Everything DoseRank tracks on the nac shelf — N-Acetyl-L-Cysteine (NAC). The category itself is never ranked: 128 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 nac 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.
Respiratory symptom burdenOverall severity of breathing-related symptoms.110 rankedStrong
OvulationOccurrence and quality of ovulatory cycles.112 rankedModerate-strong
Liver functionOverall biochemical or clinical hepatic performance.110 rankedStrong
Inflammation biomarkersLaboratory measures of systemic or local inflammation.113 rankedModerate-strong
Antioxidant capacityMeasured ability to counter oxidative stress.118 rankedStrong
Aspartate aminotransferase (AST)Enzyme used to assess liver and muscle injury.7 rankedStrong
Depressive symptomsLow mood, anhedonia, and related depressive features.117 rankedModerate-strong
Nutrient deficiency correctionResolution of a documented vitamin, mineral, or nutrient deficiency.5 rankedStrong
Asthma controlDegree to which asthma symptoms and exacerbations are minimized.4 rankedLimited
Selenium statusBiochemical sufficiency of selenium.11 rankedStrong
Inflammatory bowel disease activityClinical or biochemical activity of IBD.3 rankedModerate-strong
C-reactive proteinAcute-phase inflammatory marker.14 rankedStrong
Thyroid functionOverall function of the thyroid axis.11 rankedStrong
Alanine aminotransferase (ALT)Liver enzyme used to assess hepatocellular injury.9 rankedStrong
Swelling or inflammationVisible or symptomatic tissue inflammation.4 rankedModerate-strongNothing is ranked yet — the shelf stays locked until you pick a goal.
No goal, no ranking.
A “best nac supplement” list without a goal would be marketing, not evidence. Pick what you want to improve and DoseRank scores all 128 products against that goal's trials.