Syn Pharma – Myosyn 10 – YK11

What is Myosin (YK-11) by SYN Pharma?

Myosin, also known by its research designation YK-11, is a synthetic compound categorized as a myostatin inhibitor and SARM-like agent. It was developed to enhance muscle growth by blocking myostatin—a protein that limits muscle development in the body. Unlike traditional SARMs, Myosin exhibits partial androgen receptor activity with potent anabolic effects, making it a popular choice for users seeking accelerated muscle gains.

Myosin is currently used in research environments to explore its potential in combating age-related muscle loss, sarcopenia, and physical wasting disorders. In performance applications, it is valued for producing dry, dense muscle gains with minimal water retention.

Myosin (YK-11) Benefits

Myosin may support the following outcomes when used correctly:

• Inhibits myostatin: allowing for increased muscle fiber growth and development;
• Promotes dry, lean gains: users typically experience dense, aesthetic muscle without bloating;
• Improves muscle hardness and strength: especially effective during cutting or recomposition cycles;
• Supports bone health: early studies suggest a positive effect on bone density and structure.

Unlike other SARMs, Myosin exhibits unique muscle-building properties due to its interaction with follistatin and downstream anabolic signaling.

Potential Side Effects

While promising, YK-11 is still experimental, and long-term effects are not fully documented. Reported side effects include:

• Testosterone suppression (often moderate to high);
• Mild joint discomfort or dryness;
• Increased liver enzymes at higher doses;
• Possible hair shedding in androgen-sensitive users.

It is recommended to use Myosin with proper cycle support and a post-cycle therapy (PCT) protocol to aid recovery.

Contraindications

Myosin is not suitable for individuals with the following pre-existing conditions:

• Hormone-sensitive cancers such as prostate or breast cancer;
• Liver dysfunction or elevated liver markers;
• Uncontrolled cardiovascular disease or hypertension.

Myosin Dosage

Effective daily dosage ranges from 5 mg to 15 mg per day, with a cycle length of 6–8 weeks. First-time users should begin with 5 mg/day to assess tolerance before increasing the dose. Due to its suppressive nature, users should plan for a full PCT following the cycle.

How to Take Myosin

Myosin should be taken once daily, preferably at the same time each day. It can be taken with or without food. For best absorption, some users choose to take it with a meal containing healthy fats.

Best Stacks with Myosin

Advanced Muscle Growth Stack

Common Questions About Myosin (YK-11)

Is Myosin (YK-11) a SARM or a steroid?

Myosin is not a true SARM or steroid. It is often categorized as a SARM-like compound but functions primarily as a myostatin inhibitor with selective androgenic activity. Its structure and behavior are unique among performance-enhancing compounds.

Can I stack Myosin with other SARMs?

Yes. Myosin is commonly stacked with LGD-4033, RAD-140, or MK-677 to maximize muscle development and recovery. However, stacking increases suppression, so a robust PCT is necessary.

Does Myosin cause water retention?

No. Myosin typically leads to dry, hard muscle gains with no associated water retention, making it ideal for users targeting physique improvements or contest prep.

Is post-cycle therapy required after using Myosin?

Yes. Due to its suppressive impact on natural testosterone production, a full PCT protocol using Nolvadex or Clomid is strongly recommended following any Myosin cycle.