Optimum Serious Mass

💥 1250+ kcal per serving — the caloric foundation for mass gain

Muscle mass and body weight gain require a sustained daily caloric surplus above maintenance — the fundamental prerequisite that no amount of training, protein or supplements can replace. For hard gainers, individuals with high metabolic rates or those who struggle with appetite, hitting 3500 to 5000+ kcal per day from solid food alone is genuinely difficult. One full serving of Serious Mass with water contributes over 1250 kcal — approximately 25 to 40% of a hard gainer's daily caloric target in a single 15-minute preparation and consumption window.

🥛 50g of protein — multi-source matrix for multi-phase amino acid delivery

The four-protein blend (whey protein concentrate, calcium caseinate, egg albumen, sweet dairy whey) creates a staggered absorption profile that no single protein source can replicate. Whey concentrate begins elevating plasma amino acids within 30 minutes of consumption. Sweet dairy whey extends the fast phase. Egg albumen provides an intermediate release. Calcium caseinate — the slowest-digesting dairy protein — continues releasing amino acids for 6 to 8 hours, providing sustained anti-catabolic protection through the recovery period. This multi-phase delivery is particularly valuable in a weight gainer consumed once or twice per day, where sustained amino acid availability between meals is critical.

🌾 251g of carbohydrates — EU-authorised muscle function recovery

Serious Mass provides 251g of carbohydrates per serving — directly enabling the EU-authorised health claim for carbohydrates and muscle function recovery: carbohydrates contribute to the recovery of normal muscle function after very intense exercise causing muscle fatigue and glycogen depletion, at a dose of 4g per kg body weight within the first 4 to 6 hours after exercise. For a 65kg athlete, 251g of carbohydrates from a single Serious Mass serving covers the full 260g carbohydrate target from this claim in one shake.

🔬 3g creatine monohydrate — built-in performance support

Serious Mass includes 3g of added creatine monohydrate per serving — the exact dose associated in research with increased physical performance during repeated high-intensity exercise bouts, and the dose at which the EU-authorised health claim for creatine and exercise performance applies. For athletes using Serious Mass daily, this eliminates the need for a separate creatine supplement during bulking phases.

💊 25 vitamins and minerals — complete micronutrient coverage per serving

The vitamin and mineral complex in Serious Mass covers 25 essential micronutrients including vitamins A, C, D, E, K, the full B-vitamin complex and key minerals. This comprehensive micronutrient matrix ensures that the dramatically elevated caloric intake of a mass phase does not create relative micronutrient insufficiencies — a common but frequently overlooked risk when caloric intake is rapidly increased without corresponding micronutrient supplementation.

🎯 Goal guide

🏋️ Mass gain (primary use case): 1 to 2 servings/day. Post-workout (full 2-scoop serving) and optionally between meals (1 scoop) under a structured progressive overload training programme. With milk instead of water for maximum caloric density.

🔥 Weight loss / cutting: not recommended. Serious Mass is specifically designed for caloric surplus phases and mass building — it is not a product for maintenance or cutting phases.

⚖️ Lean bulking: 1 serving/day post-workout with water rather than milk. Controlled caloric surplus approach for athletes seeking muscle mass gain with minimal fat accumulation.

Serving suggestion

Mix 2 heaped scoops (~334g) in 710ml of cold water. Shake, blend or stir until fully dissolved. For additional calories, use milk instead of water — replacing 710ml of water with low-fat milk adds approximately 350 kcal, bringing the total serving above 1600 kcal. New users are recommended to start with 1 scoop per day for the first week before progressing to the full 2-scoop serving.

Best times to enjoy it

🏋️ Immediately post-workout (primary recommendation)

The 30 to 60-minute post-workout window is when muscle insulin sensitivity, glycogen resynthesis rate and amino acid uptake are all at their highest. Consuming 1250+ kcal, 50g of protein and 251g of carbohydrates immediately post-workout maximises the anabolic stimulus and glycogen replenishment rate during the period of highest metabolic receptivity. ON explicitly lists post-workout consumption as the primary recommendation.

