Essential AmiN.O. Energy
Optimum Nutrition

Essential AmiN.O. Energy

Amino Acid Powder with Caffeine from Natural Sources!
Designed to Support Muscle Endurance and Recovery*
8.9 out of 10 (2,630 Reviews)
5 Sizes
25 Servings - Natural
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4 Flavors
Naturally Flavored Simply Fruit Punch
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Price: $19.99 ($0.80 / Serving)
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Buy 1 Get 1 50% Off
For a limited time, buy 1 Essential AmiN.O. Energy, 25 Servings - Natural & get 1 50% Off!
Limited Time Offer
For a limited time, buy 1 Zero Carb Isopure, 3 Lbs. & get Essential AmiN.O. Energy, 30 Servings 50% Off!

Product Overview

Optimum Nutrition. Anytime Energy and Amino Acid Support
Optimum Nutrition Essential Amino Energy


  • Choose from:
    12 Fruit Flavors
    3 Cafè Series Flavors
    4 Naturally Flavored Options
  • All with 100 MG Caffeine from Natural Sources & 5 G Micronized Free Form Amino Acids
  • Consistently One of’s Top Products
  • Made in ON Operated Facilities that are GMP Registered and GMP for Sport by NSF
Optimum Nutrition Isolate
Amino Energy at a glance. What: Caffeine and Amino Acids. When: Anytime, for any occasion. Why: High Quality Food Supplement.
Concord Grape Blue Raspberry Fruit Punch Green Apple Lemon Lime Orange Cooler Strawberry Lime Watermelon Blueberry Mojito Flavor Pineapple Peach Lemonade Peach Lemonade


Iced Cafe Vanilla Iced Chai Tea Iced Mocha Cappuccino


Iced Mocha Cappuccino Iced Mocha Cappuccino Iced Mocha Cappuccino Iced Mocha Cappuccino


Half & Half Lemonade & Iced Tea Sweet Mint Tea White Peach Tea Raspberry Black Tea
ON Essential Amino Energy bottle image
ON Essential Amino Energy bottle image


  • Sweetened With Stevia Leaf Extract
  • Colored with Fruit and Vegetable Extract


  • Made with Real Colombian Coffee
  • Great Mixed Intro Cold Along Milk
Optimum Nutrition essential Amino bottles

True Strength is a journey. It never rests, it never quits. It's about overcoming obstacles, accomplishing goals, and recognizing achievements. And then it resets to achieve again. As your trusted sports nutrition partner in goal achievement, ON demonstrates that same passion while crafting our products. From the raw materials we source to our state-of-the-art manufacturing processes, no compromises are made. You set the bar higher after every workout, we set the bar higher to redefine the industry standards and ensure you realize optimum results.


There are times when you want a hefty dose of caffeine for pre-workout performance. But on other occasions, like first thing in the morning or a late afternoon pick-me-up, what you’d get from a cup of coffee is more appropriate. ON’s Essential Amino Energy™ offers the best of both with a formula that delivers 100mg of caffeine from natural sources per 2-scoop serving. Decrease or increase the energy level as the occasion demands. Each serving provides 5 grams of micronized amino acids.

Optimum Nutrition Essential Amino Energy

Optimum Nutrition has been spotting the efforts of goal driven individuals since 1986. As one of the few companies to operate state-of-the-art manufacturing facilities that are GMP compliant, ON assures that every shake will mix up effortlessly because of its first-to-market instantization process. You also expect each shake to taste the same as the last and your next. That's the kind of consistency ON delivers.


Optimum Nutrition is legendary for both quality and innovation. In addition to producing the world's best-selling whey protein, ON's Gold Standard 100% Casein™ introduced slow-digesting nighttime protein to the weight training world and Essential Amino Energy™ created the anytime energy category in sports nutrition. When technology makes advancements possible, ON will be the company bringing it first to your shaker cup.

