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Elite Stack 4 Products
MK677
RAD140

Bulking Bundle

Maximum Mass Building Stack

4.9 (63 reviews)

€200.00 €235.00 Save 15%

What’s Included

  • 1x YK-11 (Myostine) - 60 capsules
  • 1x Ligandrol (LGD4033) - 60 capsules
  • 1x Testolone (RAD140) - 60 capsules
  • 1x Ibutamoren (MK677) - 60 capsules

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Lab Tested

Lab Tested

Third-party verified

Fast Shipping

Fast Shipping

3-7 business days

24/7 Support

24/7 Support

Expert guidance

Product Description

The most powerful bulking stack available, combining the most potent muscle-building compounds for maximum mass gains. This elite stack includes YK11, Ligandrol, Testolone, and Ibutamoren, designed for serious athletes seeking extraordinary muscle growth.

Each product is manufactured to pharmaceutical standards and third-party tested for purity. This stack is reserved for experienced users who demand the ultimate in muscle-building potential and are ready for dramatic transformation.

63 reviews for Bulking Bundle

  1. admin-core-sarms-wp –

    Third-party tested and high quality. Exactly what I was looking for my fitness goals.

  2. Chen Wei –

    Great great

  3. Ryan Campbell –

    As a beginner, I approve.

  4. Jason P. –

    yyeyeyeye great

  5. George Wilkinson –

    The product is not fake and works: everything is fine. I don’t know why some people are hating.

  6. Matthew Hodgson –

    Works wonders

  7. Leon –

    If you need to bulk, then this is the real deal.

  8. Itai Ben David –

    If you need to bulk, then this is the real deal.

  9. James Whitaker –

    It works 5/5

  10. Oliver Bennett –

    Decent overall- no complains

  11. Benjamin Clarke –

    Good

  12. Jack Harrington –

    great customer service

  13. Thomas Fletcher –

    I like that there is no after taste.

  14. Ryan King –

    Ran the Bulking bundle With RAD-140 at 10mg, MK-677 at 10, LGD-4033 at 10 and YK-11 at 5 (since its strong). Strength kicked in surprisingly fast and MK-677 made me enjoy eating bigger portions. Honestly pumps from this bundle were crazy, no other sarm or stack made me look like that. But this stack definitely on the stronger side with some previous experience needed

  15. Edward Lawson –

    Fast delivery, overall good products, works well.

  16. Samuel Thornton –

    You guys are MVP

  17. Danielx B. –

    boy is getting big.. will post an update mn

  18. Eyal Shapira –

    Boys, I went from 53kg to 85kg in 4 months 4 MONTHS.

  19. Samuel Okoye –

    A read a lot of bad experiences here.. but I got my supplement delivered in 9 days to middle of nowhere. I am very saticefied

  20. Henry Collins –

    I was skeptical at first, but my order got sent the next day and even arrived only 6 days later in UK.

  21. Adam Scott –

    Ran the Bulking bundle With RAD-140 at 10mg, MK-677 at 10, LGD-4033 at 10 and YK-11 at 5 (since its strong). Strength kicked in surprisingly fast and MK-677 made me enjoy eating bigger portions. Honestly pumps from this bundle were crazy, no other sarm or stack made me look like that. But this stack definitely on the stronger side with some previous experience needed!

  22. Mirjam Saku –

    I bulked to the max!

  23. Blaine D. –

    Magical stuff!

  24. Claude Oliver –

    Tell me why would you NOT want to try this

  25. R. Emil –

    I finally look good for summer

  26. Odell Hal –

    10/10

  27. Braylen Granville –

    Great stuff

  28. Skyler Cale –

    Im love with this stack

  29. Buck Carey –

    Honestly really happy with this. Would buy again

  30. Bertolt Erwin –

    Good qualit, exactly what I wanted

  31. Roderick Colt –

    No issues at all. Solid experience. recommend!

  32. Brenden Dirk –

    good

  33. Indigo Keith –

    Im in love with this bundle

  34. Chandler Chad –

    This is the only thing that helped me bulk up

  35. Prince Lyle –

    Good

  36. Lockie Domenic –

    I really enjoyed this stack, picked up some good weigt with it

  37. Dennis Selby –

    Strong stack!!