🕐 Between meals — caloric top-up during the day

For athletes who require 4000 to 5000+ kcal per day and cannot achieve this from solid food alone, a Serious Mass serving between lunch and dinner provides a significant caloric contribution in a format that requires minimal preparation and does not require a full meal's level of satiety and appetite. On rest days, between-meal consumption is the primary protocol — there is no post-workout window to target.

🌙 Before sleep — overnight recovery nutrition

A Serious Mass shake before sleep provides the multi-phase protein matrix with casein's 6 to 8-hour slow-release dimension directly aligned with the overnight fasting period and peak growth hormone secretion. The carbohydrate load from a pre-sleep serving is more controversial nutritionally, but for extreme hard gainers who need every caloric opportunity, it is a legitimate third daily serving option.

Breaking in protocol for new users

Full ingredient list (Chocolate)

Maltodextrin, protein blend (milk — whey protein concentrate, calcium caseinate, egg albumen, sweet dairy milk whey), cocoa powder (processed with alkali), natural and artificial flavourings, vitamin and mineral blend, creatine monohydrate, acesulfame potassium, lecithin (soy), medium chain triglycerides.

Full ingredient list (Vanilla)

Maltodextrin, protein blend (milk — whey protein concentrate, calcium caseinate, egg albumen, sweet dairy milk whey), natural and artificial flavourings, vitamin and mineral blend, creatine monohydrate, acesulfame potassium, lecithin (soy), medium chain triglycerides.

Key ingredient breakdown

Allergens

Contains: milk (whey, caseinate, sweet whey), egg (egg albumen), soy (lecithin). Chocolate variant contains cocoa. May contain traces of gluten and other allergens from the production facility. Not suitable for vegetarians (egg albumen is included — though not bovine collagen, strict vegetarians should note the egg component). Not suitable for vegans. Always refer to the current product label for the most up-to-date allergen information.

Product characteristics:

• 1250+ kcal per 2-scoop serving
• 50g of multi-source protein per serving
• 251g of carbohydrates per serving
• 3g added creatine monohydrate per serving
• 25 vitamins and minerals
• No added sugar (sweetened with acesulfame K)
• Contains MCTs

Nutritional values per serving — EU formula

Active supplement profile per serving

Formats disponibles

Caloric density comparison — with water vs with milk

Q1 — Who is Serious Mass designed for?

Serious Mass is specifically designed for three distinct profiles of individual. First, hard gainers — people with naturally high metabolic rates who burn calories rapidly and struggle to create the caloric surplus required for weight and muscle gain from food alone. Second, individuals with reduced appetite — those who cannot physically consume sufficient volume of food to achieve their caloric targets, whether due to digestive sensitivity, lifestyle constraints or personal preference. Third, athletes in structured mass phases — individuals who are intentionally maximising caloric intake alongside progressive overload training to build muscle mass as rapidly as possible. It is not designed for the general population, for individuals who are overweight, or for those in cutting or weight maintenance phases.

Q2 — Why does Serious Mass use maltodextrin as its primary carbohydrate rather than oats, sweet potato or other whole food sources?

Maltodextrin is a high-GI glucose polymer that produces a rapid blood glucose rise and a corresponding insulin spike — the precise carbohydrate profile most beneficial in the immediate post-workout window, where the combination of elevated insulin and depleted glycogen stores creates the optimal conditions for both glycogen resynthesis and amino acid uptake into muscle tissue. Whole food carbohydrate sources (oats, sweet potato) produce a lower, slower glycaemic response that is beneficial for general dietary use but is not optimised for the acute post-workout nutrient partitioning window. Serious Mass is a post-workout mass gainer, not a general dietary staple — the maltodextrin base is a deliberate formulation choice for this specific use context.

Q3 — Does the 3g of creatine in Serious Mass replace a dedicated creatine supplement?

