Our RAD-140 and RU-58841 stack includes one discounted 30 mL, 15 mg/mL bottle of RAD-140 and one discounted 30 mL, 50 mg/mL bottle of topical RU-58841. Save $10 when you buy RAD-140 and RU-58841 together in this exclusive bundle.
Key highlights
Product specifications
| Compound Class | Selective Androgen Receptor Modulator (SARM) · Non-steroidal |
|---|---|
| Concentration | 15 mg/mL |
| Composition | USP-grade PEG-400 base, RAD-140 (≥97% purity) |
| CAS Number | 1182367-47-0 |
| Chemical Formula | C20H16ClN5O2 |
| Molar Mass | 393.83 g/mol |
| Half-Life | ~44.7 hours |
| Synonyms | RAD-140, Testolone, RAD140 |
| Volume | 30 mL per bottle (450 mg total) |
| Verified Purity | Batch-tested to 97.5% (HPLC) |
| Compound Class | Non-steroidal Anti-androgen (NSAA) · Androgen Receptor Antagonist |
|---|---|
| Concentration | 50 mg/mL |
| Composition | USP-grade solvent base, RU-58841 (≥99% purity) |
| CAS Number | 154992-24-2 |
| Chemical Formula | C17H18F3N3O3 |
| Molar Mass | 369.3 g/mol |
| Synonyms | RU-58841, PSK-3841, HMR-3841 |
| Format | Topical liquid, spray applicator (~1/6 mL per pump) |
| Volume | 30 mL per bottle (1,500 mg total) |
| Verified Purity | Batch-tested to 99.31% (HPLC) |
For laboratory research use only. Not for human or animal consumption.
View certificates of analysisIndependently verified
Each compound in this bundle is analyzed by an accredited US third-party laboratory before it ships.
Purity and identity confirmed by MZ Biolabs (Tucson, AZ), a US DEA-licensed analytical facility, via HPLC purity analysis and mass-spectrometry identity confirmation under GLP standards.
Our third-party certificates of analysis are published on our website — no login required.
RAD-140 (Testolone)97.5% pure
RU-5884199.31% pure
Storage & handling
Both bottles are built to preserve compound integrity throughout your research timeline.
- Storage: Keep both bottles in a cool, dry place away from direct sunlight to maximize shelf life.
- UV-resistant glass bottles. RAD-140 ships with a fixed glass dropper and a graduated 1 mL glass pipette; RU-58841 ships with a topical spray applicator dispensing approximately 1/6 mL per pump.
- Tamper-proof seals to ensure integrity in transit.
- Handle as laboratory chemicals using appropriate personal protective equipment and standard lab practices.
- Evaporation-resistant formulation and packaging for stable storage.
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.
Source: Van Wagoner et al., JAMA, 2017 (ref. 3).
Both compounds verified by MZ Biolabs (Tucson, AZ), an accredited US laboratory, via HPLC and mass spectrometry.
Suspended in the highest grade solvents and bottled in America.
Bottled in glass to prevent leaching of plasticizers such as BPA.
Transparent business, standard payment methods, no misrepresentation.
What is in this stack?
RAD-140 (Testolone)
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 developed as an investigational compound by Radius Health, Inc. (ref. 1).
RU-58841 (topical)
A non-steroidal anti-androgen (NSAA) that acts as an antagonist of the androgen receptor. Mechanistically, it binds the androgen receptor and blocks androgen binding without reducing circulating androgen levels. It was first developed by French researchers (Roussel Uclaf) and is formulated for topical application in research contexts (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.
Important regulatory information
RAD-140 and RU-58841 are investigational compounds. They are not approved by the FDA and are not dietary supplements, drugs, or food. Marketing them for human use is unlawful.
RAD-140 is prohibited by the World Anti-Doping Agency under S1 (Anabolic Agents — SARMs), banned in- and out-of-competition. RU-58841, as a non-steroidal anti-androgen, is not listed on the WADA Prohibited List (ref. 4).
In the United States, neither is a controlled substance and both may be legally purchased and possessed for laboratory research use.
Sports Technology Labs are chemical suppliers, not medical providers. We do not condone or encourage consumer use of research compounds.
Scientific references
- Miller CP, et al. Design, synthesis, and preclinical characterization of the selective androgen receptor modulator (SARM) RAD140. ACS Med Chem Lett. 2011;2(2):124–129.
- National Center for Biotechnology Information. PubChem Compound Summary for RU-58841 (CAS 154992-24-2): molecular formula, molecular weight, and classification. PubChem, National Library of Medicine.
- 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.
- 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.
Why is Sports Technology Labs the best place to buy SARMs online?
A recent study involving chemical analyses of 44 different products sold and marketed as selective androgen receptor modulators on the internet revealed that quality control in this industry varies significantly from one company to the next.
Only 52% of the products tested contained the product advertised, 59% contained amounts that differed from the label, a shocking 39% contained other unapproved drugs, 25% contained substances not listed on the label, and 9% contained no active substance at all.
It is critical when performing research with SARMs to only purchase the highest quality, verified by third-party analysis.
If you are trying to figure out where to buy SARMs stacks, there appears to be no shortage of options out there. Sports Technology Labs is the best place to buy SARMs online because of their consistent, verifiable, high-quality products, safe bottling and packaging, fast shipping, and excellent customer service.
When you buy SARMs from Sports Technology Labs, you are choosing the highest quality ingredients. Minimum 98% pure compounds tested and certified by accredited American third-party labs, suspended in USP-grade (the highest grade) PEG-400, bottled in America.
Our products come in glass bottles with fixed glass droppers to prevent the leaching of unwanted plasticizers like BPA, and to avoid contamination when using external measuring tools.
We run a transparent business, with no discreet payment methods necessary and no misrepresentation of our products, only the highest quality research chemicals available online, secured by our 60-day money-back guarantee. For orders totaling $149 or more, we offer free shipping.
If you’re in a hurry to receive your products, we also provide express shipping options. Additionally, customers who sign up for our email list receive a 10% discount and an additional 10% off when paying with cryptocurrency.
At Sports Technology Labs, you can find SARMs for sale, including the highest quality RU58841 and RAD-140.
That’s why we are confident in our claim that we offer the best SARMs for sale on the market today. If you have any questions about our products, you can also contact us, and we’ll respond as soon as possible.
