How to Sell Vitamins. Part of the series: Nutrition Tips for Healthy Living. When selling vitamins, make sure that they are made of natural, not synthetic ingredients, since the natural variety will get better results, and choose products that work at a cellular level from a company that has been on the market for at least 20 years. Learn how to increase the odds of running a successful vitamin sales company with the sales tips in this free video on nutrition from a professional wellness counselor.