Everything DoseRank tracks on the amino acids shelf — L-Carnitine L-Tartrate. The category itself is never ranked: 2.2k 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.
A category alone does not say what you want the product to do. The same category can lead on sleep for one shopper and stress for another, and the evidence behind each pick differs. Picking the medical outcome first lets DoseRank rank this category's products against that outcome's studies and doses.
No. Dose-fit rewards landing inside the range studied for the outcome — over-dosing (common with melatonin) or under-dosing both lower the score. The goal is the effective dose, not the biggest number.
The Value score compares a product's price per serving with clinically relevant products ranked for the same outcome. A score of 50 is the typical price; above 50 means better value than typical, while below 50 means the product costs more than typical. It is a 0–100 value signal, not a percentile.
Cost is only one input. A cheap pick can trail on the composite when it uses a weaker form, misses the studied dose, or carries a stock-risk flag — the composite also weighs evidence, dose fit and availability.
Retailer links may be affiliate links and DoseRank may earn a commission. Rankings and placement are determined by the scoring model only — never by payment from a brand.
No. DoseRank summarizes evidence to help you choose; it is not a substitute for a clinician, especially if you are pregnant, breastfeeding, on medication, or managing a health condition.
Start with a goal, not a brand
Browsing amino acids 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.
Exercise recoveryReturn to baseline function after exertion.701 rankedStrong
Delayed-onset muscle sorenessPost-exercise muscle pain and stiffness.940 rankedModerate-strong
Muscle damage biomarkersMarkers such as creatine kinase indicating exercise-related tissue stress.619 rankedStrong
Sarcopenia statusPresence of low muscle mass and function.449 rankedStrong
Liver functionOverall biochemical or clinical hepatic performance.544 rankedStrong
Muscle massQuantity of skeletal muscle tissue.462 rankedStrong
Endurance performanceAbility to maintain effort over a prolonged duration.578 rankedStrong
Attention and concentrationAbility to sustain and direct focus.407 rankedModerate-strong
Intestinal permeabilityBarrier integrity and leakiness of the gut lining.283 rankedModerate-strong
Fat oxidationUse of fat as an energy source.368 rankedModerate-strong
Gut barrier functionIntegrity and protective function of intestinal lining.430 rankedModerate-strong
Sleep latencyTime needed to fall asleep.348 rankedStrong
FatiguePersistent tiredness, low stamina, or lack of energy.910 rankedStrong
Sleep qualityOverall restfulness and perceived quality of sleep.627 rankedStrong
Immune functionAbility of the immune system to respond appropriately.626 rankedStrongNothing is ranked yet — the shelf stays locked until you pick a goal.
No goal, no ranking.
A “best amino acids supplement” list without a goal would be marketing, not evidence. Pick what you want to improve and DoseRank scores all 2.2k products against that goal's trials.