Facts checked on October 30 to 31, 2026. Prices and formulas change; check each brand's own site before you buy.
Price per serving is the number most supplement pages lead with, and it can mislead: brands define a serving differently and suggest different numbers of servings a day. This index lists eleven essential amino acid (EAA) supplements with the price per serving bought once, the price on subscription, and, where the brand states a daily dose, the cost per day at that dose. Every figure comes from the brand's own page and is dated. We make one of the products, Rejuvenate Muscle Health, and it is listed in the same way as the rest.
What the numbers show
- Per serving, one-time prices range from about $0.70 (XTEND EAA) to $3.17 (The Amino Company Life).
- Per day depends more on the suggested dose than on the label price. At the doses the brands themselves suggest, Perfect Amino runs about $2.18 to $6.12 a day and OptimalAmino $1.27 to $5.07; Rejuvenate is $2.14 to $4.28 a day at two sticks.
- Subscriptions cut most prices by 10 to 25%.
- Several brands do not state a daily dose on the product page, so a per-day cost cannot be worked out for them from their own information.
See Rejuvenate Muscle Health$1.07 a serving on the first 12-Week Supply order, with a 90-day money-back guarantee on that supply.
| Format | Per serving, one-time | Per serving, subscription | Suggested servings a day | Cost per day at that dose | |
|---|---|---|---|---|---|
| XTEND EAA (Cellucor) | Powder | $0.70 | $0.49 (sale or subscribe) | Not stated | Not stated |
| Naked EAAs | Unflavored powder | $0.80 | $0.64 | Not stated | Not stated |
| Optimum Nutrition Essential AMIN.O. Energy | Powder, with caffeine | $0.92 | Sale price $0.73 | Not stated | Not stated |
| OptimalAmino | 10 tablets or 1 scoop | $1.27 | $1.27 | 1 to 4 | $1.27 to $5.07 |
| Perfect Amino (BodyHealth) | 5 tablets or 1 scoop | $1.28 to $1.53 | From $1.09 | 2 to 4 | $2.18 to $6.12 |
| Transparent Labs Intra Workout EAA | Powder | $1.50 | $1.35 | Not stated | Not stated |
| Momentous Vital Aminos | Powder | $1.67 | $1.25 | Not stated | Not stated |
| Thorne Amino Complex | Powder | $1.73 | $1.56 | Not stated | Not stated |
| Rejuvenate Muscle Health | 1 stick in water | $2.14 (single box) | $1.61 (4-Week Supply); $1.07 (first 12-Week Supply order) | 2 | $2.14 to $4.28 |
| The Amino Company Life | Powder, 1 scoop (6 g) | $3.17 | $2.69 | 1 (up to 3 scoops for stronger results) | $3.17 at 1 scoop; $9.50 at 3 |
| Kion Aminos | Powder or capsules | $49.95 a tub (servings per tub not stated) | About $45 a tub | Not stated | Not stated |
How we worked it out
- We took each brand's own listed price for its standard size, bought once and on subscription, on October 30 and 31, 2026.
- Price per serving is that price divided by the servings the brand states for that size. Where a brand shows a range of sizes, the range is shown.
- Cost per day uses only the number of servings the brand itself suggests on its product page or user guide. Where no daily dose is stated, we leave it blank rather than assume one.
- We did not include shipping, taxes, coupons or HSA/FSA savings.
Sources for every product are listed at the end. Facts and prices are kept in a dated fact sheet and re-checked quarterly.
Why per day matters more than per serving
Two products at the same price per serving can cost very different amounts a day. Perfect Amino and OptimalAmino both suggest up to four servings a day; at the top of that range, the daily cost is four times the per-serving price. Rejuvenate's routine is two sticks a day, hours apart, so its daily cost is twice the per-serving price. Compare the cost of the way you will actually take it.
What the price does not tell you
- Serving size and dose differ. Servings range from a 5-calorie stick to a 10 g scoop of amino acids, and some products add caffeine, electrolytes or other ingredients.
- Disclosure differs. Kion, Thorne and OptimalAmino list the amount of each amino acid; Perfect Amino and Rejuvenate list a blend total.
- Certification differs. Thorne, Momentous and OptimalAmino are NSF Certified for Sport, and Perfect Amino sells certified versions.
- Format matters if you will not keep taking it. The cheapest supplement is no bargain if it stays in the cupboard.
For side-by-side comparisons, see Perfect Amino alternatives and all our comparisons.
See Rejuvenate Muscle Health$1.07 a serving on the first 12-Week Supply order, with a 90-day money-back guarantee on that supply.
Questions people ask
What is the cheapest essential amino acid supplement per serving?
Of the eleven in this index, XTEND EAA at about $0.70 a serving one-time, and Naked EAAs at about $0.80, or $0.64 on autoship. Prices checked October 30 to 31, 2026.
How much does Perfect Amino cost per day?
Perfect Amino is $1.28 to $1.53 a serving bought once and from $1.09 on subscription. BodyHealth suggests 2 to 4 servings a day, which works out to about $2.18 to $6.12 a day.
How much does Rejuvenate Muscle Health cost per day?
At two sticks a day: about $2.14 a day on the first 12-Week Supply order, $3.21 on the 4-Week Supply, and $4.28 from single boxes.
Why is cost per day missing for some products?
We only use the daily dose a brand states itself. Where the product page does not suggest a number of servings a day, we leave the per-day cost blank rather than guess.
Can I use these figures in an article?
Yes. Please link to this page and keep the date, since prices change.
Sources: BodyHealth, Perfect Amino tablets; BodyHealth, Perfect Amino user guide; OptimalAmino tablets; Thorne Amino Complex; Kion Aminos; Momentous Vital Aminos; Naked EAAs; Optimum Nutrition Essential AMIN.O. Energy; Transparent Labs Intra Workout; XTEND EAA; The Amino Company, Life. Competitor claims are quoted as each brand states them. Rejuvenate Muscle Health is not affiliated with the other brands named here; their names are trademarks of their owners.
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