Interesting, moomoo, interesting... Would you mind giving a quick run-down of what each of those in your main regime does for you?
Chziime
Rather than each one for a specific action for me it's more of a holistic thing (although the word makes me gag). I don't see the collection as a "stack", more of a regime. I'm looking to feel better, think better and have more energy.
The fish oil, lion's mane and brewer's yeast I use to stimulate NGF and keep my brain learning/growing. I feel the Gotu Kola helps me with motivation and energy and the Cordyceps helps my immune system be happy.
I also take Ginseng, a general multivitamin and make sure I'm getting enough choline (I generally have one raw egg a day as well as normal meals). I've ordered some Bacopa to try that out.
I see a lot of obsession on these boards with "300 mg of X means I need to take 143mcg of Y, but then only 75mg of Z" and perhaps it's a young-person thing to obsess over that. I don't think that it matters that much unless you're taking pharmaceuticals, the long discussion around dosing Methylene Blue makes perfect sense for example, but for supplements of the "health" type (rather than pharmaceutical type) I'm just better off taking simple, general doses and seeing what works.
I've used Deprenyl in the past and found it interesting, but as mentioned before I found DMAE (and Centroxophine) and Ashwangandha both "dulling" and made me emotionally flat.
Piracetam and Hydergine are definitely worth trying and they're the ones that got me into the whole nootropic thing 20 years ago.