NOW Supplements, NAC (N-Acetyl Cysteine) 600 mg with Selenium, 250 Veg Capsules
Original price was: $47.99.$22.99Current price is: $22.99.
Price: $47.99 - $22.99
(as of Jul 28, 2025 20:16:25 UTC – Details)
Maintains Cellular Health* With Selenium N-acetyl cysteine (NAC) is a stable form of the non-essential amino acid cysteine. It is a sulfur-containing amino acid that acts as a stabilizer for the formation of protein structures, and is also necessary for the formation of glutathione.* Selenium is an essential trace mineral that facilitates the production of several important enzymes.*
Is Discontinued By Manufacturer : No
Product Dimensions : 2.81 x 2.81 x 5.13 inches; 8.47 ounces
Item model number : 0086
Department : Health and Beauty>Health and Wellness
Date First Available : October 2, 2001
Manufacturer : NOW Sports – Nutrition and Wellness
ASIN : B0013OUQ3S
Country of Origin : USA
Best Sellers Rank: #1,530 in Health & Household (See Top 100 in Health & Household) #20 in Amino Acid Nutritional Supplements #217 in Sales & Deals
Customer Reviews: 4.6 4.6 out of 5 stars 13,557 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
With Selenium & Molybdenum
Maintains Cellular Health
Customers say
Customers find this supplement to be of excellent quality and appreciate its antioxidant properties, particularly for detoxification and immune function. Moreover, they consider it good value for money. However, experiences with nausea are mixed, with some reporting improved breathing while others experienced heartburn.
13 reviews for NOW Supplements, NAC (N-Acetyl Cysteine) 600 mg with Selenium, 250 Veg Capsules
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Original price was: $47.99.$22.99Current price is: $22.99.
Kevin James –
Supercharge your liver and say “goodbye” to hangovers…
*Overview*In a few words, I can say that this supplement is the closest supplement I’ve ever used to a miracle product. Why do I say that? As a precursor to glutathione (Coined âThe Mother of All Antioxidantsâ by Mark Hyman, MD), NAC serves to help my body overcome environmental and dietary toxins. In brief, I no longer feel “sluggish” like I once did or experience hangovers (even from minimal alcohol) like I once did. Since taking 1200-1800mg/day (2-3 capsules) in September of 2015, this has become a (long-awaited) staple in my supplement drawer and boost to my overall health. I am never without this product.*Dosage*I take, like I said, 2-3 capsules a day. First thing in the morning on an empty stomach with a large glass of water. Second one around lunchtime. Third one middle of the afternoon or so. If I plan on going out for a few drinks in the evening, I take another one before heading out the door to spend time with friends. I rarely miss doses but if I do, it is not as if my whole system crashes or I feel I have become so dependent on it I cannot function or am worse off than when I started.*What does it do?*If you’re interested in the breakdown of what exactly this product is meant to do, I would recommend your own research or read some of the other reviews. I merely want to offer my own experience. I have taken a variety of supplements since I was a teenager (15+ years) and never really felt that most products lived up the hype or could back up their claims. As a former smoker, I stumbled across this product while researching “What products help mitigate lung damage from smoking” and found this on a random forum buried somewhere in the text. That’s where I first encountered the name NAC. I was skeptical and more than a little nervous about taking it but was somewhat assured when I read this is used in hospitals for acetaminophen overdoses so, if used by the medical community, maybe there was something to it? The effect was initially subtle. I was bursting with energy or bouncing off walls but found certain things that used to be VERY hard for me started to lift.A few examples. I found myself picking up the phone more often and calling a friend where before I felt a dark lining on life that made it harder to be myself. I found myself breathing easier and experiencing less sinus pressure (which makes sense as this thins out mucus) which was hugely helpful as I am allergic to most everything and experience an overload. It didn’t take all allergy symptoms away, but my need for anti-allergy meds has decreased. In fact, I can’t remember the last time I bought a bottle of allegra. I found myself able to better focus in class and while I still experience a certain level of brain fog from time to time, clarity of thought is more the norm for me than the exception. This has corresponded to a lifting of a sense of depression and darkness making it easier to be myself in social situations (and move past the worst parts of social anxiety). Last, but certainly not least, I process alcohol WAY faster. I can’t