By Brian Berkovitz
The Active Times

We've all been there: It's a busy afternoon at the office and you've only got twenty minutes for lunch. You want something healthy and fast, and then you see it: The smoothie shop. In the realm of good nutrition, smoothies are always a safe bet ... right?

In a mixed-up world of calorie counting and muscle building, of antioxidants and vitamin concoctions, many smoothies mask unwelcome ingredients. We've come up with a list of six deceptive additions, as well as four others that will deliver the health and energy you're looking for.

For instance, did you know many protein powders can harbor harmful toxins, or that one popular milk-alternative could have harmful effects on your body? We'll also address some misconceptions. Is peanut butter good for you? And how do frozen fruits rank against their fresh counterparts?

Based on our research, we recommend you take a careful look at the ingredient lists at your favorite smoothie spots, and never be afraid to ask to see food labels.

For the complete slideshow of the good and bad of smoothie ingredients, go to TheActiveTimes.com.

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