Everything DoseRank tracks on the amino acids shelf — N-Acetyl-L-Cysteine (NAC). The category itself is never ranked: 2.1k 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 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.
Liver functionOverall biochemical or clinical hepatic performance.610 rankedStrong
Muscle damage biomarkersMarkers such as creatine kinase indicating exercise-related tissue stress.630 rankedStrong
Sarcopenia statusPresence of low muscle mass and function.457 rankedStrong
Endurance performanceAbility to maintain effort over a prolonged duration.611 rankedStrong
Intestinal permeabilityBarrier integrity and leakiness of the gut lining.316 rankedStrong
Delayed-onset muscle sorenessPost-exercise muscle pain and stiffness.1k rankedModerate-strong
Exercise recoveryReturn to baseline function after exertion.834 rankedStrong
Attention and concentrationAbility to sustain and direct focus.431 rankedModerate-strong
Fat oxidationUse of fat as an energy source.524 rankedModerate-strong
Muscle massQuantity of skeletal muscle tissue.604 rankedStrong
Sleep latencyTime needed to fall asleep.363 rankedStrong
Infection durationLength of infectious illness episodes.279 rankedModerate-strong
AlertnessWakefulness and readiness to respond.271 rankedStrong
Infection incidenceOverall rate of infectious illness.286 rankedStrong
Nitric oxide bioavailabilityAvailability of nitric oxide relevant to vascular function.340 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 2.1k products against that goal's trials.