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Serious Mass Weight Gainer Protein Powder

Prices as of September 26, 2026, as listed by each retailer — verify the current price on the retailer's site before purchase.

Price history tracked at Macy's price tracker

14-day low
$64.99
Sep 13 · Macy's
Best price
$64.99
−0% vs high
14-day high
$64.99
All stores
$65$65$65
Sep 13Sep 26
  • Macy's
Lowest in 14 days: $64.99 at Macy's. Highest: $64.99. Current best is 0% below the 14-day high.

About this product

Optimum Nutrition Serious Mass is a high-calorie protein powder supplement designed to support weight gain and muscle recovery. Each serving provides 1,250 calories and 50 grams of protein, making it suitable for use as a post-workout recovery drink. The formula includes over 250 grams of carbohydrates and is made with whey isolate. This weight gainer is intended for both men and women looking to increase calorie intake and support muscle growth during training.

  • 1,250 calories per serving
  • 50 grams of protein
  • whey isolate base
  • over 250g carbohydrates
  • made in USA
  • post-workout recovery

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Serious Mass Weight Gainer Protein Powder — Price History