The short answer · Muscle mass
Take l-leucine for muscle mass. This is the one to buy.
Nutricost, L-Leucine, Unflavored, 17.9 oz (500 g)
4.7· 396 ratings· $0.20/serving
L-Leucine 5 g — inside the studied 2-5 g window
Of 1,442 products scored for Muscle mass, Nutricost, L-Leucine, Unflavored, 17.9 oz (500 g) ranks #1 with a DoseRank score of 83. L-Leucine is the strongest evidence signal for this outcome.
Retailer links may be affiliate links. Rankings and placement are never paid.
The form“Why L-Leucine — not Essential Amino Acids (EAA) or L-Isoleucine?”Evidence Strong evidence
L-Leucine is the strongest evidence signal for this outcome.
- L-LeucineThe pick
Strong evidence · 5 g
The most anabolic branched-chain amino acid, signaling through mTOR to trigger muscle protein synthesis. Dosed in higher ratios than isoleucine and valine in BCAA blends.
- Essential Amino Acids (EAA)
Strong evidence · 9250 mg
Blend of the nine amino acids the body cannot make; drives muscle protein synthesis and matters most when dietary protein is inadequate.
- L-Isoleucine
Limited evidence · 1793 mg
Branched-chain essential amino acid that aids muscle protein synthesis and glucose uptake. One of the three BCAAs, usually taken alongside leucine and valine for exercise recovery.
The dose“Is the dose actually effective?”Dose fit 90
L-Leucine at 5 g lands inside the studied 2-5 g window.
L-Leucine
Studied window 2-5 g · this pick 5 g
The ranking“Why should I trust this pick?”Trust 65
Mixed trust signals — ratings are positive but the base is limited. Each product gets a DoseRank score blending clinical strength, evidence, dose fit, trust and value. Retailer links may be affiliate links — the scoring model decides placement, never payment from a brand.
- 1,442 products scored
- Never paid placement
- Evidence level: Strong · 92
- 204 brands
- 8 ingredients
The price“Can I do better than $0.20 a serving?”Value 86
$0.20 per serving — low price tier for this outcome. Nothing else in this ranking costs less per serving.
Ready?
The #1 pick is $0.20 a serving.Nutricost, L-Leucine, Unflavored, 17.9 oz (500 g) — in stock at a tracked retailer.
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Nutricost, L-Leucine, Unflavored, 17.9 oz (500 g) ranks #1 for Muscle mass with a DoseRank score of 83. The score blends clinical strength, evidence, dose fit, trust signals and value across 1,442 products scored for this outcome.
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