What supplement will improve memory and concentration?

Hello. I'm a 25 year old man. For several years I have been noticing a lot of memory problems in myself. Not only when learning new things, but also in everyday life, in completely everyday activities. And I've had a huge problem with concentration since I was a child. And I still have. I would like to buy some supplements and try to work on my brain with them first. If these do not help, maybe I will try a visit to a specialist. But as for the question - I noticed that probably quite a good composition has DoppelHerz Aktiv For the Brain. I don't know, I just think this lineup is good. But magnesium is missing, and I read that magnesium supplementation is also important for the brain. So I would buy some magnesium, but probably every available magnesium is combined with vitamin b6. And this doppelherz aktiv also has b6 in it. And this is a dose of more than 100% of the daily requirement. Can I still take regularly and doppelherz and magnesium with b6? Alternatively, could you recommend me some other supplement that would be better (i.e. have more good vitamins, acids, etc.) for the brain?