Optimum Nutrition Serious Mass Weight Gainer Protein Powder, Chocolate 12LB

Amazon/Walmart-style reviews for Optimum Nutrition Serious Mass Chocolate 12LB are mostly positive, with many customers praising the high calories, easy mixing, and effectiveness for weight gain. Several reviewers say it helps them gain pounds quickly, and some call the taste good or smooth. At the same time, a recurring complaint is that it can be very sweet, heavy, or cause bloating, and a few buyers dislike the sugar content or say the flavor is not for them.

On Target and Vitamin Shoppe, reviewers similarly describe it as a convenient way to boost calorie intake and support bulking, while some note digestive discomfort, excessive sweetness, or packaging/shipping issues. On Reddit, opinions are more mixed: some users report gaining weight, while others criticize the taste or describe it as unpleasant. A review blog also highlights bloating concerns but still considers it effective for mass gain.

For YouTube, the search results included real videos about this product, and the product-specific review videos appear to focus on taste, mixability, and weight-gain results.