NAKED Mass – Natural Weight Gainer Protein Powder – 8 LB Bulk, NSF Certified, GMO Free, Gluten Free & Soy Free. No Artificial Ingredients – 1,250 Calories per Serving

Customers find this protein powder effective for weight gain, with one reporting gaining 5 pounds of lean muscle mass. The product receives positive feedback for its clean ingredients, with one customer noting it contains only three organic and grass-fed ingredients, and its ease of mixing with various beverages. While some customers say it doesn't cause stomach issues, others report feeling nauseated for hours. Customers disagree on whether the product is worth the price.