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Optimum Nutrition

Serious Mass™, Chocolate Peanut Butter

Chocolate peanut butter · Whey Protein Concentrate · 340g serving

#336in Protein Powder(347)
Creatine✓ Vegetarian✓ Sugar-Free
1/2
XRay Score
8/100
Performance
P/kcal$P:F▾ CFb
At-a-Glance
50g
Protein /serving
4g
Fiber /serving
1250
kcal /serving
4.0g
Protein /100kcal
Performance
ProteinEfficiencyValue forMoneyLeannessLow CarbFiber
Where to Buy
iHerbBest value
6 lb · 8 servings
US$7.12/serving
US$56.99 for pack
Buy Now
Ships Worldwide
🇺🇸 Prices in USD
View more buying options

XRay Summary

  • Ranks #336 of 347 · XRay Score 8/100
  • Weakness: Low Carb (Bottom 99%)
  • Protein Source: Whey Concentrate
  • Flavor: Chocolate, Nutty, And Sweet

Serious Mass™, Chocolate Peanut Butter by Optimum Nutrition scores below most products in its category in the protein powder category with an XRay Score of 8/100, placing #336 out of 347. On the flip side, net carbs are on the higher end (bottom 99% of the category). It's built on whey concentrate, a widely used and cost-effective protein source. It comes in a chocolate, nutty, and sweet flavor profile.

How It Ranks

Ranked against 347 products in this category.

XRay Score5D weighted score across all dimensions
#336 of 347
8/100XRay Score
Protein Efficiencygrams of protein per 100 kcal — higher is better
#338 of 347
4.0g/100kcal50.0g/serving3rd percentile
Value for Moneygrams of protein per unit of currency — higher is better
#219 of 234
7.02 g/US$6th percentile
Leannessprotein-to-fat ratio — higher is better
#227 of 313
8.4:128th percentile
Low Carbnet carbs per 100g — lower is better
#226 of 229
72.3g/100g246.0g/serving1st percentile
Fiberfiber per 100g — higher is better
#138 of 141
1.2g/100g4.0g/serving2nd percentile

Leaderboard

XRay Score — Protein Powder (347 products)

RankProductProtein Eff.g/100kcalScore/100
#1
Impact Soy Protein (Unflavoured)
Impact Soy Protein (Unflavoured)
MyProtein
23.6g/100kcal98
···
#334
Gold Standard® Pro Gainer, Vanilla Custard
Gold Standard® Pro Gainer, Vanilla Custard
Optimum Nutrition
9.2g/100kcal10
#335
Balanced Meal™, Protein Powder, Chocolate
Balanced Meal™, Protein Powder, Chocolate
Animal
9.1g/100kcal10
#336
Serious Mass™, Chocolate Peanut Butter
Serious Mass™, Chocolate Peanut Butter
Optimum Nutrition
4.0g/100kcal8
#337
Serious Mass™, Chocolate
Serious Mass™, Chocolate
Optimum Nutrition
4.0g/100kcal8
#338
Sport, ALLMASS™, Advanced Muscle Gainer, Chocolate
Sport, ALLMASS™, Advanced Muscle Gainer, Chocolate
ALLMAX
3.3g/100kcal8
See all 347 ranked →

Performance

Visual comparison across the 5 dimensions and macronutrient split.

Radar

How this product compares on each dimension — overlaid on the category median (gray). Larger area is always better. Hover any label for raw values and formula.

ProteinEfficiencyValue forMoneyLeannessLow CarbFiber
This productAverage Protein Powder(n=347)
Learn more about our methodology →

Macro Split

1250kcal/serving
Protein
16%
Fat
4%
Carbs
80%

Nutrition

Macronutrient breakdown and product details.

NutrientPer Serving (340g)Per 100g
Energy1250kcal367.65kcal
Protein50g14.71g
Total Fat6g1.76g
Sat. Fat3.5g1.03g
Carbohydrates250g73.53g
Fiber4g1.18g
Sugar31g9.12g
Sodium820mg241.18mg

Shop

Best prices across retailers — shown in your selected currency.

ProductRetailerPricePer ServingShips to
6 lb2720g · 8 sv
Best Value
iHerb
Worldwide
US$56.99
US$7.12/sv
Buy Now
6 lb2720g · 8 servings
iHerb
Best Value
US$56.99
US$7.12/serving
Worldwide
Buy
Prices shown in each retailer's original currency. Shipping availability and delivery to your country depend on the retailer.

Disclaimer — All nutritional data and product information is provided to the best of our knowledge based on publicly available sources and may contain inaccuracies. MacroXray is not responsible for discrepancies between listed and actual product data. Nothing on this site constitutes medical, dietary, or nutritional advice. Always consult a qualified healthcare professional before making changes to your diet. Dietary restriction labels (e.g. gluten-free, vegan) are based on ingredient information and may not account for cross-contamination or manufacturing processes — always verify with the manufacturer if you have allergies or intolerances. Halal, Kosher and other certifications shown are based on product labeling or third party site descriptions; actual certification status may vary by region and should be confirmed with the certifying body or manufacturer. Prices shown are sourced from third-party retailers at the time of last scan and may have changed since then. MacroXray is not a retailer and does not sell products directly.

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Optimum Nutrition Serious Mass™, Chocolate Peanut Butter
Optimum NutritionSerious Mass™, Chocolate Peanut ButterProtein Powder · Chocolate, Nutty · Whey Concentrate · #336 of 347 Protein Powders
VegetarianSugar-Free
XRay Score
8/100
Weighted across
5 dimensions
Protein Efficiency4.0 g/100kcalValue for Money7.0 g/$Leanness8.4:1 P:FLow Carb72.3g net/100gFiber1.2 g/100g
This productProtein Powder avg
Nutrition
/ serving 340g/ 100g
Calories1250 kcal368 kcal
Protein50g15g
Fat6.0g1.8g
Carbs (total)250g74g
Fiber4.0g1.2g
Sugar31g9.1g
Macro Split
1250kcal/svg
Protein
16%
Fat
4%
Carbs
80%
Protein Powder Rankings
Value
Rank
Protein Efficiency
4.0 g/100kcal
#338/347
Value for Money
7.0 g/$
#219/234
Leanness
8.4:1 P:F
#227/313
Low Carb
72.3g net/100g
#226/229
Fiber
1.2 g/100g
#138/141
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Generated on Jun 14, 2026 bymacroxray.com
YOUR PROTEIN.YOUR RULES. RANKED.
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