NAC and Kidneys: Contrast Dye, CKD and Current Evidence
Does NAC protect the kidneys? The 2,308-patient ACT trial and a 2026 49-study meta-analysis are negative for routine oral contrast-nephropathy prevention.
Evidence library 47 analyses
NAC
Use this evidence hub to understand NAC: what it is, what human research shows, how dosing has been studied, and where safety or product claims remain uncertain.
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All NAC analysis
Browse every published guide, review and evidence update in this topic.
NAC FDA Status: Is N-Acetylcysteine Legal as a Supplement?
Is NAC banned or FDA-approved? Understand the U.S. drug-exclusion rule, 2022 enforcement-discretion guidance, 2025 warning-letter update and disease-claim limits.
NAC and ADHD: Why the Evidence Is Still Preliminary
Does NAC help ADHD? The main positive trial involved only adults with systemic lupus, not typical ADHD. See dose, attention results, mechanisms and evidence limits.
NAC and Autism: Irritability, Hyperactivity and Trial Evidence
Does NAC help autism? Compare the positive symptom-level meta-analysis with the negative 102-child six-month RCT, doses, irritability, hyperactivity and limitations.
NAC and Sleep: Insomnia, Sleep Apnea and Nighttime Claims
Does NAC help sleep? Review the small obstructive-sleep-apnea trial, insomnia evidence gap, nighttime timing, sleepiness and why NAC is not an established sleep supplement.
NAC for Weight Loss: What Randomized Human Trials Show
Does NAC help weight loss? Two randomized obesity trials found metabolic and adipose-tissue changes but no significant anthropometric weight-loss effect.
GlyNAC Dosage: What Human Trials Actually Used
What GlyNAC dose was studied? Compare 2.4, 4.8 and 7.2 g/day 1:1 regimens with the 100 mg/kg each glycine + NAC protocol used in older adults.
NAC for Exercise Performance and Recovery: Benefits, Dose and the Adaptation Question
Does NAC improve exercise performance or recovery? Review fatigue, soreness, glutathione, dose, pre-workout timing, bodybuilding claims and the antioxidant-adaptation question.
NAC and TUDCA: Can You Take Them Together?
NAC and TUDCA compared: how they differ, liver evidence, bile-acid pharmacology, acetaminophen treatment, stacking claims, timing and why synergy is unproven.