Do I capitalize Vitamin D or vitamin d, ginseng or Ginseng..etc?

My research on this topic has convinced me that since the focus of treating ADHD is the management of its symptoms, alternative treatments such as changes in diet and nutritional supplements can provide an option for parents who are uncomfortable with prescription medication. Certain dietary changes have been said to alleviate ADHD symptoms. These changes can include the consumption of foods rich in magnesium, iron, vitamin d, vitamin b6, zinc, and omega-3 and 6 fatty acids. Nutritional supplements such as St. Johns Wort, ginseng, gingko biloba, and L-carnitine have also been said to help manage the symptoms of ADHD (Herbal Theutics Library).