NutriStack
Activated Charcoal and NAC, a conflict.
Activated charcoal adsorbs NAC in the GI tract, rendering it ineffective. This is clinically important because NAC is the antidote for acetaminophen toxicity and charcoal can block its absorption.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Activated Charcoal and NAC
- Pair type
- Conflict
- Evidence (highest tier)
- Strong
- Source citations
- 3 sources
- Stack Score effect
- −10 to your Stack Score (per scored conflict row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Conflict · Strong evidence
Conflict
What is happening. Activated charcoal adsorbs NAC in the GI tract, rendering it ineffective. This is clinically important because NAC is the antidote for acetaminophen toxicity and charcoal can block its absorption.
Mechanism. Activated charcoal's massive surface area (1000-3500 m²/g) non-specifically adsorbs NAC through Van der Waals forces, preventing intestinal absorption. Can reduce NAC bioavailability by 50-70%.
Recommendation. Separate activated charcoal and NAC by at least 2 hours. If using NAC for clinical purposes, do not take activated charcoal at the same time.
Minimum separation. 120
Sources (3)
- Ekins BR et al. The effect of activated charcoal on N-acetylcysteine absorption in normal subjects. Am J Emerg Med. 1987;5(6):483-7. PMID 3663288
- Tenenbein PK et al. Interaction between N-acetylcysteine and activated charcoal: implications for the treatment of acetaminophen poisoning. Pharmacotherapy. 2001;21(11):1331-6. PMID 11714205
- Chyka PA et al. Position paper: Single-dose activated charcoal. Clin Toxicol (Phila). 2005;43(2):61-87. PMID 15822758
Stack Score
How this pair moves the number.
Effect on the composite score
If both Activated Charcoal and NAC are in the same stack, this pair applies −10 to your Stack Score (per scored conflict row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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