EAAs, PerfectAmino, whey and pea+rice blends — what actually feeds the nervous system when whole food does not

What it claims

• PerfectAmino: '99% utilisation, no calories, builds lean muscle without whey'
• Kion Aminos: '8g EAAs, 3g leucine, best-in-class amino profile for recovery and lean-mass preservation'
• Thorne Amino Complex: 'clinically studied amino blend for cellular energy and lean muscle'
• Momentous EAAs: 'NSF Certified for Sport, complete essential amino profile for athletes'
• Momentous Whey Isolate / Naked Whey: '20–25g complete protein, grass-fed, third-party tested'
• Ritual Essential Protein 18+ / Vega Sport: 'plant-based, complete amino profile via pea + rice combination'

What the label is not telling you

• '99% utilisation' is a marketing number, not a nutrition science term. PerfectAmino cites internal calculations that treat EAA tablets as a reference against dietary protein absorption. Independent literature (Kim 2016, Am J Clin Nutr; Wolfe 2017) shows free-form EAAs absorb faster than whole-food protein (15–20 min vs 90–180 min), but total muscle protein synthesis stimulation depends primarily on leucine dose reaching ~2.5g per serving — not marketing terms like 'utilisation'. A 10-tablet PerfectAmino dose (~5g total aminos) delivers ~0.9g leucine, so 2 servings (20 tablets) are needed to hit the MPS threshold. Cost-per-effective-anabolic-signal is the worst in the category as primary protein.
• EAAs have zero non-essential amino acids. This is the honest disclosure the whole category needs to publish and does not. Glutamine, glycine, arginine, proline, alanine, serine, aspartate, asparagine, cysteine (conditionally essential) — none of these are in a straight EAA product. Rely on EAAs as your only protein source and the body has to manufacture the non-essentials by tearing down existing tissue (muscle, connective tissue, gut lining). EAAs are a supplement, not a replacement — a truth quietly missing from every EAA brand's homepage.
• Leucine per serving is the number that actually matters. Muscle protein synthesis switches on above ~2.5g of leucine per meal (Moore 2015, J Gerontol A; Phillips 2014). Kion (3g leucine per 8g serving) and Momentous EAAs (~2.5g per serving) clear the threshold in one scoop. PerfectAmino does not — you need 2 servings. Thorne Amino Complex is between (~2.0g leucine per 9g scoop).
• Whey isolate is still the price-per-leucine winner. Momentous Whey Isolate and Naked Whey deliver 20–25g complete protein at 2.5–3.2g leucine per serving for ~€1–1.50/serving. No EAA product on the market beats whey on price-per-effective-anabolic-signal. The case for EAAs is speed of absorption (pre-workout, first-thing-morning on a GLP-1) or lactose intolerance, not superiority.
• Plant EAAs / plant proteins require combining or blending to be complete. Pea protein alone is low in methionine. Rice protein alone is low in lysine. A pea+rice blend (Vega Sport, most Ritual Essential Protein 18+ formulations) delivers a full amino profile roughly equivalent to whey. Check the label: single-source pea or single-source hemp is not complete on its own for muscle-preservation targets in an adult.
• BodyHealth PerfectAmino (€65 / 300 tablets) — the original EAA tablet. Convenient (no shaking, no taste), well-tolerated, popular with older adults and travellers. Cost-per-leucine is the worst in the category and the tablet burden (10+ per full dose) becomes tedious. Honest use-case: travel, GLP-1 nausea windows, older adults who cannot tolerate whey — not primary protein.
• Kion Aminos (€45 / 30 servings) — the best-in-class powder EAA. 8g EAAs, 3g leucine per serving, cleanest ingredient list (no artificial sweeteners, no fillers), transparent third-party amino profile on the label. Best pre-workout EAA on the market. Use-case: fasted training, morning EAA on a GLP-1, adjunct to a lower-protein whole-food day.
• Thorne Amino Complex (€50 / 30 servings) — the amino blend for older adults. ~9g of a broader amino profile including some conditionally essential aminos. NSF Certified for Sport, well-tolerated, less leucine per serving than Kion. Use-case: adults over 50 preserving muscle, post-surgical recovery, chronic illness.
• Momentous Essential Amino Acids (€55 / 30 servings) — NSF Certified, athlete-focused. ~2.5g leucine, ~7g EAAs, clean label, NSF Certified for Sport (matters for competitive athletes). Kion is slightly better on leucine density; Momentous wins on third-party certification.
• Momentous Whey Isolate (€60 / 24 servings) — the reference whey. 20g complete protein, 2.5g leucine, NSF Certified for Sport, grass-fed. Best whole-protein powder on the market for competitive athletes. Naked Whey (€45 / 30 servings, single ingredient, unflavored, unsweetened) is the price-conscious alternative with the same underlying protein source.
• Ritual Essential Protein 18+ (€45 / 20 servings) — the clean plant blend. Pea + certified organic pumpkin seed, third-party heavy-metal tested, choline added, ~20g protein, ~2.2g leucine per serving. Well-formulated plant-based option. Slightly below whey on leucine per serving; add a scoop of hemp or an extra 5g for the threshold.
• Vega Sport (€45 / 20 servings) — pea + brown rice + sacha inchi. ~30g protein, ~2.5g leucine per serving, complete amino profile via multi-source blend. Third-party tested, NSF Certified for Sport (some SKUs). Good option for training-focused plant-based users. Chalky texture is the main complaint; the amino chemistry is legitimately complete.

