S-23 for Sale: 99% Pure S-23 SARM 20mg Capsules
Searching for S-23 for sale from a supplier that proves its quality? Chemyo offers this compound in precise 20mg capsules, with 60 capsules in every bottle. An independent laboratory tests each batch to 99% purity. In addition, we publish the certificate of analysis before any order leaves our facility.
Careful research needs carefully made material. For that reason, we focus on verified purity, exact strength and open documentation. You always know what each capsule contains. You can also read the lab report for your own batch. As a result, your records stay complete and your work stays repeatable.
Below, you will find a clear overview of S-23 and its research history. You will also learn how we test it, how to store it and how to buy S-23 online in a few quick steps.
At a glance: S-23, 20mg per capsule, 60 capsules per bottle, 99% purity, third-party HPLC tested, batch-matched COA. Sold strictly for laboratory research use.
What Is S-23?
S-23 is a non-steroidal selective androgen receptor modulator, or SARM. You may also see it written as S23. Some suppliers call it Mastorin. All of these names refer to the same compound.
GTx, Inc. developed S-23 together with academic researchers in the 2000s. The same team was behind Ostarine and Andarine. As a result, S-23 shares much of its chemistry with those better-known compounds.
The Aryl-Propionamide Family
S-23 belongs to the aryl-propionamide family of SARMs. Ostarine and Andarine are also members of this family. However, small changes to its structure give S-23 a distinct binding profile. In the published literature, it is described as having a high binding affinity for the androgen receptor. For this reason, it is a useful compound for structure-activity research within the family.
How Does S-23 Compare to Other SARMs?
Researchers often compare S-23 with its close relatives, Ostarine and Andarine. They also compare it with compounds from other chemical series, such as LGD-4033 and RAD-140. These comparisons help scientists understand how structure shapes receptor activity. You can view related products in our full range of SARMs for sale.
S-23 Research Background
All published research on S-23 comes from preclinical studies. The sections below summarize the main areas scientists have explored. This overview is for background only. It does not suggest any use outside the laboratory.
Receptor Binding Studies
First, early work measured how S-23 binds to the androgen receptor. Researchers compared it with other aryl-propionamide compounds in cell-based assays. These studies placed it among the higher-affinity members of the family. They also guided the animal research that followed.
Male Hormonal Contraception Research
Next, the best-known S-23 study was published in the journal Endocrinology in 2009. Researchers examined S-23 as a possible male hormonal contraceptive in rats. In that model, they reported a dose-dependent suppression of sperm production. Notably, they also reported that this effect reversed after treatment stopped. This study remains the core of the S-23 research record.
Tissue Selectivity Research
In addition, the same body of work looked at tissue selectivity. Researchers compared androgen receptor activity across several tissues in their animal model. These results helped define the compound’s overall preclinical profile.
Limits of the Current Evidence
Finally, it is important to be clear about what is not known. S-23 has never completed a clinical trial, and there is no published controlled human data on it. It is not approved by the FDA for any use. Its known effects on the hormone system in animals are another reason for caution. Meanwhile, published case reports describe liver injury in people who used SARMs outside of clinical studies. For all these reasons, S-23 belongs only in controlled research settings.
To read the original papers, search PubMed for “S-23 SARM” or “S-23 contraception”. Because the literature is small, reviewing every primary source is both practical and worthwhile.
Why Buy S-23 from Chemyo?
Many websites list S-23 for sale. Yet independent tests of the SARM market have found serious quality gaps. Some products hold far less compound than their labels claim. Others contain a different substance entirely. That is exactly why testing and transparency guide everything we do.
99% Purity, Verified by Independent Testing
Every batch of our S-23 is analyzed by [LAB NAME], an independent laboratory. The lab uses high-performance liquid chromatography (HPLC) to confirm identity and purity. Our S-23 consistently tests at 99% purity. Moreover, no batch is released until its results come back.
Precise 20mg Capsules, 60 per Bottle
Each capsule holds exactly 20mg of S-23. Pre-measured capsules remove the need to weigh small amounts of powder. Therefore, you save time and lower the risk of measuring errors. With 60 capsules per bottle, you also get plenty of material from a single batch.
Batch-Matched Certificate of Analysis
Every bottle carries a batch number. That number matches the certificate of analysis on this page. In other words, you can check the exact report for the exact product you receive. View the current report here: S-23 COA, batch [BATCH #].
