Head to head · Amino Acids (BCAA & EAA)
Nutricost EAA Powder vs Optimum Nutrition Essential AMIN.O. Energy
Nutricost and Optimum Nutrition finish level in our scoring (7.0 vs 7.0), so the right pick depends on what you value most — Nutricost is stronger on value and transparency, Optimum Nutrition on quality & purity and experience.
Updated September 2026 from our full reviews · How we score
A budget EAA powder at about $0.67 a serving that includes all nine essential amino acids, but 6 of its 8 g are BCAAs and several others are only token amounts.
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A hugely popular caffeinated amino drink: 100 mg natural caffeine plus a 5 g proprietary amino blend led by taurine, glutamine and arginine, so EAA doses are unknown.
We may earn a commission when you buy through these links — it never affects our scores. How we make money
We may earn a commission when you buy through these links — it never affects our scores. How we make money
The short answer
Choose Nutricost if…
- Budget buyers who want a flavored amino drink
- Sipping during training when a protein shake isn't practical
- Vegetarians who want a meat-free amino acid supplement
- You care most about value, transparency
Choose Optimum Nutrition if…
- A mild, flavored caffeine boost before training
- A sugar-free alternative to soda or energy drinks
- Athletes who want an Informed Choice certified energy mix
- You care most about quality & purity, experience
Side by side
| EAA Powder | Essential AMIN.O. Energy | |
|---|---|---|
| Our score | 7.0 / 10 | 7.0 / 10 |
| Efficacy (30%) | 5.8 | 5.8 |
| Quality & Purity (25%) | 7.0 | 8.3 |
| Value (20%) | 8.0 | 6.8 |
| Experience (15%) | 8.0 | 8.5 |
| Transparency (10%) | 7.5 | 5.0 |
| Form | Powder | Powder |
| Serving | 1 scoop (11 g)30 servings per container | 2 scoops (9 g)30 servings per container |
| Testing & certifications | Third-party testedcGMP facility | Informed Choice |
| Dietary | Vegetarian, Gluten-free, Non-GMO | Sugar-free |
| Key ingredients |
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|
| Flavors | 5 (Fruit Punch, Blue Raspberry, Peach Mango…) | 8 (Watermelon, Blue Raspberry, Concord Grape…) |
| Creator video reviews | 2 | 3 |
Pros and cons
EAA Powder
- About $0.67 per serving, among the cheapest EAA powders
- Lists all nine essential amino acids with a fully disclosed label
- 4.7 stars from roughly 890 buyer ratings, with taste widely praised
- Brand says every batch is tested by ISO-accredited labs
- 6 of 8 g are BCAAs; methionine is only 10 mg
- Less complete than the same money spent on protein powder
- No named third-party certification
- Blue Raspberry flavor carries a California Prop 65 lead warning on the brand site
Essential AMIN.O. Energy
- 100 mg of caffeine per serving from green tea and coffee bean extracts
- Zero sugar and 14 flavors, with taste praised across thousands of reviews
- ON's support site lists it as Informed Choice certified
- Mixes easily and costs under $1 per serving
- Proprietary 5 g amino blend hides individual amino acid doses
- Blend is led by taurine, glutamine and arginine; tryptophan is not listed
- Some buyers report nausea or cramps; beta-alanine can cause tingling
- Caffeine adds up quickly with coffee or other stimulants
Our verdicts
EAA Powder
Nutricost EAA is cheap, tasty and better grounded than a pure BCAA drink because it includes all nine essential amino acids. The formula is so BCAA-heavy, with only token amounts of several essentials, that it falls short of the balanced profile research favors. It is fine as a low-cost training drink, but a scoop of protein powder delivers more complete amino acids for similar money.
Full review
Essential AMIN.O. Energy
Essential AMIN.O. Energy is a well-liked, Informed Choice certified drink mix with a moderate caffeine dose and excellent flavors. As an amino acid supplement it disappoints: the proprietary blend hides every dose and is led by non-essential amino acids. Buy it for taste and a mild energy lift, not for muscle building.
Full review