Enhanced liver detoxification
Supports liver function and protects against toxins
NAC (N-Acetyl-L-Cysteine)
Powerful antioxidant and glutathione precursor that supports liver detoxification, respiratory health, and cellular protection
Scientific nameN-Acetyl-L-cysteine
FormulaC5H9NO3S
Molecular weight163.19 g/mol
CAS616-91-1
70
absorption score
8
safety / 10
25
USD per month
5
documented interactions
Check it against something
NAC (N-Acetyl-L-Cysteine) with:
- Amylase
- Ashwagandha
- Avocado Oil
- BCAA (Branched-Chain Amino Acids)
- Beetroot Powder
- Beta-Alanine
- Bifidobacterium lactis
- Bifidobacterium longum
- Bovine Collagen
- Caffeine
- Calcium
- Calcium Bone Formula
- Calcium Carbonate
- Casein Protein
- Chicken Collagen
- Choline (Bitartrate)
- Chondroitin Sulfate
- Coconut Oil
- Collagen Peptides
- Comprehensive Immune Support Complex
- Comprehensive Multivitamin-Mineral Complex
- Creatine HCL
- Creatine Monohydrate
- D-Mannose
- DHA
- Electrolyte Blend
- EPA
- Fish Oil (EPA/DHA)
- Folate (5-MTHF)
- Ginger
- Iron Fumarate
- Iron Sulfate
- Joint Mobility Formula
- Keratin
- Krill Oil
- L-Carnitine
- L-Citrulline
- Lactase
- Lactobacillus acidophilus
- Lactobacillus rhamnosus
- Lipase
- Magnesium Citrate
- Magnesium Glycinate
- Magnesium Oxide
- Marine Collagen
- Melatonin
- Modafinil
- Olive Oil Extract
- Omega-3 + Curcumin + Vitamin D Triple Anti-Inflammatory Formula
- Papain
- Protease
- Saccharomyces boulardii
- Selenium (Thyroid Support)
- Turmeric
- Vitamin B12 (Cyanocobalamin)
- Vitamin B12 (Methylcobalamin)
- Vitamin C (Ascorbic Acid)
- Vitamin C (Sodium Ascorbate)
- Vitamin D3
- Whey Protein
- Zinc Gluconate
Nothing found
82
out of 100
Works better together
Compatible. Timing differs, so follow each supplement's own window.
What it does
mechanism and evidence for each claimRespiratory health support
Thins mucus and supports lung function
Powerful antioxidant protection
Protects cells from oxidative stress and free radical damage
Mental health and addiction support
May help with depression, anxiety, and addictive behaviors
Immune system enhancement
Supports immune function and reduces inflammation
Others take these for the same thing
Same goal, different mechanism — check any of them against this one
Turmeric
Anti-inflammatory & antioxidant
300-1000mg
A
3%
Glutathione
Master antioxidant & detox support
250-750mg
B
20%
Astaxanthin
Superior antioxidant & skin protection
4-12mg
B
20%
SAM-e
Mood support & liver health
400-800mg
A
70%
Plant Collagen
Vegan collagen support & antioxidants
2-5g
C
70%
Quercetin
Immune support & allergy relief
500-1000mg
B
5%
Every pair we checked
12 combinations scored by the engine
NAC (N-Acetyl-L-Cysteine) + Caffeine
No documented interaction either way
No known interaction
70
NAC (N-Acetyl-L-Cysteine) + Creatine Monohydrate
No documented interaction either way
No known interaction
70
NAC (N-Acetyl-L-Cysteine) + Calcium Carbonate
No documented interaction either way
No known interaction
70
NAC (N-Acetyl-L-Cysteine) + Whey Protein
No documented interaction either way
No known interaction
70
NAC (N-Acetyl-L-Cysteine) + Lactase
No documented interaction either way
No known interaction
70
NAC (N-Acetyl-L-Cysteine) + Bovine Collagen
No documented interaction either way
No known interaction
70
NAC (N-Acetyl-L-Cysteine) + DHA
No documented interaction either way
No known interaction
70
NAC (N-Acetyl-L-Cysteine) + Turmeric
No documented interaction either way
No known interaction
70
NAC (N-Acetyl-L-Cysteine) + Fish Oil (EPA/DHA)
No documented interaction either way
No known interaction
70
NAC (N-Acetyl-L-Cysteine) + Alpha-Lipoic Acid (ALA)
Enhanced antioxidant and detoxification effects
Works better together
78
NAC (N-Acetyl-L-Cysteine) + Vitamin D3
Enhanced antioxidant protection
Works better together
78
NAC (N-Acetyl-L-Cysteine) + Selenium (Thyroid Support)
Enhanced glutathione peroxidase activity
Works better together
82
Dosage
Daily600-1200mg
Liver detox600-1200mg daily
Respiratory support600-1200mg daily
Antioxidant support600-1800mg daily
Mental health1200-2400mg daily
When to expect it
First Effects1-2 weeks for respiratory and detox benefits
Peak Benefits4-8 weeks for sustained antioxidant and liver benefits
Deficiency DevelopmentGradual decline in glutathione levels
Toxicity OnsetRare, mainly digestive upset
How to measure it
MarkerGlutathione levels or liver enzymes (ALT, AST)
OptimalElevated glutathione, normal liver enzymes
Deficient belowLow glutathione levels
FrequencyEvery 3-6 months for liver health monitoring
What people actually reported to the FDA
CAERS, 179 reports naming it as the suspectMost reported effects
Named as the suspect
179 reports
of 192 that mention it at all
Serious outcome
88%
hospitalisation, emergency room or worse
Other Serious or Important Medical Event98
Hospitalization92
Visited a Health Care Provider34
Reports are voluntary and unverified — they record what someone experienced while taking something, not what the compound caused. Counts skew towards products people take a lot of, and a serious outcome is more likely to be reported than a mild one, so these are not rates. How we filter them →
What actually reaches you
The label counts the carrier, your body does not
Absorption
High 70 of 100 · absorbs well relative to other forms
Delivered daily
630 mg
Cost per 100 mg delivered
$0.13 comparative — uses the absorption score, not a measured percentage
Works better with
+
Selenium
Enhanced glutathione peroxidase activity
Selenium required for glutathione peroxidase enzyme function · level A
+
Alpha Lipoic Acid
Enhanced antioxidant and detoxification effects
Both support glutathione and liver detoxification · level B
+
Vitamin C
Enhanced antioxidant protection
Vitamin C regenerates glutathione and works synergistically · level BWhat not to take with NAC (N-Acetyl-L-Cysteine)
!
