ProteinFactory® Lean Bulk Stack

Whey Isolate • Oatmuscle • Creapure® Creatine

Built for Lean Muscle Gains — Not Sugar Weight

Most mass gainers are disguised bags of sugar-loaded maltodextrin. Even the “clean” brands often use tapioca starch, a fast-digesting carb that spikes insulin almost like glucose. These formulas pack calories—but not quality.

The Lean Bulk Stack was engineered for lifters who want lean size, clean calories, and precise control over their macros.

This stack contains:

• Whey Isolate (ultra-clean, fast-digesting protein)

• Oatmuscle (whole-food, low-GI carbohydrate source)

• Creapure® Creatine (the purest creatine in the world)

Together, they deliver controlled caloric surplus, better nutrient partitioning, clean energy, and lean mass gain with minimal fat accumulation.

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Why This Stack Is Different — It’s All About the CARB Source

Most mass gainers rely on:

Maltodextrin (GI 105–135 — higher than sugar)
Dextrose
Tapioca starch disguised as “clean carbs”

These carbs digest extremely fast, causing:

• Fat storage

• Insulin spikes

• Energy crashes

• Bloating and water retention

Oatmuscle is the opposite.

✔ Low-GI, slow digesting

✔ Whole-food derived

✔ Steady glucose release

✔ Reduced fat gain

✔ Superior nutrient partitioning

You get clean calories that build muscle, not “mass gainer belly.”

This is what makes the Lean Bulk Stack completely different from the industry.

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STACK COMPONENT BREAKDOWN

1. Whey Isolate (Ultra-Clean Protein)

• High purity, low lactose

• Lightning-fast absorption

• Ideal for post-workout recovery

• Supports lean muscle growth without extra calories

2. Oatmuscle (Low-GI Clean Carbs)

• Whole-grain carbohydrates

• Zero maltodextrin, zero tapioca starch

• Slow energy release

• Helps maintain lean mass with reduced fat gain

• Perfect for lifters who want precision-controlled bulking

3. Creapure® Creatine Monohydrate

• The most clinically validated creatine

• Supports strength, hypertrophy, and endurance

• 99.9% pure—German manufactured

Product	Main Carb Source	Protein Source	Creatine Included	Clean Ingredients	GI Impact	Ideal User
ProteinFactory Lean Bulk Stack	Oatmuscle (whole-food, low GI)	Whey Isolate	Yes (Creapure®)	✔ No maltodextrin, no tapioca starch	Low GI → Lean gains	Lifters wanting clean lean mass
Optimum Nutrition Serious Mass	Maltodextrin	Whey, egg, dairy blend	No	❌ High sugar load	Very High GI	Bulkers who don’t mind fat gain
Naked Mass	Tapioca starch + maltodextrin	Whey + casein	No	❌ Fast-digesting carb blend	High GI	General mass gain
Transparent Labs Mass Gainer	Organic tapioca + sugars	Grass-fed whey	No	❌ Added sugars	High GI	Higher calorie bulkers

WHO THIS STACK IS FOR

• Lifters who want to gain size without gaining fat

• People with issues with lactose.  This is lactose free.

• Athletes wanting clean, steady energy

• Hardgainers needing quality calories

• Anyone sick of overpriced mass gainers filled with junk carbs

• Anyone wanting complete control over protein-to-carb ratios

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HOW TO USE

Whey Isolate: 1–2 scoops post-workout or between meals
Oatmuscle: 1–3 scoops added to shakes for clean calorie increase
Creapure: 3–5 grams daily

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LEAN BULK = LEAN MUSCLE

Every ingredient in this stack is chosen for one purpose:
Build muscle—not fat—through clean, controlled caloric surplus.

When your protein is clean…
When your creatine is pure…
When your CARBS are whole-food and low-GI…

You get leaner, harder, higher-quality gains than any commercial mass gainer can offer.