Hey JayJuanGee / guys, I guess I will have to apologize a couple of times more in the future as I sometimes lack the time to respond in sufficient detail and then I decide to put the answer on ice for a moment altogether.
So to get back to the title of the thread, I think the aspect of "life-quality" can be investigated through self-experiments whereas longevity really is an answer that only research can give. I mean, once we are about to die, we probably won't have an idea whether a Niacin deficiency contributed to our death. There is a lot of research on the topic, some of which focuses on Niacin, but many of the studies focus on the vitamin B category as a whole.
The biggest problem in everyday lives is to clearly identify and isolate a (perceived) health problem, and then treat that problem while keeping the context in which the problem occurred otherwise intact.
So for example: a while ago I had been suffering from both nerve pain (wrist and shoulder) and psychological issues, I'd mention especially panic or stress as a baseline feeling over the course of the day. It's actually not easy to distinguish between anxiety, panic and stress. It seems to be easy at first glance, but it's not when these things occur at a rather moderate level, but still severe enough to impact your life. Now, there is certainly an interplay between physical impairment and psychological impairment. One may cause or foster the other and vice versa. Now let's proceed with the analysis:
There have been physical, tangible factors in my life that I could change to address the nerve pain. Change the load of my exercise, but also avoid certain activities that I know have had an impact on my nerves. That was pretty easy for me to identify. Certain activities that are (physically) nerve irritating and wrecking. I reduced or banned those activities and symptoms decreased, but didn't disappear. I then did more research on how to support nerves' recovery and health in general. And the answer is: B vitamins.
Now I'll be honest about individual B-substances, it is close to impossible without the assistance from a (highly professional) doctor and frequent measurement to exactly identify the one substance that will cure the one problem. Frankly, most of the problems are not caused by a single deficiency. Often times it is a question of balance and interplay. One of the best examples is vitamin D and magnesium. The latter is required to facilitate vitamin D absorption. Magnesium is like that gas in the Ethereum network here (to stay in line with the forum's motto
). If someone doesn't know that and uses overdosage of D3 (which I often do) without supplementing magnesium, it could cause problems. At the same time, vitamin D is the gas for calcium absorption and too much D3 can lead to hypercalcaemia. Either someone does sufficient research and does some experiments to find out what works and what actually has effects, or the only way to do something about the vitamin, mineral and hormonal balances is to consult very, very good doctors (and those are rare, at last from my experience).
Back to vitamin B: I have been trying to isolate single substances from the vitamin B complex, but this goes too far for me personally. You would really need bloodwork nonstop and then the interpretation of the numbers according to some standards is one thing, your mental and physical condition is another. The standards define huuuuge ranges and as soon as you are within these ranges, the doctor will tell you it's all good. But that is not the case! Testosterone and free testosterone is another great example for this. The range for "you are healthy" is so wide that everyone with an average IQ and some knowledge about the topic would know that the definition of the range itself is the error. And it is extremely individual! There are people who can perfectly live on the lower end of these ranges for some markers, but there are also people who feel like trash when their values are around the mean of these ranges.
I started using a vitamin B complex supplement of high quality and made sure that it contains the elements to support myelin nutrition and strength. The myelin cover is what protects your nerves. As soon as I took that for several weeks, my physical nerve problems were gone. This is now 6 years ago and I have rarely had any interruptions of supplementation.
BUT: at times, when I abused alcohol, nerve issues came back in an instant. Any of these substances (alcohol, drugs, nicotine, etc.), are fiercely attacking the myelin protection and go straight to the nerves. I then preventively took higher dosages of vitamin B complex when I knew I fucked up with my lifestyle and it turned out that this can be a cure to an (avoidable) problem. This is of course no recommendation to drink and just counter it with B vitamins
But there is clearly an effect of B vitamin supplementation in the physical realm against negative impacts on the body brought in externally. Therefore, I clearly recommend the supplementation of a high quality (doesn't have to be too expensive) vitamin B complex unless you perfectly understand how to choose the composition of your nutrition.
But there is still the mental health question: anxiety, panic, stress. In general, research has shown that the influence of our mind on our bodies, our health is clearly, clearly (!) statistically significant. There are very interesting documentaries about it and research published in the best medical journals available. Just read about the pla-cebo and no-cebo effects and how imagination and believe make a difference in physical recovery and health.
Now there is also the biochemical sphere, which can be influenced with supplementation. Cobalamin (B12) is probably the most important vitamin B that supports biochemical integrity and resilience. It is incredibly important for the brain (fatigue, brain fog, etc.) and this is something I have supplemented as an isolated substance on top for a while when I had these brain fog conditions. It depends on what B complex you can get and how the dosages within the complex are distributed. Keep in mind that the public recommendations can sometimes (or very often are) on the lower end of the spectrum.
To address anxiety, panic and stress conditions, I did some more research, banned alcohol and then later gave tryptophan a try. And now we'll come full circle regarding the name of the topic (Niacin, Glutamine). Ever since I started supplementing tryptophan, I have experienced that my mind far more often finds peace literally. One of the reasons is that tryptophan is the Ethereum gas for building Niacin (and others). Since alcohol is a Niacin killer and accelerates tryptophan depletion (a double negative), massive deficiencies are the consequence. I thought banning alcohol should therefore fix everything. I didn't drink anything for a few months and realized that I still feel far from perfect. That was the point when I introduced tryptophan. It helped! There are no miracles, but there are significant improvements over the status quo when deficiencies are present.
To get back to the initial question, I think you can see that upping the Niacin intake alone may lead to no effect at all. We have to understand our very own complex environment, what we do to our bodies, what our intake consists of and what the potential sources of harm/deficiencies are.
The good thing is that most of these supplements won't kill you and you can experiment with it. For me personally, a vitamin B complex with sufficient B12 dosage, tryptophan (before night) and magnesium, D3+K2 and creatine is my daily stack and I can say that it definitely does make a difference! That's 6 pills and a scoop of creatine per day. I do eat pretty healthy food and reduce alcohol to a minimum. My biggest issue is caffeine, which is of course a cortisol booster and bad for the nervous system (and actually not good at all in many other respects as well), but I accept that and can perfectly handle it with the way I set everything up now. I do have some variations according to life situations. If I know that I am going to have a weekend of partying, I increase some of the dosages. I understand enough of cause and effect and the substances to apply them under various circumstances.
Hope you are doing great and now I finally prepared a wall of text for you!
Looking forward to hearing from you.