Essential AmiN.O. Energy
Optimum Nutrition

Essential AmiN.O. Energy

Amino Acid Powder for Increased Energy*
Train Longer and Harder with Intense Energy and Focus*
8.9 out of 10  (2,521 Reviews)
6 Sizes
3 Packets
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2 Flavors
Strawberry Lime
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Price: $6.99 ($1.16 / Serving)
Flavor Rating: 8.6

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
2,521 Ratings
Verified Buyer Rating
1,355 Ratings
Average Flavor Rating
23 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
  • 9 Iced Mocha Cappuccino
  • 7 Watermelon
  • 10 Blueberry Mojito

This product tastes great and has an affordable price point. I use BCAAs/Aminos on a daily basis to help with recovery, and I am happy with this product. Great work, ON!

Verified Buyer
  • 10 Concord Grape
  • 8 Blue Raspberry

Concord Grape is by far the best Flavor in my opinion. :)

Verified Buyer
  • 10 Peach Lemonade - Exclusive!

I've tried the exclusive blueberry lemonade and the peach leonade both are amazing!

Verified Buyer

User Audience For this product, I tried the flavor of Concord Grape and it was phenomenal. It was my first flavor that I purchased for Optimum Nutrition Essential AmiN.O. Energy. Since using this product I have found that the ideal user can be anyone wanting a morning booster, a pre workout or an afternoon pick me up. This provides a great alternative to coffee as it keeps me alert throughout the day while not having any tingling sensation or jitters that coffee causes. It can be used by audiences of all kinds, including the average person or an athlete who would get its nutritional benefits of having amino acids in the drink. Since this product is a supplemental drink with caffeine, I would not recommend that children should be users of this product. Rating Criteria The criteria that I used to evaluate this product are the following three things: taste, endurance, and focus. The reason that I chose these three evaluation criteria’s is because they serve as the essential use for the product. First, a good tasting product will allow the user to enjoy drinking this over the standard coffee flavor or pre-workout drink that sometimes tastes like cough syrup. Endurance is another valuable feature that this product must possess because this type of drink promotes “Increased Energy.” Also, focus is another thing that I decided to use as a rating criteria because I believe it’s what sets a drink apart from others. Focus can be misleading from people that drink coffee and think that the caffeine will help them focus more, but end up just feeling jittery and cause uncomfortable lapses of time after drinking it. Characteristics I have tried two different types of this product, Concord Grape and Orange Cooler. I would rate the grape flavor at a 6/10 and the orange flavor at an 8/10 with 10 being the best flavor possible for this product. For endurance I would rate this product a 9/10. The focus that this product allows me to have would be a 7.5/10. In my opinion, the best characteristics of this product is the endurance that this product has given me throughout the day. I can take a serving early in the morning before my workout and it will last me all through the day without any lapse in energy, no matter how hard the workout was. Some days where I get lack of sleep the night before I will take an extra half serving, but this product’s endurance is the most positive aspect I’ve experienced. Since using this product about a month ago, I have not experienced any negative characteristics for this product. I will continue to be a customer of this product because I am so satisfied with the results that it has given me.

Verified Buyer
  • 10 Iced Cafe Vanilla
  • 10 Pineapple
† 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.