Pen Peptide
Strength Stack | RAD140, OTR AC & Ligandrol (LGD-4033) - 230mg/3ml
Strength Stack | RAD140, OTR AC & Ligandrol (LGD-4033) - 230mg/3ml
Pre-Mixed Stabilized Pen
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- 🥇 The first peptide brand with Pre-Mixed Pen stabilized formulations
- 📦 We ship with DHL Express in thermo-insulated packaging
- 💳 Secure payment by card or bank transfer
- 🧪 Purity ≥98% for precise research protocols
✅ Proper storage
✅ Proper storage
To ensure the optimal quality of our products, we pay special attention to the delivery and storage of peptides. All our shipments are sent in special cooling boxes that maintain the required temperature during transportation. This guarantees that the products will reach you in perfect condition.
After receiving the peptides, it is important to store them properly to preserve their stability and effectiveness. We recommend storing them at a temperature between 2°C and 8°C in a refrigerator. This ensures that the peptides retain their properties throughout their shelf life.
✅ Order and Delivery
✅ Order and Delivery
At Pen Peptide, we ensure fast and secure delivery of your order with DHL Express, maintaining the highest quality and reliability throughout the process.
How we process your order:
Once your payment is confirmed via bank transfer or debit/credit card, we dispatch your order on the next business day.
Orders are carefully packaged in temperature-controlled cooling boxes to ensure product integrity during transportation.
Delivery timeframe:
Standard delivery time within the Europe & UK: 1 to 3 business days (typically 1-2 business days for most locations).
Deliveries are handled exclusively by DHL Express, providing a fast and reliable shipping experience.
Tracking & order confirmation:
After your payment has been successfully processed, you will receive an email confirmation with your tracking number.
You can use the provided tracking link to monitor your shipment’s progress and estimated delivery time.
With Pen Peptide, you can trust that your order will arrive quickly and in perfect condition, ensuring a seamless and efficient experience.
✅ How does the pen work?
✅ How does the pen work?
The peptide pen is an innovative and easy-to-use device, designed for precise dosing of the substance in research settings. It is a pre-mixed pen (Pre-Mixed Pen), which means it contains an already dissolved peptide in an optimal concentration, ready for use.
Key features of the pen:
- Precision – Each pen is pre-dosed, ensuring accurate and consistent application.
- Ease of Use – No dilution or additional preparation is required.
- Sterility and Safety – Each product is manufactured in controlled laboratory conditions and sterile-packaged to guarantee its purity and effectiveness.
How to use the pen?
- Attach the needle by placing it onto the pen and twisting until fully secured.
- Set the desired dose – use the dosage dial by rotating the regulator to the corresponding number, which represents the selected units. The numbers displayed range from 0 to 60, indicating the units for dosing.
- Administer the dose according to the requirements of your research.
- Store the pen properly – in a refrigerator at a temperature between 2°C and 8°C to maintain the stability of the peptide.
With the pre-mixed pen from Pen Peptide, the process is simplified, efficient, and safe, ensuring optimal results for your research.
✅ Why choose Pen Peptide?
✅ Why choose Pen Peptide?
If you are looking for peptides of the highest quality with over 98% purity, Pen Peptide is one of the best places where you can easily and securely order online. At Pen Peptide, we specialize in the synthesis of highly purified peptides intended exclusively for Research & Development Use Only.
Our peptides are produced in certified GMP laboratories, adhering to strict standards of quality, safety, and control. Each product undergoes rigorous testing for purity and stability to ensure you receive research materials with verified origin and maximum effectiveness.
We understand how important fast and reliable service is for our customers. That’s why we offer express delivery within 1 to 3 business days. All shipments are securely packaged to maintain product quality during transportation.
✅ Molecular Structure Stabilization Process Technology (MSSPT)
✅ Molecular Structure Stabilization Process Technology (MSSPT)
The Molecular Structure Stabilization Process Technology (MSSPT) focuses on preserving the structural integrity and functionality of molecules under harsh conditions and during prolonged storage periods. This process may involve modification of the molecule itself, optimization of storage conditions, or the use of auxiliary components that protect the molecules from degradation.

Key stages of the process:
1. Molecular modification:
Chemical and genetic engineering: Involves altering the structure or composition of the molecule to make it more resistant to degradation. For example, protein cross-linking can prevent unfolding, or modification can reduce susceptibility to chemical reactions.
Chemical modification: The introduction of protective groups or changes to reactive sites can prevent unwanted chemical reactions and degradation.
2. Optimization of storage conditions:
Lyophilization (freeze-drying): This method removes water from the sample, helping to preserve structure and prevent degradation during storage.
Storage in specialized containers: Using containers that protect from light and oxygen can safeguard molecules from photodegradation or oxidation.
Controlled-release systems: These systems provide a steady concentration of the therapeutic molecule, but introduce additional challenges related to stabilizing molecules over extended release periods.
3. Use of auxiliary components:
Buffers: Buffers help maintain stable pH levels, which are crucial for many chemical reactions and biological processes.
Antioxidants: These additives can prevent or reduce oxidative degradation, which is a common cause of molecular instability.
Stabilizing agents: These help prevent aggregation, precipitation, or other forms of degradation.