Effect on the nervous system

The nervous system does not run on 'protein' as a category — it runs on 9 specific essentials, each of which becomes a specific piece of infrastructure. Tryptophan → serotonin (90% made in the gut) → vagal afferent signalling → sleep and mood. Tyrosine → dopamine → prefrontal drive. Histidine → myelin sheath around every nerve, including the vagus itself. Threonine → intestinal mucin → gut-barrier integrity → microbiome → vagal tone. Methionine and cysteine → glutathione → oxidative-stress buffering in the brain. When any of these run short — and in incomplete-protein diets, at least one is almost always running short — the downstream readout is predictable: shorter fuse, worse sleep, foggier mornings, more reactive gut, quieter dopamine drive, thinner hair. EAAs are the fastest way to close an acute gap (a 6am fasted training block, a GLP-1 nausea window, a travel day with only airport food). They are not a substitute for the 3–4 whole-food complete-protein meals that build the non-essential amino pool and feed the gut lining. The honest hierarchy: whole food first, complete-protein powder (whey or pea+rice) second, EAAs third — as an adjunct, never as primary.

Who it might suit

GLP-1 users — a morning EAA (Kion or Momentous) is one of the highest-leverage additions in the entire GLP-1 nutrition rulebook. Delayed emptying makes hitting 30g protein at breakfast hard; 8g EAAs pre-breakfast delivers the leucine signal in 15 minutes and takes 20ml of stomach space. Fasted training — 8g EAAs 20 minutes before a fasted workout preserves lean mass without breaking the fast for anabolic purposes. Older adults preserving muscle — Thorne Amino Complex or Kion Aminos as an afternoon insurance dose in addition to protein-forward meals. Travel days and hospital admissions — PerfectAmino tablets carry easily and stay stable at ambient temperature. Whole-food priority + insurance dose — most adults; whey isolate (Momentous, Naked) or a pea+rice blend (Vega Sport, Ritual) covers 90% of the need at 1/3 the cost of EAAs; add 5–8g EAAs only on the days whole-food protein falls short. Plant-based athletes — Vega Sport or Ritual Essential Protein 18+ with an occasional Kion adjunct.

Who should skip it

Anyone using EAAs as their primary protein source — the missing non-essentials cannibalise muscle, gut lining and skin. EAAs are always an adjunct. Anyone with kidney disease — check with a nephrologist before adding any concentrated protein or amino product; the kidney's nitrogen-handling capacity is the limiting factor. Anyone with PKU or other inborn errors of amino metabolism — obvious contraindication; work with a clinical dietitian only. Users chasing 'no calories' framing — EAAs do contain calories (~4 kcal/g of amino acids); the marketing rounds down aggressively. Users buying single-source pea or single-source hemp expecting a complete amino profile — combine with rice, or choose a pre-blended pea+rice product. Anyone paying €150+/mo for PerfectAmino tablets as primary protein — whey isolate at €50/mo hits the same anabolic signal 2–3x more effectively.

Bottom line

Amino-profile-per-euro ranking for 2026: (1) Naked Whey — €45 / 30 servings, 25g complete protein, 2.7g leucine, single ingredient. Cost-per-effective-anabolic-signal leader. (2) Momentous Whey Isolate — €60 / 24 servings, NSF Certified for Sport, the reference whey for competitive athletes. (3) Kion Aminos — €45 / 30 servings, best-in-class EAA powder, use as pre-workout or GLP-1 morning adjunct, not primary protein. (4) Momentous EAAs — €55 / 30 servings, NSF-certified alternative to Kion, essentially interchangeable. (5) Thorne Amino Complex — €50 / 30 servings, best EAA for older adults preserving muscle. (6) Ritual Essential Protein 18+ / Vega Sport — clean plant-based complete blends; Vega Sport slightly ahead on leucine per serving; Ritual slightly ahead on ingredient transparency. (7) BodyHealth PerfectAmino — €65 / 300 tablets, honest use-case is travel and GLP-1 nausea only; cost-per-leucine is the worst in the category as primary protein. Honest protocol: eat 1.2–1.6g/kg complete-source protein/day (2.0g/kg on a GLP-1 or in a deficit); use whey isolate or a pea+rice blend on days you cannot hit the floor from whole food; add 8g EAAs (Kion or Momentous) only for fasted training, morning GLP-1 windows, and travel. Read the amino profile on the label, not the marketing on the front. Complete beats total, every single time.