Deep-green, organic produce is the best choice for your green smoothies. If you're concerned about the “pricey” costs of organic produce from your local market, considering growing fruits and vegetables in your backyard garden is the easiest way to save money while also ensuring your ingredients haven't been contaminated by dangerous herbicides or pesticides. Organic produce doesn't expose you to the dangerous chemicals used in commercial agriculture, ensuring that you'll get maximum nutrients from the fruits and vegetables you use. If you don't have the time or space to grow your own, purchase locally or regionally grown organic produce in your local health food store, farmer's market, or supermarket.