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Serious Mass, Chocolate Peanut Butter, 6 lb, 8 Servings

Prices as of September 25, 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 25
  • 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 whey protein powder designed to support muscle building and weight gain. Each 2-scoop serving delivers 1,250 calories, 50 grams of protein, and over 250 grams of carbohydrates. It contains creatine monohydrate and glutamine to aid in muscle recovery, along with calcium, vitamin E, vitamin C, zinc, vitamin D, and 25 additional vitamins and minerals for immune support. This post-workout supplement is formulated for men and women seeking to increase caloric intake and promote lean mass development.

  • 1,250 calories per serving
  • 50 grams of protein
  • creatine monohydrate included
  • over 250g carbohydrates
  • immune-supporting vitamins
  • made in USA

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Serious Mass, Chocolate Peanut Butter, 6 lb, 8 Servings — Price History