Optimum Nutrition Pro Complex Gainer, now marketed as Gold Standard Pro Gainer, is a high-calorie protein powder for people who struggle to eat enough to meet their calorie and protein goals.
- 650 calories per serving
- 60 g of protein per serving
- 3 g of added sugar
- 165 g serving
- 14 servings per 5 lb tub
Available in several flavors and sizes.





