Essential AmiN.O. Energy
Optimum Nutrition

Essential AmiN.O. Energy

Amino Acid Powder with 5g of Free Form Amino Acids and 100mg of Caffeine from Natural Sources for Increased Energy and Focus*
Designed to Support Muscle Endurance and Recovery So You Can Train Longer and Harder*
8.9 out of 10 (2,549 Reviews)
7 Sizes
3 Packets
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2 Flavors
Strawberry Lime
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Price: CA$9.01 (CA$1.50 / 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
    4 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 NSF Certified for Sport
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
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 Into 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 own and 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
2,549 Ratings
Verified Buyer Rating
1,376 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 Concord Grape
  • 9 Green Apple
  • 4 Peach Lemonade - Exclusive!
  • 9 Cotton Candy
  • 10 Watermelon
  • 6 Blueberry Mojito

I love this product! I'm kind of weird with caffein; coffee makes me feel tired sometimes, but this is a very clean feeling energy. I vary the way I use it: I may use two scoops as a pre-workout if I need a boost, I'll drink a scoop of it if I'm fading and need a mental boost for homework, and I usually mix up a couple of scoops to sip on throughout the day when I work. I definitely feel like it helps with recovery, especially if used throughout a workout. I typically have 3-4 flavors in my cabinet so it doesn't get boring. The watermelon used to be my fav until I tried the concord grape. Watermelon is a little weaker of a flavor, but still amazing. Concord grape and green apple are intense flavors, but I usually use quite a bit of water to tone it down. All three taste just like the equivalent Jolly Rancher flavors. Cotton candy took a second to get used to, but is now my daily sipping flavor. I think it tastes more like Lucky Charms marshmallows than cotton candy though, but that's not a bad thing. Blueberry mojito was ok, but got old and tiresome really fast. Peach lemonade was awful.

Verified Buyer
  • 10 Concord Grape
  • 7 Watermelon
  • 7 Orange Cooler
  • 3 Naturally Flavored Simply Raspberry Lemonade

Love the product - especially concord grape. The simply rasberry lemonade is terrible...I have to choke it down.

  • 2 Blue Raspberry

I can't recommend this product at all. I bought it when it showed up at Costco and tried the Blue Raspberry flavor. It's gross. I choke it down as a supplement to my workout but honestly don't really feel much benefit from it. On the plus side it doesn't make me jittery but on the negative I don't get the added focus or energy that I have had from the same product by other brands. Also notable is the texture. It's a very fine powder, like casein consistency. While it blends quickly and easily, scooping it out is a mess.

Verified Buyer
  • 8 Strawberry Lime
  • 5 Blue Raspberry
  • 3 Naturally Flavored Simply Raspberry Lemonade

Not sure what happened, but the last Blue Raspberry that i got was terrible. Previously I would have rated this a 10, but based on this last batch it's moved way down. There is just no flavor. I have been using this for more than a year and always looked forward to my morning drink and now I can barely get it down. I just got the Strawberry lime to try something new and it's pretty good, but I have to add several scoops. The Simply Raspberry Lemonade had a horrible taste. Would really like to know if the formula changed or if I just got a bad batch of blue raspberry.

Verified Buyer
  • 8 Concord Grape
  • 10 Lemon Lime
  • 7 Orange Cooler

Been using for years, excellent flavor and mixes easily. Usually take one scoop upon waking and one scoop pre workout with 3g of Beta Alanine. Several times throughout the day have about 1/3 of a scoop in 25 ounces of water just for flavor. No jitters but don't notice any significant increase in focus or energy just a slight feeling of...alertness? Try to cycle off for month but might be getting addicted to the stuff:(

† This price is the retail price for this product found at one or more retail websites in the last 30 days. The price may not include shipping cost, tax, sale or promotional prices, or discounts such as member pricing. Prices may change. verifies this price every 30 days.

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

3 Packets Strawberry Lime
Serving Size 1/2 Packet (9 g)
Servings Per Container6
Amount Per Serving % Daily Value
Calories 5       
Total Carbohydrate 1 g <1%**
Amino Blend 5g
Micronized Taurine, Micronized L-Glutamine, Micronized L-Arginine, Micronized L-Leucine, CarnoSyn® Beta-Alanine, Micronized Citrulline, Micronized L-Isoleucine, Micronized L-Valine, Micronized L-Tyrosine, Micronized L-Histidine, Micronzed L-Lysine, Micronized L-Phenylalanine, Micronzed 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 Flavors, Malic Acid, Silicon Dioxide, Calcium Silicate, Caffeine (from Tea and/or Coffee Bean), Gum Blend (Cellulose Gum, Xanthan Gum, Carrageenan), Sucralose, Beet Powder, Lecithin, Inulin.
Allergen Information:
Contains Soy (Lecithin)
‡ Total Caffeine from all sources is equal to 100mg 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.


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.

* 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.