Description
What is the Lean Mass Stack?
Lean Mass Stack is a precisely formulated subcutaneous pen containing MK-677 (Ibutamoren) and LGD-4033 (Ligandrol) – two of the most commonly used compounds in research protocols aimed at increasing lean muscle mass, enhancing recovery, and providing metabolic support.
The formula includes a total of 160mg of active ingredients in 3ml, in a stabilized liquid form that ensures high bioavailability, effective absorption, and easy dosing in laboratory conditions.
Key Components and Mechanism of Action:
MK-677 (Ibutamoren) is a non-peptide ghrelin receptor agonist that stimulates the secretion of growth hormone (GH) and IGF-1 without directly affecting the androgenic axis. In research protocols, MK-677 has been used to support tissue regeneration, nitrogen retention, sleep quality, and recovery capacity, making it particularly valuable in long-term cycles for building lean mass and optimizing physiological restoration.
LGD-4033 (Ligandrol) is a highly selective androgen receptor modulator known for its high efficacy at low doses and favorable tolerability. The molecule binds to androgen receptors in skeletal muscle, stimulates protein synthesis, and helps preserve muscle tissue under stress or deficit conditions. LGD-4033 is widely used in short-term research protocols where a consistent and predictable anabolic response is desired.
Synergistic Effect of the Lean Mass Stack:
The combination of MK-677 and LGD-4033 offers a dual mechanism of action: LGD-4033 provides selective androgenic stimulation for muscle growth, while MK-677 supports endogenous regeneration and hormonal balance through GH and IGF-1. The synergy between the two molecules promotes long-term lean muscle development, accelerated recovery, and maintenance of metabolic stability.
This formula is well-suited for laboratory protocols focused on muscle building without fluid retention, minimal hormonal risk, and improved functional endurance.
Scientifically Supported Potential Benefits:
Lean Mass Stack provides a balanced approach between anabolic activation and hormonal support, making it effective in controlled research protocols focused on building high-quality muscle tissue.
- Supports sustainable gains in lean muscle mass
- Stimulates natural GH and IGF-1 secretion without androgenic interference
- Promotes recovery, sleep, and nitrogen balance
- Enhances strength capacity and structural muscle stability
- Minimizes muscle loss during catabolic conditions
- Suitable for systematic protocols with a stable impact on body composition
Dosage and Use in Research Protocols:
Recommended research protocol: 10 units once daily, for a duration of 4–8 weeks, followed by a rest period of 3–5 weeks.
Total pen content: 300 units
Maintaining optimal dosage and monitoring application duration play a crucial role in limiting the manifestation of side effects.
Possible Side Effects:
Currently, there is insufficient published clinical data regarding long-term usage profiles. In laboratory settings, tolerability is generally good, but as with any compound administered subcutaneously, individual reactions cannot be excluded.
Potential local effects related to the application method may include redness, sensitivity, discomfort, or mild swelling at the injection site. In longer cycles and higher doses, some models have explored possible effects on endogenous hormonal regulation, which may vary depending on dosage, duration, and individual sensitivity.
Strict monitoring of both dosage and duration is recommended for all research protocols.
For laboratory purposes and personal observation only.
