Try "gotu kola" for brain enhancement. Take it with Korean ginseng, and Russian ginseng (which is really eleuthero), and eat a lot of fish and walnuts.
Those are great indeed, although only small fish which eat few or no other fish is recommended, because of high mercury levels in most seas. An example is salmon, which by itself is one of the healthiest things you can eat, but due to the mercury contamination it's only worth it if it's wild-caught from uncontaminated waters in Alaska. Mercury is one of the most damaging toxins, but it's a slow gradual easily unnoticeable damage spread over its long half-lives. Farmed salmon also has several other toxins such as pesticides, antibiotics, dioxins, PCBs: https://articles.mercola.com/sites/articles/archive/2018/03/24/why-farmed-salmon-are-toxic.aspx
Mercury is not a problem. Heavy metals can be expelled from the body by: EDTA, cilantro, sauna, and other ways. People often have high mercury content in their bodies from the fillings in their teeth.
Tooth fillings the way the dentists do them are not really all that natural. The mercury-silver amalgam is something that the body tries to remove, because the body naturally knows it is foreign and poisonous. So, over the years, the fillings break down slightly, thereby poisoning the body a little. The better one eats, the better his health gets, and the more capable the body is for getting rid of the mercury-silver amalgam by breaking it down, and the more it gets into his system.
Fish mercury is not a big problem.
