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*
9.1  out of 10  (2,468 Reviews)
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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 In Cold 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
2,468 Ratings
Verified Buyer Rating
1,417 Ratings
Average Flavor Rating
33 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.
Apr 25, 2019
Verified Buyer
  • 10 Juicy Strawberry Burst

This Product was one of the best Amino acids I have used, whenever I am slump or too sluggish to workout this kicks me right in my game, it gives me the energy I need to complete my workout with a sick pump I have already recommended this item to a couple of my buddies so I would highly recommend this product

Apr 23, 2019
Verified Buyer
  • 4 Watermelon

I use this to wake up at work because my stomach does not like coffee. It works well without giving me those pins and needles most pre-workouts give me, maybe its because I don't use a large dose though. I bought watermelon and fruit punch after trying one that I enjoyed from Costco (I cant find it on the website so I think it was discontinued?). I haven't tried the fruit punch yet but the watermelon is NOT good.

Apr 19, 2019
Verified Buyer
  • 10 Orange Cooler
  • 10 Concord Grape
  • 9 Blueberry Mojito
  • 9 Iced Mocha Cappuccino

This product is awesome. Great to drink any time! My complain is really with the manufacturer. The 65-serving containers don’t have a seal under the lid. EVERY time I order one, it gets shaken around during shipping and a lot of it comes out. Everything in the box gets covered with it and you lose a lot of product. I only order the 30-serving size now.

Apr 07, 2019
Verified Buyer
  • 10 Half & Half Lemonade & Iced Tea

Tastes just like an Arnold Palmer. Very nice.

Mar 29, 2019
Verified Buyer
  • 10 Concord Grape
Mar 20, 2019
Verified Buyer
  • 7 Iced Chai Tea Latte
  • 9 Iced Cafe Vanilla
  • 7 Iced Mocha Cappuccino
Mar 10, 2019
  • 10 Fruit Fusion
  • 8 Strawberry Lime

I've been drinking this since 2012 and totally the same as another review - I always start my day with this (2 scoops) and 3 scoops before evening workouts. Something about the flavor just gives my senses a "ZING" and I get excited to start the day or workout. I recently purchased the larger container from another shop offline and the flavor is very different - much less intense flavor (manufactured date was almost a year ago, but it's not expired). This happens from time to time, so if you encounter a lack of flavor, I'd recommend giving it another shot from a new batch.

Feb 21, 2019
  • 10 Orange Cooler
  • 10 Blue Raspberry

I will not start my day without this stuff. It makes all the difference in the world. Since I’ve started drinking this every day is a good day. Been drinking this for about 3 years.

Feb 08, 2019
Verified Buyer
  • 10 Juicy Strawberry Burst

I love this product. I only use one scoop in the morning and it changes my whole day I’m more alert and I feel amazing. Strawberry burst is a really good flavor it’s a treat for my taste buds. I wish I had an unlimited supply

Feb 03, 2019
  • 1 Naturally Flavored Simply Watermelon

I've used ON BCAAs before and like them, the natural flavors were on sale and I generally like the idea of natural flavors, but this stuff is terrible. It tastes like cough syrup and I have to force each sip. The product itself is fine, the BCAAs help with soreness and the added caffeine gives your workout a nice boost but do NOT get this flavor.

Jan 24, 2019
Verified Buyer
  • 10 Juicy Strawberry Burst
  • 9 Concord Grape
  • 5 Fruit Fusion

Love this product! I don't drink coffee - don't like the taste. So it's great to have something as a pick me up in the mornings before work. I am very caffeine sensitive and this doesn't make me jittery or crash. I can add an additional scoop before a workout and I am good to go! Love the Strawberry flavor - I wish that came in a larger version! The grape is DELICIOUS and I always have a large canister of that on hand. The fruit fusion isn't awful but for some reason it reminds me of soap.

Jan 08, 2019
Verified Buyer
  • 10 Raspberry Black Tea

If it's your first time using this product or you're looking for a flavor switch, this one is THE BEST.

Jan 05, 2019
Verified Buyer
  • 10 Blue Raspberry
  • 8 Juicy Strawberry Burst
  • 6 Cotton Candy
  • 2 Naturally Flavored Simply Raspberry Lemonade
Dec 31, 2018
Verified Buyer
  • 9 Orange Cooler
  • 9 Watermelon

Good BCAA, take it before, during and after workouts. On off days its a night little pick em up with100mg caffeine. Definitely good value.

Dec 11, 2018
  • 10 Fruit Fusion
  • 9 Watermelon

Use this product every morning before I hit the gym. Gives me tons of energy!

5 Sizes
6 Stick Packs
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4 Flavors
Fruit Fusion
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Price: $9.19  ($1.53 / Serving)
Flavor Rating: 8.6

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

Serving Size: 1 Packet (9 g)
Servings Per Container6
Amount Per Serving % Daily Value
Calories 10       
Total Carbohydrate 2 g 1%*
Amino Blend 5g **
Micronized Taurine, Micronized L-Glutamine, Micronized L-Arginine, Micronized L-Leucine, Beta-Alanine (as CarnoSyn®), Micronized Citrulline, Micronized L-Isoleucine, Micronized L-Valine, Micronized L-Tyrosine, Micronized L-Histidine, Micronized L-Lysine Hydrochloride, Micronized L-Phenylalanine, Micronized L-Threonine, Micronized L-Methionine
Energy Blend‡▲ 160mg **
Caffeine‡, Green Tea Extract (Camellia sinensis)(leaf), (standardized for Epigallocatechin gallate (EGCG)), Green Coffee Extract (bean)
* Percent Daily Values are based on a 2,000 calorie diet.
** Daily Value not established.
Other Ingredients:
Citric Acid, Malic Acid, Natural And Artificial Flavor, Inulin, Beet Color, Tartaric Acid, Silicon Dioxide, Calcium Silicate, Caffeine (from Tea and/or Coffee Bean), Gum Blend (Cellulose Gum, Xanthan Gum, Carrageenan), Sucralose, Soy Lecithin, Yellow #5, & 6.
‡ Total Caffeine from all sources is equal to 100mg per serving (1 packet)

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.
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