Optimum Nutrition Serious Mass Weight Gainer Protein Powder, Banana, 12LB | Weight Gainer Protein Powder, Mass Gainer with Whey Protein, Creatine, Glutamine, BCAAs, Vitamins & Minerals, Easy Mixing

Amazon-style marketplace reviews and retailer reviews for Optimum Nutrition Serious Mass Banana 12 lb are broadly positive, with many buyers saying it is effective for weight gain, offers good value, and mixes reasonably well. Retailer review pages for this banana flavor show strong average ratings, while some commenters note the flavor is very sweet or not their favorite compared with chocolate.

• Amazon-like and retailer reviewers commonly say it helps with bulking and hard-gainer routines.
• Walmart reviewers mention the banana 12 lb version has strong ratings and is popular for its calorie density and value.
• Muscle-and-strength style reviews praise the product for taste, mixability, and helping users gain weight quickly.
• Some forum-style feedback says the banana flavor can be too sweet, but still usable and effective.

YouTube search results include multiple real review videos about Serious Mass, including unboxing, taste test, and supplement review content. The most relevant videos found were centered on Serious Mass generally rather than specifically the banana flavor, but they are still directly about the product line.