explain the effect but, like most adults, I have a drink from time to time. Like some adults, I have nights where I have more than one drink from time to time. Unlike most adults after a night of drinking, I don’t have concerns for how I’ll feel the next day. I can feel the effect even at the bar where I remain lucid and focused while drinking as opposed to becoming…sloppy? In the last year I’ve woken up with a headache once as opposed to formerly experiencing a headache after 1 beer. So…it seems to be doing something…Like I said, I cannot recommend this product enough and continue to share my experience with everyone I encounter. While I continue to experiment with other supplements, adding or removing items for specific things, NAC remains a baseline of health for me and will not go without. No, my hair has not fallen out (as another reviewer mentioned they experienced). No, this product will not allow you to drink like a monster without effect at all. Qualifiers aside, this product might help you and would be worth considering if you’ve tried everything out there (like me) and want a good baseline for health to continue to build upon. Best of luck in your search for better health!*edited 10/06/16 for clarity.*
Taryn T. –
A Health Essential in Our Household
This supplement came highly recommended by our healthcare provider, and itâs become a daily must-have for our family. I appreciate the transparency and quality of the NOW brand. Since starting it, Iâve noticed a difference in my overall respiratory health and immune resilience. Capsules are easy to take and gentle on the stomach. Reliable, trustworthy, and effective.
Elise Cundy –
Taking care of my health
A friend suggested these and I’ve been taking them ever since.
Dexter –
When Your Supplement Decides to Decompose Before You Do
NOW Supplements, NAC (N-Acetyl Cysteine) 600 mg with Selenium, 250 Veg Capsules seem to develop dark spots on the surface showing a localized yellow-orange crystalline or oily substance, with a central dark brown or black spot. This is not evenly distributed, suggesting a localized reaction or contamination. The rest of the capsule appears intact and dry. This suggests oxidation of NAC or sulfur compound leakage, most likely due to a breach or micro-crack in the capsule shell, internal moisture exposure that initiated oxidation, or decomposition of NAC forming sulfur- or selenium-containing degradation products (brown/black). The color change around the site implies chemical migration â not mold, but chemical breakdown. The 2nd picture definitely shows a crystalline structure: Likely oxidized NAC, which can recrystallize when exposed to humidity or heat. Dark central burn-like core is not fungal (no mycelial structure), but suggests concentrated degradation, possibly from a hotspot of oxidation from a breach in capsule integrity allowing air/moisture to interact with the active ingredient. It’s a chemical breakdown, not biological growth. The bottle was kept closed, at room temperature in a kitchen cabinet, due to expire in 5/2028. NOW acknowledges that cosmetic changes like speckling may occur due to air exposure, and they consider this not harmful or quality-compromising, provided itâs minor and not accompanied by other signs of spoilage and the capsule is intact, and no strong odor or softening/leakage is present. My capsules have a distinct localized breakdown (yellow-orange material + blackened core) that goes beyond typical speckling â suggesting leakage, oxidation, or reaction. I think refrigerating the bottle with a desiccant packet would allow for a longer shelf life, and if true, NOW should probably say so on the bottle.
Eric Baldwin –
Good
Good
Roberto Lima Pro –
Good for your body and liver!
Best vitmin to your liver.. take also with silymarin and L-methyonine!
RoadReady –
This is a great supplement I use for lung, liver and brain health
NAC helps create and replenish glutathione, a great antioxidant which is indispensable for better health especially as it’s declines with age. I trust the “NOW” brand as a quality supplement for NAC (N-Acetyl Cysteine). Moisture can cause some brown dots or discoloration in the capsules (they’re still safe to take though) but keep the NAC capsules frozen for optimal freshness and this won’t occur.
Robyn Starveling –
Love It!
My daughter, a MA, recommended this supplement for general health and, anecdotally, I feel better taking it. This is a trusted brand though more expensive than other options. I will buy this again.
Carol F –
works well
Martini –
Iâve been using NAC 600 grms , for a number of yrs , I would recommend this product as itâs good value , easy to swallow.
Carol McKoy –
Great product, everything I am feeling a.little run down I take them to give my immune system a boost.
james harris –
reliable business and quality is great,
NAC –
Love this!