As I got older, I've had more and more trouble focusing. I also started to suffer from confusion. The scariest part was when I was talking to someone about a technical subject, and suddenly what they were saying literally stopped having any meaning. I just couldn't understand a single word they were saying. I saw and heard them speaking, but didn't understand any of it. This lasted only a short time, but it happened a couple of times.

I then started taking DHA and CDP Choline, and all of the above symptoms went away. I was back to "normal". Through experimentation with stopping and restarting both DHA and CDP Choline, I figured out that it was the latter which was responsible for the change. There were days when I'd forget to take the CDP Choline and then later in the day notice that I felt I had trouble focusing and then realised, "oh yeah, I forgot to take the CDP". Starting to take it again would relieve the symptoms. This happened more than once. I also went for months without taking either supplement, where I'd run out and procrastinate on getting a refill, and sure enough, I'd go back to having trouble concentrating. Then I'd finally get a refill of CDP and I'd be able to focus well again. All of this has convinced me that CDP really is working for me.

Later, due to some other health issues (not related to cognition) that I've had, I took a good hard look at my diet, and found out that many health issues that I have and have had in the past could very likely be due to various vitamin and mineral deficiencies. Though I've always known that my diet wasn't really healthy, I never realized how much of a profound effect the lack of proper vitamins and minerals could have on my mental and physical health.

I started eating a lot more healthily (in particular, eating lots of fruits and vegetables, which were almost completely missing from my diet in the past), and taking supplements for some of the nutrients which I was still not getting adequate amounts of from my diet.

As a result, I feel much better, have a ton more energy, feel in a better mood, and have no problems concentrating.

I strongly encourage you to take a hard look at your diet to see if you're missing or low on any essential nutrients, and consider supplementing those (or, better yet, getting them through eating more nutritious food). It can really make a world of difference.