Ligandrol — Safety, Research, Risks & Legal Status

Not medical advice. Ligandrol is discussed here for informational and harm-reduction purposes only. We do not endorse use, and any dosing context is informational, not a protocol.

Also known as	LGD-4033, VK5211, anabolicum
Category	SARM
viking_therapeutics	Viking Therapeutics developed the compound further; VK5211 is the clinical continuation
potency	Among the most potent androgenically of early-generation SARMs
discontinued_reason	Development ceased before approval; marketed products are outside any regulatory framework
US legal status	Ligandrol is not approved by the FDA for any use, and it is illegal to market or sell it as a dietary supplement. The FDA has warned that SARMs are associated with serious risks including liver injury, heart attack, and stroke, and products are sold as research chemicals not for human consumption. It is prohibited at all times in sport under the WADA list.

What is Ligandrol?

Ligandrol (LGD-4033) is an investigational selective androgen receptor modulator developed to target androgen receptors in muscle and bone. It reached early human trials but was never approved for sale.

How it works

Ligandrol is a nonsteroidal androgen receptor agonist with selectivity for muscle and bone receptors. It demonstrates higher binding affinity and transcriptional activity in muscle-tissue androgen receptors compared to other tissues. The mechanism preferentially activates anabolic pathways in skeletal muscle while minimizing prostatic effects, though selectivity is incomplete.

Background & history

Ligandrol (LGD-4033) was developed by Ligand Pharmaceuticals and later partnered with Viking Therapeutics (VK5211). It entered Phase I and Phase II clinical trials for muscle wasting and age-related muscle loss in older adults. Development was discontinued before regulatory approval, though compounds in this class continue to be investigated in private research.

What the research says

Research suggests LGD-4033 increases lean body mass and has measurable androgenic activity, and a short healthy-volunteer study reported it was relatively well tolerated over a few weeks. There are no large or long-term human safety trials, and reported cases of drug-induced liver injury raise concern about real-world use.

Reported effects

Reported increases in lean muscle mass
Studied short-term gains in strength
Reported potency at low milligram amounts
Studied effects on body composition in early research
Reported bone-density improvements in preclinical studies
Studied suppression of fat mass in limited human data

Dosing & administration (informational)

In published clinical trials, doses ranged from 0.5 to 1.0 mg daily in healthy volunteers, with trials lasting 3-12 weeks. Some studies used higher doses in patient populations, but no safe or optimal human dose has been established for non-clinical use. Animal studies informed range-finding but did not establish therapeutic windows for humans.

This is general research/context information, not medical advice or a recommended protocol.

Safety & side effects

Reported to strongly suppress natural testosterone, with hormone levels staying low for weeks after stopping
Linked to reported cases of drug-induced liver injury, including jaundice and elevated liver enzymes
Can lower HDL cholesterol and worsen the lipid profile, affecting cardiovascular risk
Long-term human safety is unknown and the compound was never approved
Prohibited at all times in sport under the WADA list
May cause suppression of follicle-stimulating hormone and luteinizing hormone

Drug & supplement interactions

May compound suppression of testosterone if used with other androgenic compounds or steroids
Potential to interact with oral anticoagulants given effects on liver metabolism
Risk of additive hepatotoxicity if combined with other known hepatotoxic substances
May amplify lipid abnormalities if used with other agents affecting cholesterol
Limited data on interactions with endocrine medications or hormone-sensitive compounds

Who should avoid it

Avoid in individuals with pre-existing liver disease or elevated baseline liver enzymes
Avoid if at high personal or family risk for prostate cancer or cardiovascular events
Avoid concurrent use with other SARMs, anabolic steroids, or androgenic compounds
Avoid in those planning assisted reproduction, as androgen suppression impacts fertility
Avoid if subject to drug testing in sport or other regulatory contexts

How it is commonly combined

Ligandrol is frequently stacked with other compounds in unregulated communities, but such combinations have not been studied and substantially amplify risks of hormonal collapse, hepatotoxicity, and cardiovascular stress. No evidence-based stacks exist and all multi-compound use is experimental and dangerous.

Legal & regulatory. Ligandrol is not approved by the FDA for any use, and it is illegal to market or sell it as a dietary supplement. The FDA has warned that SARMs are associated with serious risks including liver injury, heart attack, and stroke, and products are sold as research chemicals not for human consumption. It is prohibited at all times in sport under the WADA list.

Quality & harm reduction

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Lab testing & harm-reduction tools

If you are going to research a compound, verifying identity and purity is the single most protective step. Independent analytical testing and sterile-handling supplies reduce risk.

Compare testing options

Frequently asked questions

Does ligandrol require post-cycle therapy?

People use it expecting suppression, but we do not give protocols. Testosterone suppression is a real risk, and recovery should be discussed with a clinician.

What dose is safe?

We do not provide human dosing guidance. Ligandrol is unapproved and any use should involve a qualified clinician.

Has ligandrol caused liver problems?

Yes. There are published case reports of drug-induced liver injury associated with LGD-4033 use, including cholestatic injury.

How long does recovery take after ligandrol?

Recovery of natural testosterone can take weeks to months; some users report persistent suppression. Individual variation is significant and clinician monitoring is essential.

Is ligandrol more powerful than ostarine?

In studies, ligandrol shows stronger androgenic activity and suppression at equivalent durations, making it higher-risk, not higher-safety.

References & further reading

PubMed: ligandrol LGD-4033 lean muscle mass clinical trial
PubMed: LGD-4033 testosterone suppression androgen receptor selectivity
FDA warning on SARMs and unapproved muscle-building compounds
WADA Prohibited List: selective androgen receptor modulators
ClinicalTrials.gov: LGD-4033 muscle wasting older adults