Testimonials aren't very strong evidence, since they can be heavily filtered, which is why any third rate book or website can feature a list of impressive-looking testimonials even when 99% of people said "this is a pile of steaming crap, ignore it". A testimonial from gwern means much more to me then what a hundred cherry-picked PhDs say.
(That being said, it looks like a very good website, congrats)
As examine.com points out, creatine increases DHT production and may accelerate hair loss for men predisposed to baldness. This is the reason why I don't take creatine even though I do intensive weight lifting.
Potential. It's a possible logic link, but no actual evidence.
I think we have a different mental model of the sort of person who clicks on the link and investigates examine.com. My impression is that the average person with no particular health problems wants to know which supplements have the largest effect sizes, which doesn't exist all on one page on examine.com unfortunately.
Honestly, that is why the S-G Reference was created. It's to get to that info quickly and easily.
TL;DR: Supplements are mostly a waste
Exceptions I am aware of:
Everything else that shows a benefit turns out to have cohort issues IME. In other words only deficient people show a benefit. B12 or Vitamin C are good examples. I've been through much of examine.com and haven't found anything else worthwhile supplementing. if anyone spots anything feel free to post it.
Absolutely. Also of importance are zinc and vitamin K.
Still, what you've done is list supplements everyone should consider. The reality is that supplementation depends on contextual health goals, and that is where they shine.
A few simple examples:
Berberine and blood glucose Inositol and PCOS Bacopa and memory Rhodiola and fatigue (as James Miller mentioned) Feverfew and migraines
etc etc. Supplementation, when you apply it to contextual health goals, can be very powerful.
What's the quality of the guide?
My site, so obviously biased, but entire spectrum of health and wellness vouches for us: http://examine.com/testimonials/
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I was wondering why no fish oil, but examine.com finds rather little effect from it-- there's evidence it's good for lupus and for major depression, but it doesn't seem to do much for people in general.
If you eat enough fatty fish, you don't really need it.