Fast, Discreet Shipping
Orders placed before 20:00 leave our facility the same business day. Each parcel ships in plain, secure packaging. Meanwhile, your tracking details arrive by email as soon as the order is on its way.
Helpful, Knowledgeable Support
Need a COA copy for your records? Have a question about storage or documentation? Simply contact our team. We reply to every message, and we are glad to share technical data for your files.
Our Quality Control Process for S-23 for Sale
Before any S-23 for sale reaches our shop, it passes four documented steps. Thanks to this process, we can trace every bottle back to its source.
- Sourcing: we buy raw S-23 only from vetted manufacturers with a proven track record.
- Testing: next, an independent lab confirms identity and purity by HPLC.
- Encapsulation: after that, the material is filled into 20mg capsules under controlled conditions.
- Release: finally, we publish the COA and assign the batch number printed on each bottle.
If a batch falls below our 99% standard, we reject it. We never blend it, and we never relabel it. This strict rule is why labs return to us whenever they need S-23 for sale they can rely on.
How to Buy S-23 Online
Placing an order takes only a few minutes. Here is how to buy S-23 from Chemyo:
- Choose how many bottles you need and click Add to Cart.
- Review your cart and continue to checkout.
- Confirm that you are 21 or older and accept our research-use terms.
- Enter your shipping details and complete payment.
- Check your inbox for your confirmation and tracking number.
Planning a longer study? Then order all the bottles you need at once. That way, every sample shares one batch and one COA. This small step keeps your data more consistent.
Storage and Handling
Proper storage keeps your material in good condition. Keep S-23 capsules in their original sealed bottle. Store the bottle in a cool, dry place between 15°C and 25°C. Also, keep it away from direct light and moisture.
After opening, close the lid firmly after each use. Avoid humid spots, such as near a sink or a window. Stored this way, the capsules stay stable until the date printed on the label.
Lastly, follow standard lab safety practices with every research compound. Wear gloves, label containers clearly and keep products away from children and pets. Only qualified professionals should handle this material.
Who Buys S-23 from Chemyo?
Our customers include university labs, contract research teams and independent scientists. While their projects differ, they all share one need. They want dependable material with clear paperwork. Put simply, they need to trust what is inside the bottle.
That is the standard we work to every day. Whether you order one bottle or fifty, each unit meets the same specification. For bulk or repeat orders, contact us for custom pricing and batch reservation.
S-23 for Sale: Frequently Asked Questions
Is S-23 the same as S23 and Mastorin?
Yes. S-23, S23 and Mastorin are all names used for the same compound.
What strength are your S-23 capsules?
Each capsule contains 20mg of S-23, and every bottle holds 60 capsules.
How pure is your S-23 for sale?
Our S-23 tests at 99% purity by HPLC. The full report for each batch is linked on this page.
Is S-23 a SARM?
Yes. S-23 is a non-steroidal selective androgen receptor modulator from the aryl-propionamide family, the same family as Ostarine and Andarine.
What was S-23 originally studied for?
The main published study examined S-23 in rats as a possible male hormonal contraceptive. It never progressed to human trials.
Has S-23 been tested in humans?
No. There is no published controlled human data on S-23. All published research comes from preclinical studies.
Is S-23 approved for human use?
No. S-23 is not approved by the FDA for any use. Chemyo sells it for laboratory research only, and it is not for human or animal consumption.
Explore More Research Compounds
S-23 is often studied alongside other research compounds. For example, labs comparing aryl-propionamide SARMs often order Ostarine MK-2866 25mg and Andarine S4 50mg. Other SARMs in our range include LGD-4033 Ligandrol 10mg, RAD-140 Testolone 10mg, YK-11 Myostine 10mg and AC-262,536 10mg. We also stock MK-677 Ibutamoren 25mg, GW501516 Cardarine 10mg, GW0742 10mg and SR9009 Stenabolic 10mg. You can also browse all SARMs for sale or our full range of research compounds.
Ready to order? Add S-23 to your cart today and get lab-tested material shipped fast.
For Research Use Only. This product is sold strictly for laboratory research. It is not intended for human or veterinary use, consumption, or diagnostic purposes. It is not a drug, food, dietary supplement or cosmetic, and it has not been evaluated or approved by the FDA. Buyers must be 21 or older and agree to our Terms of Sale. Only qualified professionals should handle this product.
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