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  (2,450 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

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
2,450 Ratings
Verified Buyer Rating
1,402 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.
Nov 18, 2018
  • 8 Green Apple

LOVE this product, gives a nice 'pick me up' energy and helps me recover faster than i normally would but with all that being said, the green apple flavor is more like a sour apple candy flavor so if you don't like sour flavors than please try a different one and the main reason i rated this an 8 is because of the unnecessary artificial color.. besides that this product is fantastic.

Oct 19, 2018
  • 10 Strawberry Lime
  • 1 Iced Mocha Cappuccino

Strawberry Lime has interesting taste. It is a little bit sweat and taste does not bother. Iced Mocha Cappuccino - the most terrible flavor, which I have ever tested. It smells like coffee, bitter disgusting taste. I do not recommend it to anyone. I think from 100 people maybe only 1 will like it. It is so terrible that I wish to drink it as fast as I can.

Sep 28, 2018
Verified Buyer
  • 10 Watermelon
  • 10 White Peach Tea

This products helps me kick start my day with the caffeine and beta-alanine. I replaced coffee with this product because the energy feels smoother and overall easier to digest. I was impressed with the white peach tea flavor. As someone who likes to drink tea it is refreshing to have my aminos and caffeine under a tea flavor to sip in the morning or during any daily activity. I mainly get this product for the focus it gives me.

Sep 24, 2018
  • 10 Concord Grape

Have been very pleased. Great energy. Great taste without being overbearing. Grape tastes like grape Koolaid. Nice BCAA support. I keep this product for daily use.

Sep 20, 2018
Verified Buyer
  • 9 Iced Cafe Vanilla
  • 9 Iced Mocha Cappuccino

In water I dont feel they are that great, I add them to my coffee and they are Fantastic for taking the place of a coffee creamer.

Sep 19, 2018
Verified Buyer
  • 9 Peach Lemonade

After every workout I take this along with my creatine. It helps me get through the school day without being completely worn from my workout. I wouldn’t say I get any energy from it, I do have a bit of a tolerance to stims though, but I feel like my recovery starts sooner and works better. Even at 25 years old, as a college student my diet tends to suffer on occasion (not eating enough) so this has been a great way to make sure I’m hitting or **** close to my daily requirements and the discounts are frequent. Flavor wise, which is what motivated me to write this, I’ve bounced around a bit as I prefer some change. The Peach Lemonade on it’s own with water is ehhh at best. Not bad, but not much better tasting than normal water. When I added about a cup of frozen fruit (peaches, strawberries and other mixed things) to it and blended it, it’s amazing. I may actually stick to this flavor so I can have something tasty in the morning and get fruit into me more regularly.

Sep 16, 2018

This is such a terrible product. It's outdated formula and ON doesn't care about your goals otherwise the formula would have been updated years ago. They care about the money you're giving them. The formula is frontloaded by Turbine, Beta-Albanians, and Glutamine. You're barely getting any BCAAs and EAAs from taking this. If you're serious about your results than I would suggest you spend your money on a higher dosed EAA product. Also, don't take this post workout. Not a post workout whatsoever. Stop taking this if you're actually serious about recovery and increasing your muscle protein synthesis. The only thing this product is good for is flavoring your gallon jug of water or when you're too lazy to make coffee.

Aug 31, 2018
Verified Buyer
  • 10 Green Apple
  • 4 Blue Raspberry
  • 10 Lemon Lime
  • 1 Iced Mocha Cappuccino
  • 10 Watermelon
  • 10 Juicy Strawberry Burst
  • 8 Orange Blast

I’ve been using ON Amino for over a year now and boy let me tell you, I have influenced almost 20 people within my workplace in Marion, OH at Whirlpool to drink this stuff! It’s purely awesome. The only change that I hope ON does soon is GET RID OF THE COLOR DYES!!! We don’t need this to look pretty, just taste good. I don’t care if it looks like poo, get rid of the color dyes please and I’ll buy more lemon lime. I will not buy lemon lime anymore until the yellow 5 and 6 are gone. Other than the food dye request, this is awesome stuff!! I highly recommend all of these to everyone. I personally have been buying watermelon, juicy strawberry burst and black raspberry tea mainly because they use beet extract for coloring. I used to drink 1-2 energy drinks a day and drink pop constantly and this has helped me completely get rid of pop. I buy packs of water bottles, put two scoops and drink one in a 10 hour shift. This stuff helps with focus, helps your body repair muscles quicker, helps rid of body aches, it’s awesome!!!

Aug 29, 2018
Verified Buyer
  • 10 Concord Grape
  • 8 Blueberry Mojito

LOVE the Grape! Blue Mojito is a good change up. I like the quick rush I get. Not overpowering to where I get jittery and does not last too long so as to affect sleep. I will drink it during the day at work as a pick me up.

Aug 22, 2018
Verified Buyer
  • 10 Green Apple
  • 10 Pineapple
  • 10 Juicy Strawberry Burst
  • 8 Orange Cooler

My only go to pre-workout because its so yummy. Good enough for my workout. I can control the amount of caffeine i need as well.

Aug 18, 2018
Verified Buyer
  • 10 Lemon Lime

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

Aug 16, 2018
Verified Buyer
  • 10 Peach Lemonade

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

Aug 14, 2018
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.

Aug 14, 2018
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.

Aug 14, 2018
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.

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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