Source Naturals Niacin, Vitamin B-3, Non-GMO, 100 mg - 250 Tablets

This one is actual fast-acting niacin, presumably nicotinic acid. It works smoothing-out my irregular heartbeat; have been using niacin for a few decades for this purpose. If considering niacin for health benefits, avoid "Niacinamide" formulations or the time-release products.This is definitely NOT medical advise. I only pass along my own experiences.

New Review (December 28, 2015)Still a 5 star product. Took this 2x a week for 5 months in doses as low as 50mg and as high as 600mg. Great flush. Vastly improved the circulation in my hands for cold weather rock climbing. I could feel the toxins leaving my body. Can feel a definite difference if I drank alcohol or other toxins the week I took this. This led me to a healthier lifestyle as I can feel the toxins leaving my body's fat cells. Overall circulation improved in my hands, face, shoulders, belly, knees, and thighs.Unfortunately it did not improve the circulation in my feet almost at all. :( or my ankles. Perhaps I have an underlying issue there I am not yet aware. And while I think this product helped prevent tendonitis in my hands/fingers when I pushed myself climbing. It did not seem to help much for shoulder and bicept tendonitis.Make sure you take a b-complex vitamin later in the week, eat whole veggies, and maybe a greens powder. Mega B3 doses will use up all your other B-vitamin reserves.Original Review (July 19, 2015)Great flush. Really dilates the capillaries on an empty stomach which is what I was going for. Kind of an intense and exhausting feeling though. Probably will only do it for 1 to 2 weeks instead of 3 months.

Helps you flush your system faster. It may not be a one day quick fix, but, there is no quick fix for THC besides synthetic urine, which is morally wrong as it's cheating and deceit. If you haven't smoked in awhile, it will get the THC out of your system super fast. Good tip, buy some at home drug tests, 50 cutoff level, and every day take 500 milligrams of this when you first wake up, don't eat anything, and go and work out hardcore. Drink a gallon of water over the 8 hour period after taking the pill. Make sure to piss a lot too. I did this and my at home tests went from positive to negative after 3 days. It will eventually flush your system completely clean if you use this. It CAN temporarily clean your system out. It gives you a 6 hour negative window starting 45 minutes after taking the pill. But be wary. If you smoked recently, it might not come negative on a test. Just. Make sure to use plenty of drug tests.

I have initially added low level Niacin to my substantial arsenal of longevity supplements that I take, which includes 750mg daily NMN, 1000mg trans-Resveratrol, 10mg DHEA, 2.5g Creatine, 1000-1500mg Berberine, and K2, methyl folate and methyl B12.It is very important to understand with all of the B vitamins especially that it can have harmful consequences taking very high levels for too long. This product is good because it is only 100mg but even that is 500% of the RDA. I therefore am breaking these in half and taking 50mg before ramping up to conceivably 300mg for 3-4 days a week and giving my body time off.The science is there that Niacin in this Nicotinic Acid form is an effective NAD+ precursor (less effective than NR or NMN but different effects and a fraction of the price. As such it seems to have the associated longevity benefits.My advice is to respect the dosage and certainly don't go taking very high doses like 1g+ daily for prolonged periods. I took my first doses as two half tablets and no flush, but this may be because I have been on NMN as well for the past year so my body is already used to NAD precursors. I did feel a surge in energy similar to NMN so that's a positive sign, and for anybody on a budget, this is a very valuable alternative as NMN is expensive (and unstable, needs to be kept chilled or in the freezer).

These are 100mg tablets. After reading Dr Sauls book, NIACIN The Real Story I am convinced that I should be taking this vitamin. I started with the 100mg tablet, 3x a day and noticed nothing. I'm now at 200mg, 3x a day and got the flush this morning. Now I understand what the flush is. The tingling starts at the very top of your head, moves down to your face/ears, then the heat starts in your face/ears and the tingling moves down to your neck. The tingling continues in your neck as it moves down to your arms along with the heat. It's a bit more than a hot flash ladies, so know the experience is comparable, but unique in its own way. The tingling goes away in about 5 minutes but the heat continues to linger for a while. I will continue on this regime until I notice no more FLUSH. The book indicates it may take a few days and also states that if I stop taking the Niacin at this dose, the flushing will occur again. I believe this is a genuine product and time will tell soon enough.

I've been using this product for about a month now and am definitely noticing results! I shopped around at local stores but couldn't find any that were in 100mg capsules, so I could start out with a low dosage. I found this one online and am very happy with it. The first day I started with 100 mg, but didn't get a flush. So the second day I increased it to 200 mg and got a flush, and now I take it 2-3 times a day. I notice if I don't eat enough solid food, the flush is very intense. After a good size meal, I hardly experience a flush at all. Sometimes the flush happens within 10 minutes, or up to 40 minutes. It is never consistent but I am happy when I feel it because then I know it's working. It has definitely helped my battle with depression. I first learned about it on the documentary Food Matters and was so hopeful to try it out. Now I'm referring it to others.