[tomalaci]

Sure thing. You should always be aware of anecdotal evidence.

In my particular case when I did initial blood test, vitamin D was the only thing critically low. There were few other micronutrients that were just slightly low. I was prescribed high-dosage D-vitamin supplements and was told to touch some grass while out in the sun (computer screen time did not count). In just a month after doing that my overall noticeably improved.

After the wake-up call with vitamin D efficiency I paid more attention to my diet and also having some regular exercise. Improving combination of those gave me my next jump in health improvement. Afterwards, I started using few supplements such as L-theanine with my usual cup of coffee in the morning, I'd like to believe it has given me just a slight boost in focus but it could still just be plain old caffeine. However, I know that some people respond to it a lot stronger so there is certainly variation and is quite anecdotal.