LGD-4033 and YK-11 Stack

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/* —- Brand palette (from STL brand sheet) —- */
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–c-lime:#91c72e;
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/* ———- BUTTONS ———- */
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/* ———- HIGHLIGHT CHIPS ———- */
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/* ———- SPEC CARD (tabbed) — light treatment ———- */
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font-size:.92rem;color:var(–c-mut);padding:11px 18px;border-radius:10px;transition:background .18s,color .18s;
flex:1 1 auto;min-width:120px;text-align:center}
.stl-spec__tab:hover{color:var(–c-logo)}
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.stl-spec__panel{padding:28px clamp(20px,3vw,34px) 34px}
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.stl-spec__table caption{text-align:left;font-weight:800;color:var(–c-logo);font-size:1.06rem;padding-bottom:16px}
.stl-spec__table th,.stl-spec__table td{text-align:left;padding:13px 4px;border-bottom:1px solid var(–c-line);vertical-align:top}
.stl-spec__table tr:last-child th,.stl-spec__table tr:last-child td{border-bottom:0}
.stl-spec__table th{width:38%;font-weight:700;color:var(–c-ink)}
.stl-spec__table td{color:var(–c-mut)}
.stl-spec__table tbody tr:hover{background:#f6faf8}
.stl-spec__table sub{font-size:.72em}
.stl-copy{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap}
.stl-copy__btn{appearance:none;border:1px solid var(–c-line);background:#fff;border-radius:7px;
cursor:pointer;font:inherit;font-size:.74rem;font-weight:700;color:var(–c-green);padding:3px 9px;transition:background .15s,border-color .15s}
.stl-copy__btn:hover{background:#f1f6f3;border-color:var(–c-green)}
.stl-copy__btn:focus-visible{outline:2px solid var(–c-green);outline-offset:1px}
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.stl-trust{display:grid;gap:13px}
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.stl-trust__ic{flex:0 0 auto;width:22px;height:22px;color:var(–c-green);margin-top:1px}
.stl-trust__row b{color:var(–c-logo)}
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.stl-pill{display:inline-block;background:var(–c-lime);color:#062021;font-size:.76rem;font-weight:800;padding:3px 11px;border-radius:999px;margin-left:8px;vertical-align:middle}
.stl-spec h3{color:var(–c-logo)}
.stl-spec .stl-sub{color:var(–c-mut);font-size:.92rem;margin:0 0 18px}
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.stl-spec a.stl-btn{margin-top:20px}
/* ———- COA IMAGE ———- */
.stl-coa{margin:6px 0 24px}
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.stl-coa figcaption{font-size:.84rem;color:var(–c-mut);margin-top:8px}
.stl-coa-head{display:flex;align-items:center;flex-wrap:wrap;margin:26px 0 10px}
.stl-coa-head h3{margin:0}
/* ———- QUALITY / EEAT ———- */
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.stl-stat b{display:block;font-size:1.7rem;font-weight:800;color:var(–c-lime);line-height:1}
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/* ———- COMPONENT (STACK) CARDS ———- */
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.stl-comp__card .eyebrow{margin-bottom:.4rem}
.stl-comp__card h3{margin:0 0 .5rem}
/* ———- REGULATORY BAND ———- */
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/* ———- REFERENCES ———- */
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/* ———- DISCLAIMER ———- */
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/* ———- NO-JS FALLBACK ———- */
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/* ———- READABILITY ———- */
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Why this bundle

Key highlights

Two-bottle research bundleOne 30 mL bottle each of LGD-4033 and YK-11, supplied together at a bundle discount. 10 mg/mL eachBoth bottles at 10 mg/mL (300 mg per bottle) with under 5% concentration variance. Independently verifiedEach compound is HPLC-tested by an accredited US third-party lab for purity and identity. Research use onlySupplied exclusively for laboratory investigation and development.

Technical data

LGD-403397.29% pure

YK-1199.04% pure

See all certificates of analysis

Why source this stack from Sports Technology Labs

Quality control across the research-compound industry is inconsistent, which makes third-party verification essential. A 2017 analysis published in JAMA examined 44 products marketed online as SARMs and reported wide gaps between labels and contents.

52%contained the labeled compound 39%contained an unapproved drug 25%contained an unlabeled substance 9%contained no active ingredient

Source: Van Wagoner et al., JAMA, 2017 (ref. 3).

Third-party tested & certified

Both compounds verified by MZ Biolabs (Tucson, AZ), an accredited US laboratory, via HPLC and mass spectrometry.

USP-grade PEG-400

Suspended in the highest grade carrier and bottled in America.

Glass bottles, fixed glass droppers

Prevents BPA leaching and avoids contamination from external tools.

60-day money-back guarantee

Transparent business, standard payment methods, no misrepresentation.

Research context

What is in this stack?

Component 1

LGD-4033 (Ligandrol)

A non-steroidal selective androgen receptor modulator (SARM). Mechanistically, it binds the androgen receptor with high affinity and tissue selectivity, distinguishing it from steroidal androgens. It was originally developed as an investigational compound by Ligand Pharmaceuticals (ref. 1).

Component 2

YK-11

A synthetic steroidal compound that acts as a partial agonist of the androgen receptor in vitro. It is commonly catalogued among SARMs and was first described in the research literature by Kanno et al. in 2011 (ref. 2).

Both compounds remain experimental research chemicals, supplied strictly for laboratory research. Sports Technology Labs makes no claims regarding their effects, and nothing in this listing should be interpreted as describing outcomes in humans or animals.

Regulatory & compliance status

Scientific references

1. Basaria S, et al. The safety, pharmacokinetics, and effects of LGD-4033, a novel nonsteroidal oral, selective androgen receptor modulator, in healthy young men. J Gerontol A Biol Sci Med Sci. 2013;68(1):87–95.
2. Kanno Y, Hikosaka R, Zhang SY, et al. (17α,20E)-17,20-[(1-methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna-4,20-diene-21-carboxylic acid methyl ester (YK-11) is a partial agonist of the androgen receptor. Biol Pharm Bull. 2011;34(3):318–323.
3. Van Wagoner RM, et al. Chemical composition and labeling of substances marketed as SARMs and sold via the internet. JAMA. 2017;318(20):2004–2010.
4. WADA Prohibited List (2025), Section S1: Anabolic Agents — Selective Androgen Receptor Modulators (SARMs). WADA.org.

Research use only. All products on this website are intended exclusively for laboratory research and development. They are not for human or animal consumption. These statements have not been evaluated by the U.S. Food and Drug Administration, and these products are not intended to diagnose, treat, cure, or prevent any disease.

Related standalone research products: liquid LGD-4033.