








💥 Unlock steady energy and clean wellness with every tablet!
21st Century Niacin 500 mg Prolonged Release Tablets deliver a slow-release form of vitamin B3 designed to support energy metabolism, nervous system health, and skin function. With no added sugars, salts, yeast, preservatives, or artificial additives, these gluten-free tablets offer a clean, easy-to-digest supplement option trusted by thousands of adults seeking consistent quality and value.













| ASIN | B00HND5U3Y |
| Age Range Description | Adult |
| Allergen Information | Gluten Free |
| Best Sellers Rank | #52,559 in Health & Household ( See Top 100 in Health & Household ) #88 in Vitamin B3 (Niacin) Supplements |
| Brand | 21st Century |
| Brand Name | 21st Century |
| Color | No Color |
| Customer Reviews | 4.5 out of 5 stars 816 Reviews |
| Diet Type | Gluten Free |
| Dosage Form | Tablet |
| Flavor | Unflavored |
| Global Trade Identification Number | 00740985274743 |
| Item Dimensions | 1.75 x 2.38 x 3.75 inches |
| Item Form | Tablet |
| Item Weight | 0.21 Pounds |
| Manufacturer | 21st Century |
| Model Name | See packaging |
| Number of Items | 1 |
| Primary Supplement Type | Vitamin B3 |
| Product Benefits | Energy Management |
| Specific Uses For Product | Nerve |
| UPC | 740985274743 |
| Unit Count | 100 Count |
C**A
Good value that is easy to digest
Consistent quality and easily digested. Flush free and slow release formula is easy to swallow and meets Dr.’s requirements.
A**R
Good
I can't swallow big capsules & I couldn't find anything but capsules in the stores where I live so I ordered these. I can cut them up to take. I do get some flushing & a little itch but not too bad. I don't mind as it shows me it's working. The price is right for what you get & quality seems to be there consistently. Will definitely buy again.
C**L
Great product
In 3 months it lower my Triglycerides from 503 to 346 🤗 worth it
P**T
Not flush free
So the supplement is good but it’s not flush free. I don’t get the flush all the time but when I do it’s very uncomfortable! Red, hot, itchy skin all over! Because it’s bad when I get it I don’t know if I want to keep taking it. Good price tho.
K**E
My longtime go-to slo-niacin supplement for cholesterol control
I have been taking slo-niacin for years now. 21st Century is the same quality as the other name brand at a much more affordable price - and it's prolonged-release! All the niacin supplement brands claim that theirs is "no flush" - Believe me, there's no such thing. When I first started taking it, I'd flush all over my front upper body. Yes, others do notice. This has tapered off since I've been taking it so long. Nevertheless, I take it in the morning so that any flushing won't wake me up at night. I take it as part of my cholesterol control routine and can vouch for its effectiveness. I buy it with Subscribe & Save so that I never run out and don't have to remember to order each time it runs low.
W**Y
Y yo te quiero
Bien 👍
K**H
Causes hot flashes
I suppose that the product supplies the necessary nutrients but it causes my face to flush. This is a common side effect with niacin but I didn’t expect it with this product. It will not harm you but you can feel uncomfortable for a few minutes I will probably quit taking it
K**.
Too Early To Tell But...
I'm trying my best to replace my Statin since I had all the side effects but one. I had to stop taking it. I did a ton of reading on how to lower cholesterol and supposedly the slow release niacin is the ticket. Once in awhile I get flushing but usually not. Hoping it's working because I'll gladly take a little flushing over all those gnarly statin side effects. That said, I have not gone in for a blood test yet to see my cholesterol level. The quality seems great, the pills are a little big, but not giant or anything. They're not hard to swallow or anything. The price of this brand is extremely fair as well.
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