1. Raise or save up the investment you'll need to start your vitamin business. For this venture type, the start-up costs are typically low and involve inventory, advertising and website costs.
2. Obtain a business license that allows you to establish your vitamin business and distribute your products to consumers. This also is necessary if you are purchasing items wholesale and selling them on a website. You can obtain a license by contacting your local county clerk's office to find out the necessary steps.
3. Register a domain name for your store and set up an online inventory. Host sites, such as Godaddy.com and Bluehost.com, provide ways to set up inventory, online shopping methods and secure payment programs.
4. Promote your business with vitamin distributors and establish relationships that allow you to regularly purchase items. Many distributors provide discounted rates to frequent customers who have shown good faith.
5. Advertise your business locally by visiting health clubs, gyms, spas and other locations that attract your target customers. Advertise online through health blogs, vitamin information websites and mass advertising programs, such as Google Adsense and Adwords.