Written by History in Effect - Top 5 reviewer - View all my reviews If you are looking for a protein bar on the go, look no further than an Optimum Nutrition Bar. Each bar contains about 20 grams of protein.The protein sources include fast protein like whey isolate and slower protein like calcium caseinate The taste is truly delicious and taste like a candy bar. The peanut butter just melted in my mouth as I bit down into The difference is that its nutritious. I consumed a whole back in like 6 days, because its that addictive. The perfect time to eat one is between meals, which means its basically your snack. So if your looking for a product that is easy on the wallet, great taste, and good ingredient profile..pick up a Lift Bar.