The bark of a particular pine tree species (Pinus pinaster) contains compounds known to improve circulation, boost immune function, reduce inflammation, and prevent infections. Pine bark extract has many physical and mental effects, such as easing asthma symptoms, lowering cholesterol, and improving memory.
Some studies have shown that Pycnogenol, the brand name of maritime pine bark extract,  can benefit people with ADHD. In particular, pine bark extract reduces hyperactivity and inattentive episodes, though exactly how it works is unknown.
French maritime pine bark extract has few side effects, including dizziness and stomach upset. Adults can take up to 450 mg of maritime pine bark extract per day for up to one year for ADHD symptom relief.
These are the top three brands of French maritime pine bark extract.
Life Extension, Pycnogenol French Maritime Pine Bark Extract 100 mg
California Gold Nutrition French Maritime Pine Bark Extract 100 mg
Health Thru Nutrition Pycnogenol French Maritime Pine Bark 50 mg
One thing to know about French maritime pine bark extract is that it may increase nitric oxide production in the brain, which may enhance neural activity. One thing to care about is that French maritime pine bark extract has not been tested for safety in pregnant or breastfeeding women.
The cost of French maritime pine bark extract varies from brand to brand. It can cost as much as $48 for a 30-day supply, or $1.60 per day, or as little as $20 for a 60-day supply, or $0.33 per day.