CuratedFit
CURATEDFIT SUMMARY
Passes because this is about as clean as a formulated amino acid product gets, three actives, each with an individually disclosed exact milligram amount, and nothing else in the ingredient list beyond the capsule shell itself. No sweeteners, no flavourings, no fortification vitamins, none of the additions that commonly fail products in this category.
WHAT IT IS
A vegetable capsule providing branched-chain amino acids at a 2:1:1 ratio, L-Leucine 1,200mg, L-Isoleucine 600mg, L-Valine 600mg, per 4-capsule daily serving. BCAAs, leucine specifically, are directly tied to triggering muscle protein synthesis, and this ratio matches the standard research-referenced proportion for this ingredient category.
WHO IT IS FOR
Anyone wanting a targeted leucine boost, most relevantly here, someone using a plant-based protein source that comes in lower on leucine than whey (see the Sevenhills Wholefoods vegan protein review), where this closes that specific gap rather than needing to switch protein sources entirely.
INGREDIENT BREAKDOWN
L-Leucine
1,200mg
Free-form amino acid
L-Isoleucine
600 mg
Free-form amino acid
L-Valine
600 mg
Free-form amino acid
The 2:1:1 Ratio
This is the most commonly researched BCAA ratio, and all three amounts are disclosed individually rather than left as a single combined total, avoiding the undisclosed-ratio issue that has failed other multi-form products in this catalogue.
Other ingredients
Vegetable Cellulose (capsule)
CERIFICATIONS
Informed Sport
Not Confirmed
Banned substance tested
Not Confirmed
GMP Certified
Not Confirmed
Heavy metals tested
Not Confirmed
BRCGS
Not Confirmed
FSSC 22000
Not Confirmed
CURATEDFIT STANDARD CHECK
Info
As Natural As Possible
Free-form amino acids are typically produced via fermentation of plant sugars industry-wide, a biological rather than chemical-synthesis route, and a shift away from older animal-derived hydrolysis methods (e.g. from feathers or hair). This product's specific sourcing method wasn't confirmed on the sources reviewed, so this stays Info rather than Pass until independently confirmed
Info
Contains What It Claims
Amounts are disclosed precisely and consistently across manufacturer and retailer listings. CuratedFit has not seen independent lab verification of these figures
Pass
Every Ingredient Earns Its Place
Only one other ingredient, the vegetable capsule shell, nothing else in the formula
Pass
No Insect-Derived Ingredients
No animal or insect derived ingredients present
Pass
No Proprietary Blends
All three amino acids individually disclosed with exact milligram amounts
Info
Allergen Declaration
No explicit allergen statement found beyond the ingredient list itself. Manufacturer states the product is gluten free
Pass
Sugar Content Declared
No sugar ingredient present
Pass
Artificial Sweeteners and Flavorings
None present
Info
Heavy Metals and Contaminants
Not addressed via any of the six specific certifications checked
Pass
Banned Substance Risk Declared
Three standard amino acids, not banned substances
Pass
Country of Manufacture Noted
Confirmed. Manufacturer and multiple retailer listings state this product is manufactured in the USA
TRANSPARENCY NOTE
The sourcing method for these specific amino acids, fermentation versus another production route, wasn't confirmed on the sources reviewed, which is why criterion 1 stays Info rather than Pass despite fermentation being the modern industry standard for this ingredient category. Worth confirming directly with the manufacturer if vegan sourcing needs to be guaranteed rather than assumed.
On dosing: 1,200 mg of leucine at the full 4-capsule serving is a meaningful addition on its own, and specifically relevant when paired with a lower-leucine protein source. This is worth cross-referencing against the Sevenhills Wholefoods vegan protein review for the specific leucine gap figures, since that comparison hasn't been independently re-verified here.
One safety point deserves direct mention rather than staying buried in fine print. The manufacturer explicitly states this product should not be used by individuals with ALS or disorders that impair branched-chain amino acid metabolism. This is a specific, meaningful caution rather than routine boilerplate, and it belongs in front of anyone considering this product, not just in the small print.
FREQUENTLY ASKED QUESTIONS
Why pair this with a lower-leucine protein source specifically?
A plant-based protein source can come in lower on leucine than whey. This product's 1,200 mg of leucine at the full serving is a direct, targeted way to close that kind of gap without needing to switch protein sources entirely.
Is this vegan?
Almost certainly, given fermentation is now the standard production method for free-form amino acids across the industry, but this specific product's sourcing wasn't independently confirmed. Worth checking directly with Life Extension if that needs to be guaranteed.
Does this need to be taken with protein, or does it work alone?
BCAAs are typically used alongside adequate total protein intake, not as a replacement for it. This is a targeted addition, not a substitute for the amino acids delivered by a complete protein source.
Is this safe for everyone?
No. The manufacturer explicitly states this product should not be used by individuals with ALS or any disorder that impairs branched-chain amino acid metabolism. Anyone with a relevant condition should consult a healthcare practitioner before use.
Where is this manufactured?
Confirmed as manufactured in the USA, per the manufacturer and multiple retailer listings.
Has this been tested for heavy metals or contaminants?
Not confirmed via any of the six specific certifications this review checks.
Last reviewed:
8/12/26
Life Extension Branched Chain Amino Acids product listing (lifeextension.com, lifeextensioneurope.com), cross-referenced against Vitacost, Amazon, iHerb, and Boulevard Pharmacy for ingredient, dosage, manufacturing, and safety caution consistency.
Sources:
Last updated:
8/12/26
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