  38. Ossie Richie –

    9.5/10

  39. Walter Mitchell –

    If you’re loking for a strong stack – this is it

  40. Cleo Hartman –

    Reviews are on point about this bundle

  41. Jayden Terrell –

    Finally – something I can gain weight with

  42. Zackary Donnelly –

    Took everything except MK-677. No complaints

  43. Laurie Read –

    Perfect for a good bulk

  44. Cliff Butler –

    YK11 was a bit too much for me in this stack

  45. Miles Waters –

    Good bundle

  46. Roberto Khan –

    Expected a bit more ngl

  47. Ahmed Cartwright –

    Im finally fat (in a good way), thanks to this bundle

  48. Nicolas Jackson –

    This was stronger than I expected, but for a experienced guy – gold

  49. Doug Howe –

    Most trustable brand I have tried yet

  50. Wilfred King –

    took this stack for 2 months and the results were crazy!

  51. Phoenix Holden –

    mk677 was the key in this bundle for my weight gain

  52. Byron Flores –

    Rad140 and Mk677 the best combo!!!

  53. Ramesh Lee –

    I really like the bottle design

  54. Clive Humphreys –

    I added cardarine for endurance and everything worked out perefectly

  55. Desmond Eastwood –

    This finally made me gain weight

  56. Adam Warner –

    well assembled bundle.

  57. Rajinder Crouch –

    Four weeks in and my whole frame looks different. gymbro thought i’d been at it for months lol

  58. Jeffery Hoyle –

    Never been able to eat enough to properly bulk but the appetite on this is something else entirely. finally hitting my calories every day and the size is just coming, best decision I made in a while

  59. Max Hough –

    Strength is climbing and I can see the size coming on slowly.

  60. Niall Swain –

    Genuinely did not expect to feel this stack as fast as I did. by week 2 the mk677 had my sleep dialed in completely and the yk11 and rad140 combo just hit like a truck. I am moving weight I was not moving 3 weeks ago and the fullness is unreal

  61. Bernard Sweeney –

    Scale is finally moving up! Exactly what I bought it for

  62. Simon Mercer –

    Appetite has been big

  63. Ashleigh Thornton –

    Exactly what a bulk should feel like

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What are the Key Benefits of SARMs Bulking Bundle?

Explosive muscle growth

Explosive muscle growth

Massive strength gains

Massive strength gains

Enhanced recovery

Enhanced recovery

Myostatin inhibition

Myostatin inhibition

Improved sleep quality

Improved sleep quality

Maximum muscle density

Maximum muscle density

Ingredients & Dosage

Active Ingredients

YK-11 (Myostine)

10mg per cap

Myostatin inhibition

Ligandrol (LGD4033)

10mg per cap

Lean muscle building

Testolone (RAD140)

10mg per cap

Strength and power

Ibutamoren (MK677)

10mg per cap

Growth hormone support

Purity & Quality

Third-party lab tested Third-party lab tested
99%+ purity guaranteed 99%+ purity guaranteed
24-month shelf life 24-month shelf life

How Does Bulking Bundle Work?

This stack represents the pinnacle of muscle-building supplementation, combining myostatin inhibition with powerful anabolic SARMs and growth hormone support. YK-11 removes genetic limitations on muscle growth, while Ligandrol and Testolone provide massive anabolic effects.

Ibutamoren supports the entire process through enhanced growth hormone release, improving recovery, sleep quality, and overall anabolic environment. The combination creates an unprecedented muscle-building effect that far exceeds natural limitations.

Users experience rapid muscle growth, dramatic strength increases, improved recovery, and substantial changes in physique within weeks of starting this stack.

Key Actions

1 Inhibits myostatin for unlimited growth
2 Maximizes anabolic pathways
3 Enhances natural growth hormone release

Quality Bulking Stack Available at CORE SARMS

Finding reliable bulking SARMs can be challenging, especially when product quality and transparency matter.

The bulking bundle includes carefully selected compounds that are independently tested for purity and quality. Every product is supplied with laboratory documentation, allowing you to verify exactly what you are purchasing. See the lab tests.

At CORE SARMS, we focus on delivering clean, accurately labelled compounds without unnecessary fillers. Our testing process provides confidence in product quality and transparency.

