Since we have completely hijacked this thread. I have had some limited results with HTP-5. If you haven't already, it might be worth your while to research our gabba system, controls the bulk of our physical system and a chunk of our neurological system...
GABA receptor - Wikipedia, the free encyclopedia.
You could spend months of your time getting lost in some of this. Very interesting stuff!
I suppose when it affects ones work, it's worth trying all possibilities.
I used to work up to 16 hours per day and get plenty done without panicking to meet deadlines. Never stuck with a blank mind either. Sure I slowed down a little after my husband retired and as I've got a bit older, but not to the extent I have in the past months - it's been a very noticeable thing.
We do have some GABA capsules and also some 5HTP. My husband takes them at times if he gets stressed. I've not used either alone myself yet.
After my Dad died, I suddenly developed IBS, and none of the usual meds prescribed helped. Next step was tri-cyclic anti depressants to calm the digestive system ...not my cup of tea! I did some reading and found that three supplements could closely act in a similar fashion to the pharmaceutical drugs: L-Theanine, Taurine, GABA. All three are available in Theanine Serene, so I got some, and despite not expecting any success, found it to work extremely well!
Seeing I do take just one at night to keep symptoms at bay, I'm not sure any of those would help with my current concentration/focus issues.
I suppose I could try taking 2 per day just to see though, or could add the 5HTP (but I seem to recall it gave me headaches).
I was reading earlier about things like Tyrosine, GPC (Choline), & Tryptophan.
One thing I am feeling reasonably optimistic about though is that I do have some nootropics (Oxiracetam and Pramiracetam) - I only found out about them when looking for a solution to the problem a couple of months ago. It needs reading about as there's a number of different nootropics, and they are all slightly different. The two I have seem most likely to help with concentration and focus for 6-8 hours at a time with creative work. Probably best taken just 2 or 3 times per week.
I got a severe attack of positional vertigo just as I got them, so I haven't tried them yet properly. Not keen on taking anything until much better. Improving though, so will try them soon. The couple of times I have tried them, they did make a difference with no adverse effects.
It's obvious that not everyone gets these issues (thank goodness!), and those that do often find it resolving in a fairly short while. There does seem to be a percentage that have a longer lasting problem. I've encountered a few, and read of others who experience it too.