Everything DoseRank tracks on the amino acid blends shelf — L-Leucine. The category itself is never ranked: 168 products get scored the moment you say what you want them to do.
How to read the scores
This legend covers the scores on this page — for data sources, scoring weights, and limits, read the full methodology →
Answer a few questions about your goals, habits, stack, and budget. Then, DoseRank will find the products that best match your needs based on your answers. It's free and only takes 60 seconds! No account is required.
A saved, shareable breakdown: your matched products, dose math, interaction flags to discuss with a clinician, and a price-tracked stack you can revisit.
Questions
Each product gets a composite score blending clinical strength, evidence, dose fit, trust and value — computed for the goal you picked, across this category's products. The #1 on the DoseRank tab has the highest composite; the other tabs re-rank the same products by Value, Trust, or Popularity. Placement is never paid.
Start with a goal, not a brand
Browsing amino acid blends supplements without a goal makes no sense — different products do different jobs, and “best” flips depending on which job you're hiring for. These are the 45 health outcomes that matter for this category. Pick yours, and the full evidence-ranked shelf loads for that goal alone.
Sarcopenia statusPresence of low muscle mass and function.80 rankedStrong
Infection durationLength of infectious illness episodes.55 rankedModerate-strong
Strength performanceMaximum or functional force production.28 rankedStrong
AlertnessWakefulness and readiness to respond.64 rankedStrong
Reaction timeSpeed of physical or cognitive response to a stimulus.38 rankedStrong
Perceived exertionSubjective difficulty of physical effort.22 rankedStrong
Infection incidenceOverall rate of infectious illness.56 rankedStrong
Intestinal permeabilityBarrier integrity and leakiness of the gut lining.34 rankedStrong
Muscle damage biomarkersMarkers such as creatine kinase indicating exercise-related tissue stress.88 rankedStrong
Attention and concentrationAbility to sustain and direct focus.68 rankedModerate-strong
Erectile functionAbility to achieve and maintain an erection.64 rankedModerate-strong
Endurance performanceAbility to maintain effort over a prolonged duration.86 rankedStrong
Power outputAbility to generate force rapidly.42 rankedStrong
Nitric oxide bioavailabilityAvailability of nitric oxide relevant to vascular function.67 rankedStrong
Skin elasticityAbility of skin to stretch and recoil.64 rankedStrongNothing is ranked yet — the shelf stays locked until you pick a goal.
No goal, no ranking.
A “best amino acid blends supplement” list without a goal would be marketing, not evidence. Pick what you want to improve and DoseRank scores all 168 products against that goal's trials.