liquid form.

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.