Choline is a supplement. You can buy it on amazon. http://www.amazon.co.uk/Solgar-Choline-Inositol-Vegetable-Capsules/dp/B000Z92FR2/ref=sr_1_3?ie=UTF8&qid=1458604460&sr=8-3&keywords=choline I would also recommend vitamin B1. It can really reduce stuttering on some people, but it only works on about 30 percent.