Front label of Hero Nutrition Ultimate Mass Stack bottle – 60 caps formula for mass and power.
Supplement facts panel showing triple prohormone blend with 65 mg total actives per serving.

Hero Nutrition Ultimate Mass Stack – Triple-Action Prohormone for Size, Power & Density (60 Caps)

£73.00

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Hero Nutrition Ultimate Mass Stack is a powerful triple-prohormone blend formulated for serious athletes who want to take their lean muscle mass, strength, and definition to the next level. With three synergistic compounds—Estra-4,9-dien-3,17-dione, Methyl 1-Testosterone, and 2α,17α-dimethyl-5α-androst-3-one-17β-ol—this stack provides a comprehensive anabolic support system for hardcore bulking and recomposition phases.

This product is designed for experienced users who are prepared to follow a structured cycle with proper support. The combined effects target muscle hardness, size, and strength while helping to maintain a dry, aesthetically pleasing physique.

Ingredient Breakdown

Estra-4,9-dien-3,17-dion – 45 mg
A potent non-methylated prohormone known for promoting lean muscle growth and strength while supporting a hard, dry look. Estra-4,9-dien-3,17-dion may help suppress estrogen conversion during the cycle, further enhancing definition.

 Methyl 1-Testosterone – 10 mg
A highly anabolic compound included to support rapid strength increases and dense muscle growth. Its methylated structure increases bioavailability and delivers quick results for advanced lifters.

 2a,17a-dimethyl-5a-androst-3-one-17b-ol – 10 mg
A dry, hardening prohormone known for building lean muscle mass with minimal water retention. Works synergistically with the other two ingredients to enhance performance and visual physique.

 Who Is It For?

Ultimate Mass Stack is intended only for advanced users familiar with prohormone cycling and post-cycle therapy. It is ideal for:

  • Bodybuilders during lean bulk or recomposition phases

  • Strength athletes looking to break plateaus

  • Fitness competitors aiming for dry, dense muscle and a more defined look

This is a high-potency formula and is not suitable for beginners.

 Dosage – Timing – Follow-Up

Suggested Use:
Take one capsule daily with food.
Cycle duration: 4–5 weeks.

Cycle Support:

  • On-cycle support is strongly recommended due to the methylated components

  • Post-cycle therapy (PCT) is essential to help restore natural hormonal balance and preserve muscle gains