Ratings & Reviews

Overall Rating
2,630 Ratings
Verified Buyer Rating
1,441 Ratings
Average Flavor Rating
30 Flavors
Top Rated Flavor
Lime Mint Mojito
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 Iced Cafe Vanilla
  • 10 Sweet Mint Tea
Verified Buyer
  • 9 Concord Grape
  • 8 Blue Raspberry
  • 7 Lemon Lime
  • 3 Iced Mocha Cappuccino
  • 10 Fruit Fusion
  • 9 Watermelon
  • 10 Blueberry Mojito
  • 9 Juicy Strawberry Burst
  • 10 Orange Cooler

Hey everyone! I’ve tried different Amino energy products such as: “Amino Lean,” “EVL,”& “BPI.” Of all these I think this product is the best. It gives you a good amount of energy to get through a workout or a long work day, but not overkill to the point where you’re itchy & giddy. I am a huge fan of this product because it works & the taste is great. I do not recommend the café series. I’ve tried mixing it with cold/hot water, cold/hot milk, and even a blend of water & milk, but the taste was unbearable. Aside from the café series, any other flavor is perfect, if not, at least drinkable. There is also another flavor called “blueberry lemonade” sold at Costco, which is so good 10/10. As you guys can see I’ve tried a lot of flavors. Why? Because it tastes so **** good. Honestly, I think some flavor reviews are a bit harsh, but everyone has their own flavor profile.

Verified Buyer
  • 10 Concord Grape
  • 10 Watermelon
  • 9 Orange Cooler
  • 10 Juicy Strawberry Burst

When I ordered this back in September, I was just getting back into working out again, so I tried this to give me an early morning kick, keep me motivated on days where I drag. I did a lot of reading about amino acids, caffeine etc and this just happen to be my first try with a pre-workout. I don’t require a strong dose of caffeine so this gets the job done without crazy jitters. I have tried other pre-workouts since but I still purchase ON as well. Also several flavors mix quite well with vanilla protein powder to make tasty drinks.

Verified Buyer
  • 8 Concord Grape
  • 7 Green Apple
  • 8 Pineapple
  • 10 Juicy Strawberry Burst
  • 9 Orange Cooler

My favorite BCAA's. The energy is not overwhelming but it will keep you up through your entire workout. I've liked all of the flavors I've tried but the juicy Strawberry Burst is ridiculously good. It is literally the exact flavor of a pink starburst. Freezing it into a Popsicle is a nice healthy way to knock out cravings for sweets.

Verified Buyer
  • 9 Concord Grape
  • 5 Watermelon

Concord Grape is amazing, good taste! Watermelon just so bad, taste nothing like watermelon.

Verified Buyer
No written review.

I tried the bottled Blue Raspberry today after a workout. The taste was great and I felt good recovering


awesome product

Verified Buyer
  • 9 Iced Cafe Vanilla
  • 10 Orange Cooler

I have used Amino Energy as part of my daily routine for 5 years. I use it as a pre-workout, intra-workout and general energy source throughout the day. There were 3 of us in my office that has grown to 8. all individuals use it for various reasons mid day focus mid afternoon pick up as the day in the office progresses. We all appreciate the natural caffeine sources and great flavors. My favorites are Orange and Vanilla however, across all the supporters in the office we have most flavors covered and share with each others to try the different options. Some individuals or timing of the day or needed energy will use 1/2 - 2 or 3 scoops. Amino Energy is versatile to meet needs of many with so many great flavors. we will continue to support and promote the product in and out of the office. We have more teammates to share the benefits of the product, hopefully future users of this great product.

Verified Buyer
  • 10 Juicy Strawberry Burst

Tastes EXACTLY like a pink Starburst!

  • 10 Concord Grape
  • 9 Green Apple
  • 7 Strawberry Lime
  • 7 Blue Raspberry
  • 5 Iced Mocha Cappuccino
  • 7 Fruit Fusion
  • 7 Watermelon
  • 8 Blueberry Mojito
  • 8 Orange Cooler

I have bought all of these flavors over the past few months and grape is the best!

  • 10 Concord Grape
  • 9 Fruit Fusion
  • 8 Orange Cooler

Flavor taste so good. Caffeine kick in real good. Effective much. Although the servings are little but the price is affordable.

Verified Buyer
  • 1 Green Apple
  • 10 Juicy Strawberry Burst

I have liked many other flavors, but the Green Apple is AWFUL. I am unsure how it has such a high rating but it did not sit well in my stomach either. On the other hand, you MUST order the Juicy Strawberry Burst! It is the best flavor, especially if you have a sweet tooth like I do.