Explore our other muscle-building SARMs.

How to Use SARMs Bulking Bundle?

Dosage

Dosage

YK‑11: 10-20 mg — split into two 5-10 mg doses, MK‑677: 20 mg, RAD‑140: 20 mg, LGD‑4033: 10-20 mg

Timing

Timing

Morning: first dose of YK-11 + LGD-4033 + RAD-140 => Evening: Second dose of YK-11 => 30 to 60 minutes before bed: MK-677

Cycle Length

Cycle Length

6-8 weeks followed by a 4-week break

Important

Important

Dietary supplement use only

Important Notes

For experienced users only. Monitor response closely and consider PCT.

Bulking SARMs Bundle Guide

Goal

The main goal of the bulking SARMs bundle is supporting lean muscle growth, increased strength, and improved training performance.

Who Can Use This Bundle?

YK-11 is one of the most advanced SARMs. Therefore, this bundle should be chosen only by advanced SARMs users who have experience managing a potent stack and a relevant post-cycle therapy procedure.

How to Run?

Begin all compounds together and follow the recommended schedule consistently. Split YK-11 into separate doses – this helps maintain a more consistent routine throughout the day. After completing the cycle, allow adequate recovery time and follow an appropriate post-cycle approach.

Universal Rules for SARMs Stacking

  • Get your baseline done before starting, check again 2 weeks into the cycle, and do a final test 2 weeks after PCT finishes.
  • Use liver support, cholesterol aids, and electrolytes for the full duration.
  • After finishing any cycle or stack, take a complete break of at least 12 weeks before starting another. This gives your body time to fully reset.

How to Maximise the Potential Effects?

Training

Proper training is the key to gains. For this specific stack, focus on:

  • heavier compound movements,
  • lower-rep strength-focused sets,
  • adding accessory exercises to increase training volume,
  • allowing enough recovery time between sessions.

Include mobility work and proper warm-ups to support training quality and long-term performance.

Diet

Recommended guidelines:

  • Maintain a calorie surplus (400-600 calories) suited to your goals.
  • Take from 2.2 to 2.6 g of protein per kilogram of body weight daily.
  • Add omega-3s to your supplementation.
  • Eat regularly to support increased energy demands.

A consistent calorie surplus combined with effective training creates the ideal environment for muscle growth.

Looking for something else?

Is maintain lean muscle mass and strength during caloric restriction your primary goal? Explore Cutting Bundle available at CORE SARMS.

Frequently Asked Questions

The bundle includes YK-11 (Myostine), Ligandrol (LGD4033), Testolone (RAD140), and Ibutamoren (MK677) – the ultimate bulking stack.

Advanced users typically gain 9-13 kilograms of muscle during a 6-8 week cycle with this powerful stack.

No, this is an advanced stack for experienced users who have completed multiple SARM cycles and understand their response.

While generally well-tolerated when used responsibly, some users may experience mild effects such as increased appetite, water retention, or temporary fatigue. It’s important to follow recommended dosages and monitor your body’s response throughout the cycle.

Use a substantial caloric surplus with high protein intake (1.5g per lb bodyweight) to maximize the muscle-building potential.

Cycle length depends on individual goals, experience, and the compounds included. The typical cycle lasts 8-12 weeks. For your safety, do not exceed 12 weeks of consistent intake.

Yes, PCT is necessary when stacking SARMs, especially ones as potent as YK-11 included in this bulking bundle.

Start with smaller doses and observe how your body reacts to the compounds. Follow individual instructions provided with each product.

The compounds in the bundle can be combined with standard fitness supplements such as protein powders, vitamins, and other nutritional products. However, combining SARMs with other hormonal compounds is not recommended. If unsure, consult a qualified healthcare professional.

If you miss a dose, continue with your regular schedule when possible. Do not take an extra dose to compensate for the missing intake. The key is consistency.

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Customer Reviews

4.90 out of 5 (63 reviews)
Ashleigh Thornton
2026-06-28

Exactly what a bulk should feel like

Simon Mercer
2026-06-24

Appetite has been big

Bernard Sweeney
2026-06-18

Scale is finally moving up! Exactly what I bought it for

Write a Review


Bulking Bundle

Bulking Bundle

€200.00