LGD-4033.

Quick Overview.

LGD-4033, commonly known as Ligandrol, is a highly potent Selective Androgen Receptor Modulator (SARM) originally developed by Ligand Pharmaceuticals. It was created to treat conditions like muscle wasting and osteoporosis. In the fitness and bodybuilding communities, it is widely regarded as the premier SARM for adding sheer muscle mass and size.[1]

If Ostarine is the "beginner's SARM" used for cutting, Ligandrol is the "mass builder." It is significantly stronger than Ostarine and binds to the androgen receptor with extremely high affinity. Because of its potency, it produces rapid increases in muscle size and strength, but it also comes with a much higher degree of testosterone suppression and water retention.[2]

• Primary Use Case: Bulking, rapid increases in muscle mass, and significant strength gains.
• Mechanism: Highly selective, high-affinity agonism of the androgen receptor in skeletal muscle and bone.[3]
• Who it is for: Intermediate to advanced users looking to add significant size and strength without using traditional anabolic steroids.
• Who it is NOT for: Beginners, women (due to higher virilization risk compared to Ostarine), or anyone unwilling to run a proper Post Cycle Therapy (PCT).

The Protocol & Usage Guide.

confidence_tier: well-established

LGD-4033 is orally bioavailable and has a long half-life of approximately 24 to 36 hours, meaning it only needs to be dosed once per day.[4]

Standard Dosing Schedule

Cycle Length & Discontinuation Protocol

• Cycle Length: 8 weeks. Do not exceed 8 weeks. The gains typically plateau around week 6, while the side effects (suppression and liver stress) continue to compound.
• Discontinuation (PCT): LGD-4033 is highly suppressive. Even at doses as low as 1mg per day, clinical trials showed significant suppression of natural testosterone. A full Post Cycle Therapy (PCT) using Enclomiphene (12.5mg daily for 4 weeks) or Nolvadex (20mg daily for 4 weeks) is absolutely mandatory.[5]

Nutritional Support & Recommended Supplements.

confidence_tier: well-established

Safety, Interactions & Side Effect Management.

confidence_tier: well-established

Side Effect Profile

Contraindications

• Absolute: Individuals with pre-existing liver disease or severe cardiovascular issues.
• Absolute: Teenagers whose endocrine systems are still developing.
• Relative: Women, due to the higher risk of virilization (deepening of voice, hair growth) compared to milder SARMs.

Drug Interactions

• Alcohol: Severe. Combining oral SARMs with alcohol places immense stress on the liver.
• Accutane / Hepatotoxic Drugs: Severe. Do not stack with other liver-toxic medications.

Common Stacks & Combinations.

confidence_tier: community

Body Composition & Training Guide.

confidence_tier: community

• The Mass Builder: LGD-4033 is famous for rapid weight gain. It is common for users to gain 8-12 lbs on an 8-week cycle. However, users must understand that a significant portion of this weight is intracellular water and glycogen retention, not pure contractile tissue.
• The "LGD Pump": Because it causes the muscles to hold more water and glycogen, users report incredible, sometimes painful, muscle pumps during training.
• Post-Cycle Deflation: Because much of the initial size is water, users often feel they "lose their gains" post-cycle when the water sheds. The actual muscle tissue built will remain if PCT and training are maintained.

Storage, Handling & Accessibility.

confidence_tier: well-established

• Storage: Store liquid solutions or capsules at room temperature in a cool, dark place.
• WADA Status: Banned in competitive sports under section S1.2 (Other Anabolic Agents). It has a long detection window.
• Cost & Accessibility: Widely available from research chemical vendors. Typically costs $50-$70 for a 30mL bottle (usually dosed at 10mg/mL).

Bloodwork Monitoring Guide.

confidence_tier: well-established

Comparison to Similar Compounds.

confidence_tier: well-established

Deep Dive (For Advanced Researchers).

confidence_tier: well-established

Mechanism of Action

LGD-4033 is a non-steroidal, oral selective androgen receptor modulator. It binds to the androgen receptor with extremely high affinity (Ki of ~1 nM) and selectivity. It demonstrates anabolic activity in muscle, anti-resorptive and anabolic activity in bone, and robust selectivity for muscle versus prostate.[6]

Clinical Trial Summary

LGD-4033 has robust Phase I clinical data, making it one of the few SARMs with published human trials.

• The Basaria Study (2013): A placebo-controlled Phase I study evaluated the safety and tolerability of LGD-4033 in 76 healthy young men. Doses of 0.1, 0.3, and 1.0 mg were administered daily for 21 days. The study found a dose-dependent increase in lean body mass (up to 1.21 kg at 1.0 mg) in just 21 days.[7]
• Suppression Profile: The same study revealed profound suppression of the hypothalamic-pituitary-gonadal (HPG) axis. At just 1.0 mg per day, total testosterone dropped by roughly 50% from baseline, and sex hormone-binding globulin (SHBG) was significantly suppressed.[8]

Pharmacokinetics

LGD-4033 has a prolonged elimination half-life of 24 to 36 hours, which allows for once-daily dosing. It is cleared through both hepatic metabolism and renal excretion.[9]

Hepatotoxicity

While the 21-day Phase I trial at 1.0 mg showed no clinically significant changes in liver enzymes, the bodybuilding community uses doses 5x to 15x higher (5-15 mg) for much longer durations (8 weeks). At these doses, drug-induced liver injury (DILI) is a documented risk. Several case reports detail severe cholestatic liver injury and jaundice in young men using Ligandrol.[10][11]

Frequently Asked Questions (FAQ).

confidence_tier: community

Q: Do I really need a PCT for LGD-4033? A: Absolutely. LGD-4033 is highly suppressive. Clinical trials showed a 50% drop in testosterone at just 1mg/day. At bodybuilding doses (5-10mg), you will be heavily suppressed. A SERM PCT is mandatory.

Q: Why do I feel so tired on week 5 of my cycle? A: This is known as "SARM lethargy." It occurs because your natural testosterone has been suppressed, meaning your estrogen (which is made from testosterone) has also crashed. This is why many users now run a SERM (like Enclomiphene) alongside the SARM to keep a baseline level of testosterone and estrogen in the body.

Q: Is the weight gain permanent? A: No. A significant portion of the weight gained on LGD-4033 is intracellular water and glycogen. When you stop the drug, you will lose this water weight. However, the actual contractile muscle tissue built will remain if you PCT properly and continue training.

International Regulatory Status.

confidence_tier: well-established

Decision Tree.

confidence_tier: community

[Goal: Maximum Muscle Mass without Injectable Steroids?]
  |
  +-- Are you willing to run a full PCT and accept testosterone suppression?
        |
        +-- (No) -> Do not use LGD-4033. Stick to natural supplements.
        |
        +-- (Yes) -> LGD-4033 is the premier mass-building SARM.
              |
              +-- Take 5-10mg daily for 8 weeks.
              +-- Take Liver Support (NAC) daily.
              +-- Follow with 4 weeks of Enclomiphene or Nolvadex (PCT).

Schema.org Data.

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  "description": "A highly potent, non-steroidal selective androgen receptor modulator (SARM) investigated for muscle wasting, widely used off-label for rapid increases in muscle mass and strength.",
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    "description": "Investigational new drug. Not FDA approved. Banned by WADA."
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What we cited.