Clif Builder's Protein Bars are available in seven vegan flavors including Chocolate Mint, Chocolate Peanut Butter, Cookies and Cream, Crunchy Peanut Butter, Vanilla Almond, and Cinnamon Nut Swirl. ... If you have a true gluten allergy, Clif Builder's Vegan Protein Bars may not be an ideal option for you.