PL: Haven't gone down the whole list of sites you suggested, so maybe this has been mentioned somewhere within.
Just adding this for whatever it may be worth, personal view only and noting what it can accomplish with athletes I have come incontact with. Pretty simple stuff to use by anyone, though quite a few have a misconception of how it may be used. Trying to keep this post simple and to the point, lot of biochemical factors involved which can become very boring, for me at least.
Nitrate Oxygen, Creatine and BCAA is an excellent blend for pre-training sessions, 30 to 45 minutes before . Taking the same blend, with Whey protein added, 30 to 45 minutes after a workout seems to double down on the recovery and muscle building affect. Taking Creatine with Whey Protein, (without NO, which can keep some from falling asleep..if not bothering you, that add to the Creatine) near or before bedtime also. With athletes (high school/college) who must put on 10 to 20lbs (along with a high protein/complex carb diet) , for their select event/sport in a matter of 3 to 6 weeks, find these supplements and the basic compound lifts are overwhelming helpful. I find this can happen over and over again with athletes.
Might as suggest taking the powder form of any supplement before a workout, rather than pills, etc. If taking in pill form, that crush them up quite a bit. Pre -loading, of a week or so, is usually not needed with these newer designed Creatine/NO products. Take Creatine/No/BCAA with water only. Recent studies have suggested that Creatine is helpful with regards to memory and/or brain neuron/impulse repair. Which would only be logical when considering it's affect of muscle nerve factors, in general. Actually Creatine seems to have a tonic affect on the whole body as well as a positive affect on aging and the elderly. Good Luck.
Side bar: Clinical research has suggester that NO blends may have a positive effect on male erection problems, allowing better flow through the blood vessels. Also the sperm count and health seems improved.