Smoothie King co-founder Steve Kuhnaubegan mixing fruit, nutrients, and proteins in the late 1960s, in a successful attempt to assuage his own health conundrums. By 1973, he?d begun selling vitamins alongside his health-boosting concoctions, and soon, more than 600 Smoothie King locations were operating worldwide. Today, the shop?s patrons customize real apple, mango, and banana smoothies with sundry health-bolstering mix-ins. More than 70 blendable multi-vitamins, minerals, enzymes, nutrients, and amino acids fortify frosty smoothies, helping bodies to stay healthy or lift semi-trucks. Snacks such as veggie chips and high-protein cookies augment shakes in both health and deliciousness.