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  (2,440 Reviews)
5 Sizes
6 Stick Packs
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4 Flavors
Blue Raspberry
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Price: $7.99  ($1.33 / Serving)
Flavor Rating: 8.5
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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 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
2,440 Ratings
Verified Buyer Rating
1,396 Ratings
Average Flavor Rating
29 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 Lemon Lime

Amazing flavor and a nice change to sip on during your workout besides just plain old water.

Verified Buyer
  • 10 Peach Lemonade

Wow, this flavor legitimately tastes like peach rings and I am SO happy about it.

Verified Buyer
  • 10 Naturally Flavored Simply Peach Tea

Finally an essential amino product with no artificial color or sweetener that doesn’t cost an arm and a leg. Great taste, easy mixing, will definitely be buying more.

Verified Buyer
  • 7 Naturally Flavored Simply Raspberry Lemonade

Love this stuff but can i get a longer scoop? Lol after about half is gone I cant reach anymore without making a mess. Longer scoop or shorter container please.

Verified Buyer
  • 9 Concord Grape
  • 10 Watermelon
  • 8 Orange Cooler

Love it. Although, I will try naturally flavored since they seem to have a lot of sugar and they don't disclose the amount of sugar you get per serving.

Verified Buyer
  • 10 Blue Raspberry
  • 10 Half & Half Lemonade & Iced Tea

I add 4 scoops to my gallon every morning and ts perfect! Not too concentrated and not too much caffeine. So delicious it makes drinking a gallon easy!

Verified Buyer
  • 7 Blue Raspberry
  • 8 Peach Lemonade
  • 8 Watermelon
  • 9 Juicy Strawberry Burst
  • 8 Raspberry Black Tea

Juicy Strawberry burst is easily the best tasting. Tastes just like a pink starburst.

Verified Buyer
  • 3 White Peach Tea

The white peach tea is much left to desire for... The concept of adding this flavor in their line-up is a great idea but the taste is ... "somewhat lacking". I thought this would taste like a Snapple white peach tea (expected to be artificially sweetened like the other basic flavors) but I was sadly mistaken. Mainly, it is the strange AFTERTASTE that got me somewhat "dissatisfied". First, always use cold water for the tea series, room temperature water just makes it disgusting. However whether you use cold water or not, you can smell that particular aftertaste; I can't put my fingers as to what this taste like but sort of like the tea bag is left sitting in your cup for 2-3 days with the tea leafs out of the bags with a very slight fermentation of baby poop (this is the best way to describe it in my opinion?). You do taste the actual peach flavor for 2-3 seconds and then its that aftertaste. The taste isn't nauseating or make you want to vomit but its a bitter, 'not too good' taste. If you want to try go ahead, its certainly "manageable" to drink if you train your mind to forget the aftertaste. Preferably, I rather would like ON to reformulate the tea series to actually tasting like "snapple-ish" without any bitterness or 'off-taste' to it (whether its artificially and/or naturally flavored); all I care is how it taste like with the same amino energy preworkout content I get with the other flavors.

Verified Buyer
  • 5 Iced Mocha Cappuccino

My little trick is to mix the ON Iced Mocha flavor ENERGY with the ON 100% Whey Extreme Chocolate flavor PROTEIN powder. Helps the flavor tremendously, and is a pretty good iced coffee substitute.

Verified Buyer
  • 9 Iced Cafe Vanilla
  • 10 Peach Lemonade
  • 1 Half & Half Lemonade & Iced Tea

I love the peach lemonade and the vanilla latte but the half and half lemonade iced tea is absolutely disgusting. The flavor is terrible and I can’t even drink it. Not only does it leave a bad after taste, it’s hard to drink to begin with because the way it tastes. I will stick with my normal flavors but I would stay far from the half and half. I will note the vanilla latte seems to have changed in flavor slightly. It’s still good but I just think the mix has changed.

Verified Buyer
  • 10 Juicy Strawberry Burst

the best in boosting energy, I use this product for night school, working out mid afternoon boost. Its great.

Verified Buyer
  • 10 Concord Grape
  • 10 Lime Mint Mojito
  • 3 Strawberry Lime
  • 5 Fruit Fusion
  • 9 Pineapple
  • 8 Watermelon
  • 7 Orange Cooler
Verified Buyer
  • 10 Concord Grape
  • 7 Orange Blast

I’ve been using this product for years and I love it. I’ve tried it as a pre-workout supplement but I found that it works best for me intra-workout. Would recommend this product to anyone.

Verified Buyer
  • 9 Strawberry Lime
  • 6 Orange Cooler
  • 9 Raspberry Black Tea
  • 1 Naturally Flavored Simply Watermelon

I've been using this product for a few years, on and off and it is my #1 recommendation for first time user of pre-workout. These flavors taste best with ice cold water, natural watermelon, not so much.

Verified Buyer
  • 10 Concord Grape
  • 7 Orange Cooler

Not too much caffeine for me, I like to take it before I ride my bike. Too much for before I run though. Grape FTW

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, Natural And Artificial Flavor, Malic Acid, Tartaric Acid, Silicon Dioxide, Calcium Silicate, Caffeine (from Tea and/or Coffee Bean), Sucralose, Gum Blend (Cellulose Gum, Xanthan Gum, Carrageenan), Soy Lecithin, Blue #2, Inulin.
‡ 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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