4. Understanding molecular interactions:
Thermodynamic equilibrium: A fundamental understanding of the interactions between a molecule and its environment is essential for developing effective stabilization strategies.
Detergents for membrane proteins: Specialized detergents, such as those developed to stabilize membrane proteins, help maintain their structure in solution.
Molecular simulations: Techniques such as molecular dynamics can provide valuable insights into the stability and behavior of molecules.
5. Examples of stabilization techniques:
Protein stabilization: Strategies include forming disulfide bonds, using stabilizing agents or chaperones, and introducing stabilizing mutations.
Polymer stabilization: Methods include the addition of antioxidants or the use of modified clay minerals that prevent polymer degradation.
Propellant stabilization: Stabilizers are essential to prevent the decomposition of propellants and ensure their safe and reliable performance.
Pen Peptide – Proven Molecular Stabilization
Our peptide pens are developed with a strong focus on preserving the biological activity and structural stability of the active compounds. Thanks to thoroughly researched stabilization processes—including optimization of storage environments and precise modification of molecular structure—we achieve long-term durability and reliability of the peptides under appropriate storage conditions.
The MSSPT (Molecule Structure Stabilization Process Technology) we use incorporates various approaches to maintain molecular integrity, including the use of suitable buffers, antioxidants, and stabilizing agents. The MSSPT technology allows for the integration of multiple active molecules into a compact volume without compromising their structural integrity or biological effectiveness. Additional optimization of storage conditions—such as pH control and prevention of photodegradation and oxidation—ensures maximum stability and bioactivity of the peptides.
These precise measures guarantee that the final product remains effective and stable even after extended storage periods, making it a secure and reliable option for use in various research protocols.
Pen Content: RAD-140 – 100mg, OTR-AC – 50mg, LGD-4033 – 80mg
What is the Strength Stack?
Strength Stack is a pre-formulated and stabilized pen containing three of the most popular and well-studied selective androgen receptor modulators (SARMs): RAD-140 (Testolone), LGD-4033 (Ligandrol), and OTR-AC – a modified analogue with enhanced selectivity. The combination is designed to achieve maximum anabolic effect in research protocols focused on muscle mass, strength, and recovery parameters.
Each pen contains a total of 230mg of active ingredients in 3ml, stabilized in a precise formula for subcutaneous use in scientific settings, ensuring high bioavailability and accurate dosage tracking.
Key Components and Mechanism of Action:
RAD-140 (Testolone) is one of the most potent selective androgen receptor modulators, demonstrating exceptionally high binding affinity to skeletal muscle tissue. It has been studied in laboratory settings for its ability to significantly stimulate protein synthesis, muscle fiber regeneration, and improvements in functional strength.What sets RAD-140 apart is its non-aromatizing nature and its lack of typical androgenic side effects, such as prostate enlargement or suppression of reproductive function, in protocols requiring selectivity. This makes it highly valuable in high-intensity protocols aimed at increasing muscle volume and accelerating recovery after physical exertion.
LGD-4033 (Ligandrol) is another well-researched SARM known for its strong anabolic activity even at low doses, with pronounced tissue selectivity. In research settings, LGD-4033 has shown potential to improve body composition, increase lean muscle mass, and preserve musculature during energy deficits or immobilization.The molecule has a favorable tolerability profile and is widely used in short-term cycles targeting high efficacy without inducing significant hormonal stress. When combined with RAD-140, its effects are complementary and considered synergistic due to the different receptor dynamics of both molecules.
OTR-AC is a newer compound in the SARM family, reported to have enhanced selectivity for androgen receptors in skeletal muscle and relatively low activity in estrogen-sensitive tissues. In research protocols, OTR-AC is used to promote dense, dry muscle mass and to help maintain muscle definition during deficit conditions. Thanks to its profile, it is a valuable component of this SARM Stack, contributing to a more aesthetic muscular result while complementing the effects of RAD-140 and LGD-4033.
Synergistic Effect of the Strength Stack:
Combining RAD-140 and LGD-4033 in a single formula delivers a complementary anabolic response, while OTR-AC enhances the impact on muscle definition and strength endurance. This three-component SARM Stack is particularly suitable for research cycles targeting hypertrophy, explosive strength, and accelerated recovery following intense physical stress.
The synergy among the components allows for lower individual dosages with enhanced effectiveness while maintaining control over potential side effects.
Scientifically Supported Potential Benefits:
The Strength Stack formula is designed to provide high anabolic efficiency with minimal hormonal burden. The combination of the three ingredients addresses key objectives in research protocols focused on strength, mass, and recovery.
- Supports the accumulation of lean muscle mass and strength capacity in short-term research cycles
- Promotes tissue recovery following physical exertion or periods of increased catabolism
- Maintains dense, structurally stable musculature with well-defined contours
- Contributes to improved endurance and muscle performance under high-intensity loads
- Maintains targeted receptor activity focused on skeletal muscle and bone tissue, without hormonal interference
- Suitable for advanced protocols aiming to optimize muscle response under high physical and metabolic demand
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.
For laboratory purposes and personal observation only.
The information has been collected from numerous studies and analyses conducted over the years and is not intended for diagnosing, treating, or preventing any diseases.
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