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Optimum Nutrition
Amino Energy
Our analysis — editorial take, not from the label
The one caffeinated pick here: 100 mg caffeine with a 5 g proprietary amino blend, making it closer to a light energy drink than a fully dosed EAA product.
- EAAs
- —
- BCAAs
- —
- Leucine
- —
- Servings
- 30
Price tier: Mid-range · relative cost per full serving across this database
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View current price at Amazon Compare all amino formulasScoop Sense doesn't collect user reviews and won't invent them. Read customer reviews on Amazon
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Long flavor list spanning fruit and coffee-shop options, sweetened with sucralose.
Label verified: July 2026 · View label source
Label data
Per full serving · 30 servings per container · from the manufacturer's panel
| Caffeine | 100 mg |
|---|---|
| Micronized amino blend | 5 g |
| Proprietary blend | Yes |
Primary label source: Muscle & Strength label listing · verified July 2026
Cautions
- Amino doses sit inside a proprietary blend, so individual amounts are not disclosed
- 100 mg caffeine per two-scoop serving counts toward daily caffeine intake
- Amino drinks supplement protein intake, not replace it
Formulated for healthy adults — not intended for anyone under 18. Full health & safety notes
Product details
Where this label sits
Optimum Nutrition Amino Energy is one of the amino formulas in the Scoop Sense database. The label uses at least one proprietary blend, so a blend total stands in place of the individual amounts inside it. It runs 30 servings per container at the full labeled serving. Everything on this page comes from the manufacturer's supplement facts panel as of July 2026 — never from the marketing page.
Key ingredients & studied doses
- Micronized amino blend · 5 g. Proprietary mix of essential aminos plus taurine, glutamine, arginine, and citrulline supporting protein balance and training.
- Caffeine (green tea and green coffee extracts) · 100 mg. Studied for supporting alertness and perceived energy during training.
Flavors & sweetener
Long flavor list spanning fruit and coffee-shop options, sweetened with sucralose.
Who it's best for
A BCAA-only formula — three of the nine essential amino acids, which suits taste-driven intra-workout sipping more than protein replacement. The added caffeine makes it double as a light pre-workout — count it toward your daily total. Skip it if you want every individual dose disclosed on the label. Derived from the label figures above — not medical advice.
How we log this label
Every entry is built the same way: we read the current supplement facts panel, log each disclosed dose, compare it against the amounts used in published research, flag proprietary blends, and state the cautions plainly. The full methodology explains each step.
This label against the research
How we evaluate labelsEach bar shows the amount commonly used in published human research, and where this label's dose falls against it. Research amounts are context, not a recommendation — they are not doses, and nothing here is medical advice.
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Caffeine100 mg
50% of the low end of the studied range0studied range 200 mg–400 mg450 mg
Performance studies most often use 3–6 mg per kg of body weight, which works out to roughly 200–400 mg for most adults. The FDA cites 400 mg a day as an amount not generally associated with negative effects in healthy adults.
Source: Guest et al., Journal of the International Society of Sports Nutrition 2021 — “Caffeine has consistently been shown to improve exercise performance when consumed in doses of 3–6 mg/kg body mass.”
One or more amounts on this label sit inside a proprietary blend, so the individual doses behind the blend total cannot be compared at all.
What other people say
Why we don't rate productsTwo different things, side by side: the rating the seller publishes on its own store, and what independent users write in public threads. Scoop Sense writes neither and collects no reviews of its own. Neither is evidence that a product works — they describe what people experienced and expected, not what the research shows.
On the seller's page
4.3 / 5
276 ratings
The brand's own storefront, read July 2026. A seller's rating is collected and moderated by the seller — treat it as a marketing figure, not an independent one.
What people actually report
Regular users describe Amino Energy as a reliable everyday pre-workout they've stuck with for years, though Optimum Nutrition has drawn complaints for quietly discontinuing popular flavors and variants.
- positive Habitual use / satisfaction. Some longtime users say they don't like starting a workout without it after using it consistently for over a year.
- negative Discontinued flavors/variants. Users have complained about Optimum Nutrition quietly discontinuing favorites like the Amino Energy + Collagen blend and the Cotton Candy flavor.
- mixed Caffeine level. A few people like how it makes them feel but wish for a version without the energy/caffeine blend for non-workout use.
Read the threads yourself
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“I like it, have been using it for a little over a year now. Honestly, I don't like to start a workout without it.”
r/Supplements thread, 2015 -
“So it seems like Optimum Nutrition has discontinued making Amino Energy + Collagen Powder. It is my favorite pre-workout supplement”
r/Supplements thread, 2024 -
“I love how it helps my body feel, but I don't need such a rush”
r/Supplements thread, 2018
Common questions about Optimum Nutrition Amino Energy
How much caffeine is in Optimum Nutrition Amino Energy?
100 mg per full labeled serving — roughly 1.1 small cups of coffee. The FDA cites about 400 mg per day as an amount generally not associated with negative effects in healthy adults, and coffee, tea, and energy drinks count toward the same total.
Is Optimum Nutrition Amino Energy an EAA or a BCAA product?
BCAA-only: it supplies the three branched-chain aminos but not the other six essential amino acids that full-EAA formulas include.
What does the proprietary blend in Optimum Nutrition Amino Energy hide?
The Micronized amino blend lists 5 g as a combined total. A blend total tells you the sum of its ingredients, not the individual doses inside it — which is why blend entries can't be checked against studied amounts.
Do the numbers for Optimum Nutrition Amino Energy assume one scoop or two?
All figures on this page are per full labeled serving. 100 mg caffeine per two-scoop serving counts toward daily caffeine intake.