Some products in this list are recommended for certain symptoms. Some products might not work for others. Some products will work for you for a while but not for all symptoms. Some products may be effective but may not last forever. I've included links to the websites of several reputable sites to help you decide. You can also read testimonials from people who have used a product for a long time and how it worked for them. I've also included some products for more specific symptoms. For example, some may work on headaches, and some may not. Many of the products I've included have lots of other beneficial uses, but I have not listed them all because they aren't the most popular or well-known.
The answer depends on what your brain needs. If you want to be more efficient or have a longer focus span, you'll probably want to use something to boost your brain's brain power. If you need to be alert for long periods of time, you'll likely want to supplement with something to keep you alert and focused.
For example, you could use an all-natural brain boost such as a green tea extract or a supplement with caffeine.