Verified Buyer
  • 10 Concord Grape
  • 4 Strawberry Lime
  • 10 Juicy Strawberry Burst
  • 10 Orange Cooler

This product has been great for me. Juicy Strawberry Burst tastes amazing, especially with some ice. It tastes so similar to a pink starburst! Orange Cooler, and Grape were also both very very good. Taking this gives me a nice wake up boost each morning, and helps my muscle soreness throughout the day.

Verified Buyer
  • 10 Peach Lemonade - Exclusive!

Best flavor ever! A bit tart which I love...not a bad aftertaste like some.

What's in Optimum Nutrition Essential AmiN.O. Energy

Serving Size 2 Scoops (9 g)
Servings Per Container25
Amount Per Serving % Daily Value *
Calories 5       
Total Carbohydrate 1 g <1%*
Calcium 30 mg 2%
Sodium 10 mg <1%
Amino Blend 5g **
Micronized Taurine, Micronized L-Glutamine, Micronized L-Arginine, Micronized L-Leucine, Beta-Alanine (as CarnoSyn®), Micronized L-Citrulline, Micronized L-Isoleucine, Micronized L-Valine, Micronized L-Tyrosine, Micronized L-Histidine, Micronized L-Lysine HCl, Micronized L-Phenylalanine, Micronized L-Threonine, Micronized L-Methionine
Caffeine 100 mg **
Green Tea Leaf Extract 50 mg **
Green Coffee Bean Extract 10 mg **
* Percent Daily Values are based on a 2,000 calorie diet.
† Daily Value not established.
Other Ingredients:
Natural Flavor, Citric Acid, Malic Acid, Silicon Dioxide, Calcium Silicate, Fruit And Vegetable Juice (Color), Tartaric Acid, Stevia Leaf Extract, Xanthan Gum, Caffeine (from Tea Leaf and/or Coffee Bean), Soy Lecithin.
‡ Total Caffeine from all sources is equal to 100 mg per serving (2 scoops).

Directions For Essential AmiN.O. Energy:

Mix two scoops of ESSENTIAL AMINO ENERGY in 10-12 oz of cold water.

FOR AN AMINO ACID BOOST: Consume one or more servings first thing in the morning and/or between meals.
FOR PRE-WORKOUT ENERGY: Take 1-3 servings 20-30 minutes before training.
FOR POST-WORKOUT RECOVERY: Take 1-2 servings immediately after training.

Do not exeed more than 5 servings per day.

TIPS: ESSENTIAL AMINO ENERGY contains 50 mg of caffeine per scoop, so do not consume after 5:00 PM if you have difficulty sleeping. ESSENTIAL AMINO ENERGY also contains beta-Alanine and may cause a temporary tingling sensation on your skin. This is normal. With continued use, the intensity of the sensation will decrease or disappear. Also, some people may have a sensitive stomach and will not tolerate green tea extract well on an empty stomach. If this is you, be sure to take with meals.

STICK PACKETS: BOTTLE OF WATER: Take a sip from a full 16.9 oz. bottle of water to make room for the powder. Add one packet of AMIN.O. ENERGY™ and shake bottle to mix well until powder dissolves.


Warnings: KEEP OUT OF REACH OF CHILDREN. Check with a qualified health care professional before taking this product if you are pregnant or nursing a baby, under 18 years of age, have any known or suspected medical conditions, and/or if you are taking any prescription or OTC medications. STICK PACKS: WARNING: Consult your physician before using this product if you are taking any medications or are under a physician's care for a medical condition. Not for use by those under the age of 18, women that are pregnant, or nursing, or those that are sensitive to caffeine or beta-alanine. Do not consume caffeine from other sources while taking this product as too much caffeine may cause nervousness, irritability, sleeplessness, and occasionally rapid heartbeat. Beta-Alanine may cause a harmless, temporary tingling or flushing sensation. Do not combine with alcohol. Do not exceed 3 packets within any 4 hour period or 5 packets within any 24 hour period. Consume as part of a healthy diet and exercise program, and drink at least 100 fl oz of water per day. Exercise may increase your need for fluid intake. Phenylketonurics: Contains Phenylalanine.

* 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.
Learn more about Amino Acids.