For most users, yes. The EU-authorised health claim for creatine applies at 3g per day — the exact dose in each Serious Mass serving. Athletes consuming one full Serious Mass serving per day will receive 3g of creatine daily — sufficient to progressively saturate muscle creatine stores over 3 to 4 weeks of consistent use and maintain saturation thereafter. The only scenario where additional creatine supplementation might be considered is during an initial loading phase (20g/day for 5 to 7 days) — which cannot be achieved from Serious Mass alone. For the maintenance protocol (3g/day), Serious Mass is a complete creatine source.

Q4 — Can I mix Serious Mass with milk instead of water?

Yes — and this is explicitly suggested by ON for athletes who want to maximise caloric density. Replacing 710ml of water with low-fat milk adds approximately 350 kcal and additional protein (~25g) from the milk, pushing the total serving above 1600 kcal. For extreme hard gainers requiring 5000+ kcal per day, the milk-mixed protocol is the most calorie-efficient single-drink option available. Note that milk significantly increases the lactose load of the serving — individuals with lactose sensitivity should assess their tolerance with milk-mixed Serious Mass separately.

Q5 — Which format should I choose — 2730g or 5450g?

The formula and flavour are identical in both formats. The 2730g format (~8 servings) is appropriate for first-time users trialling a flavour or athletes using Serious Mass occasionally rather than daily. The 5450g format (~16 servings) provides a meaningfully lower cost per serving and is the standard format for athletes using Serious Mass as their primary daily caloric supplement — at one full serving per day, the 5450g format provides 16 days of supply; at two servings per day during intensive bulking phases, 8 days.

🍫 Recipe 1 — Chocolate Serious Mass ultimate mass shake

Time: 3 minutes

Ingredients (1 serving):

• 2 scoops (~334g) Serious Mass — Chocolate
• 400ml cold full-fat milk
• 300ml cold water
• 1 frozen banana
• 2 tbsp Life Pro Peanut Butter Smooth

Instructions:

1. Add milk, water, frozen banana and peanut butter to a blender.
2. Add 2 scoops of Serious Mass — Chocolate.
3. Blend on high for 20 to 30 seconds until completely smooth.
4. Consume immediately post-workout.
5. This combination provides approximately 1700 to 1800 kcal, 60 to 65g of protein and 270g+ of carbohydrates — the most calorie-dense post-workout shake available from straightforward ingredients.

Approximate macros: ~1750 kcal | ~270g carbs | ~25g fat | ~63g protein

🍦 Recipe 2 — Vanilla Serious Mass overnight mass oats

Time: 5 minutes + overnight rest

Ingredients (1 serving):

• 1 scoop (~167g) Serious Mass — Vanilla
• 250ml cold full-fat milk
• 100g rolled oats
• 1 tbsp Life Pro Peanut Butter Smooth
• Optional: fresh banana slices

Instructions:

1. Combine rolled oats and peanut butter in a large jar.
2. Add milk and 1 scoop of Serious Mass — Vanilla. Stir vigorously until fully combined.
3. Cover and refrigerate overnight (minimum 6 hours).
4. Top with fresh banana before eating.
5. This preparation provides approximately 1100 kcal and 40g of protein at breakfast — a sustained-release caloric meal using the Serious Mass as a flavouring and protein/calorie booster simultaneously.

Approximate macros: ~1100 kcal | ~175g carbs | ~15g fat | ~40g protein

🥤 Recipe 3 — Chocolate Serious Mass post-workout recovery super shake

Time: 3 minutes

Ingredients (1 serving):

• 2 scoops (~334g) Serious Mass — Chocolate
• 710ml cold water
• 1 scoop (31g) ON Gold Standard 100% Whey — Double Rich Chocolate
• Ice cubes

Instructions:

1. Add cold water and ice to a large shaker or blender.
2. Add 2 scoops of Serious Mass and 1 scoop of Gold Standard Whey.
3. Shake vigorously for 30 seconds or blend for 15 seconds.
4. Consume within 30 minutes of training.
5. Adding a Gold Standard scoop to Serious Mass boosts the protein content from 50g to 74g per serving — appropriate for very heavy athletes (90kg+) whose post-workout protein requirements exceed the standard Serious Mass serving's 50g.

Approximate macros: ~1380 kcal | ~253g carbs | ~7g fat | ~74g protein