Optimum Nutrition

Optimum Nutrition Serious Mass Weight Gainer Protein Powder, Vanilla, 6LB | Weight Gainer Protein Powder, Mass Gainer with Whey Protein, Creatine, Glutamine, BCAAs, Vitamins & Minerals, Easy Mixing

Exclusive Prime price
$57.88
4K+ bought in past month
Last updated Oct 24, 2026 at 4:52am
Optimum Nutrition

About this product

About this item HIGH CALORIE WEIGHT GAINER: More than 1,200 calories per 2-scoop serving
50 grams of blended protein per 2-scoop serving
Over 250 grams of carbohydrates per 2-scoop serving
22 vitamins and minerals including Vitamin C, Vitamin D, and Zinc to provide immune support
With over 20 vitamins and minerals including Vitamin C and Zinc to provide immune support
MORE VERSATILITY: Using an electric blender, add fresh or frozen fruits, peanut butter, nuts, and other calorie dense foods to boost your weight gain potential

Editor's Take

Amazon-style retailer reviews are broadly positive, with shoppers praising the vanilla taste, value, and usefulness for gaining weight; some mention it mixes easily and can lead to noticeable weight gain. Walmart reviewers also describe it as tasty and effective, though a few note it can be very sweet or recommend using it carefully because of the calorie load.

Target reviews echo that it tastes good and supports weight gain, with multiple customers reporting visible progress and easy digestion. Vitamin Shoppe and iHerb reviews similarly describe it as a solid mass gainer for hard gainers, while one recurring caution across review sites is that it is high in calories and may be too sweet or heavy for some users.

On Reddit and fitness forums, the common theme for Serious Mass is that it works for bulking when paired with a calorie surplus, but users often warn that the serving size is large and can be filling or uncomfortable for some stomachs.

Search results also surfaced several YouTube reviews and demos specifically about this product, including videos titled Optimum Nutrition Serious Mass Weight Gainer Protein Powder Review, Optimum Nutrition Serious Mass Review | Mass Gainer Shake Breakdown, and Optimum Nutrition Serious Mass Review.

  • Positive themes: taste, price/value, weight gain support, easy mixing.
  • Common concerns: very sweet flavor, huge servings, possible stomach heaviness, high calorie count.

Price History

Specifications

Is Discontinued By Manufacturer Yes
Product Dimensions 6.14 x 6.14 x 9.76 inches; 1.98 Pounds
Item model number 1098370
Department unisex-adult
Date First Available September 21, 2004
Manufacturer Glanbia Performance Nutrition
ASIN B0015R6ZPQ
Best Sellers Rank #1,656 in Health & Household ( See Top 100 in Health & Household ) #2 in Sports Nutrition Weight Gainers #202 in Sales & Deals
Customer Reviews 4.5 4.5 out of 5 stars (18,795)

Videos