I am unmedicated with ADHD. Specifically for symptoms my go-to is lions mane mushroom supplements (I use "RealMushrooms", note that quality actually matters, and these have been consistent in my experience) and ginkgo biloba. Usually 500mg lions mane, 120mg ginkgo per dose. Lions mane sometimes a second dose later in the day, but it can be a little overstimulating. Ginkgo is recommended up to 3x a day.

It's been my go-to pairing for years, and it makes a noticeable difference, especially if I take a break from it.