Alcohol Excess
Alcohol depletes glutathione and stresses liver
Alcohol metabolism consumes glutathione · major significance
!
Acetaminophen Overdose
High doses acetaminophen deplete glutathione dangerously
Acetaminophen metabolism depletes liver glutathione · critical significanceMedication interactions
Discuss these with a pharmacist before combiningMay enhance nitroglycerin effects
What to do: Monitor blood pressure and heart rate
Activated charcoal may reduce NAC absorption
What to do: Separate dosing by 2-4 hours
May enhance antibiotic effectiveness against biofilms
What to do: May improve treatment outcomes
Available forms
N-Acetyl-L-Cysteine Capsules/Powder: Proven benefits, FDA approved uses, Boosts glutathione, Liver support
Food sources
High-protein foods
Cysteine precursor in protein · 50
Chicken and turkey
High cysteine content · 55
Dairy products
Moderate cysteine content · 50
NAC supplements
600-1200mg per capsule · 70
Too little
- Poor detoxification capacity and liver dysfunction
- Thick mucus and respiratory problems
- Increased oxidative stress and cellular damage
- Poor immune function and frequent infections
- Slow recovery from illness or toxin exposure
- Mental health issues and mood disorders
- Heavy metal accumulation
Too much
- Generally safe but potential side effects:
- Nausea and digestive upset with high doses
- Vomiting with very high doses
- Sulfur taste and body odor
- Rare allergic reactions
Who benefits most
liver-detox-support
Excellent for liver health and detoxification support
600-1200mg daily
respiratory-lung-health
Effective for thinning mucus and supporting lung function
600-1200mg daily
antioxidant-glutathione-support
Most effective supplement for boosting glutathione levels
600-1800mg daily
mental-health-addiction
May help with depression, anxiety, and addictive behaviors
1200-2400mg daily
heavy-metal-detox
Helps chelate and remove heavy metals from body
600-1200mg dailyWhere to buy it
Look for NAC (N-Acetyl-L-Cysteine) at 600-1200mg per serving. The form that matters here is N-Acetyl-L-Cysteine Capsules/Powder.
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What else affects it
Beyond other supplements
!
Alcohol excess
Alcohol depletes glutathione and stresses liver
Alcohol metabolism consumes glutathioneHow it works
- Provides cysteine for glutathione synthesis - body's master antioxidant
- Breaks disulfide bonds in mucus proteins reducing viscosity
- Scavenges free radicals directly and through glutathione
- Supports phase II liver detoxification pathways
- Modulates glutamate neurotransmitter system in brain
- Chelates heavy metals facilitating their elimination
Key findings
what the evidence supports- Strong evidence for liver detoxification and acetaminophen poisoning
- Excellent for respiratory health and mucus reduction
- Most effective supplement for boosting glutathione levels
- Promising research for mental health and addiction support
Sources: NIH Examine.com · data reviewed 2026-08-02
Compiled by Denis, who maintains this database and holds no medical qualification — every figure here is sourced or derived, never asserted. How we calculate it →
Common questions
What are the benefits of NAC (N-Acetyl-L-Cysteine)?
Documented effects: Enhanced liver detoxification; Respiratory health support; Powerful antioxidant protection; Mental health and addiction support. Supports liver function and protects against toxins
How much NAC (N-Acetyl-L-Cysteine) should you take per day?
The common daily range is 600-1200mg. By goal — liver detox: 600-1200mg daily; respiratory support: 600-1200mg daily; antioxidant support: 600-1800mg daily; mental health: 1200-2400mg daily.
When is the best time to take NAC (N-Acetyl-L-Cysteine)?
Empty stomach or with food. First effects are typically reported within 1-2 weeks for respiratory and detox benefits.
What are the side effects of NAC (N-Acetyl-L-Cysteine)?
At excessive doses: Generally safe but potential side effects:, Nausea and digestive upset with high doses, Vomiting with very high doses, Sulfur taste and body odor, Rare allergic reactions. Safety rating at normal doses is 8 out of 10.
What should you not take with NAC (N-Acetyl-L-Cysteine)?
Separate it from Alcohol Excess, Acetaminophen Overdose by two to four hours. Alcohol depletes glutathione and stresses liver
Does NAC (N-Acetyl-L-Cysteine) interact with medications?
Documented interactions with nitroglycerin, activated-charcoal, antibiotics. Discuss these with a pharmacist before combining.
How do you know if you need NAC (N-Acetyl-L-Cysteine)?
The marker is Glutathione levels or liver enzymes (ALT, AST), optimal range Elevated glutathione, normal liver enzymes. Common deficiency signs: Poor detoxification capacity and liver dysfunction, Thick mucus and respiratory problems, Increased oxidative stress and cellular damage, Poor immune function and frequent infections.