Description
The S4 Andarine + Ostarine Stack from Pure Rawz puts S4 Andarine and MK-2866 together in capsules. Each batch is checked for 99%+ purity. It’s intended for research use only.
Inside S4 Andarine + Ostarine Stack
S4 Andarine
S4 (andarine, also GTx-007) is one of the first nonsteroidal SARMs, developed by GTx Inc. alongside ostarine. It’s a partial agonist at the androgen receptor, and in rats it built muscle and bone while having much less effect on the prostate.
S4 binds the androgen receptor as a partial agonist. In muscle and bone it gives close to a full response, while in the prostate it gives a weaker one, and in the presence of full androgens it can even compete with them there.
MK-2866
MK-2866 is ostarine, also called enobosarm or GTx-024, a nonsteroidal SARM first developed by GTx Inc. It binds the androgen receptor, but its structure isn’t based on testosterone, and in lab models it acts mainly on muscle and bone with much less activity in tissues like the prostate.
Ostarine binds the androgen receptor in the cell’s cytoplasm. The receptor then moves into the nucleus and switches on androgen-responsive genes, the same basic route testosterone uses.
Why S4 Andarine + Ostarine Stack combines these compounds
Labs pair these compounds because each works through a different pathway, so combining them covers more of the system in one study. A fixed mix also means one product, one label and no drift between separate containers.
Research behind S4 Andarine + Ostarine Stack
Gao and colleagues reported in Endocrinology in 2005 that S4 restored muscle and bone in castrated rats. Kearbey and colleagues later showed it reduced bone loss in ovariectomized rats.
The best-known study is a phase 2 trial by Dobs and colleagues, published in The Lancet Oncology in 2013. It tested enobosarm in 159 patients with cancer-related muscle wasting and reported more lean body mass than placebo.
For the original studies, start with this PubMed search for S4 Andarine and MK-2866.
Choosing your option
It comes in one option (Capsules, 40mg per capsule/60ct/2400mg), priced at $135.66.
Capsules hold a measured amount each, listed in the size option with the count and total.
How labs use it
Labs comparing SARMs usually match exposure time and measure the same panel across compounds: muscle and prostate weight in rodents, plus hormone and lipid markers. That tissue-selectivity ratio is what SARM research is built around.
Liquids make small, even measurements easy, while capsules and tablets suit studies that need a fixed amount per unit.
Run a baseline panel before exposure starts. Without it, hormone changes are hard to interpret.
S4 Andarine + Ostarine Stack product details
- Contains: S4 Andarine and MK-2866
- Forms: capsules
- Size: 40mg per capsule/60ct/2400mg
- Purity: 99% or higher, verified by first- and third-party testing
- Use: laboratory research only
Purity and batch testing
Every batch is tested before it goes on sale. Identity is checked by mass spectrometry, and purity by HPLC, with a target of 99% or higher.
Each container is labeled with the product, the amount and the batch number. Email us that number and we’ll send the certificate of analysis for your batch.
How to store S4 Andarine + Ostarine Stack
Store capsules, tablets and powder in a cool, dry place out of direct light, with the lid closed tight. Write the date you opened or mixed it on the label, so anyone else in the lab knows how old it is.
Safe handling
Wear gloves and eye protection when you open or measure it, and work on a clean surface.
Label everything you prepare, keep it away from food areas, and follow your lab’s rules for disposing of sharps and chemical waste.
Supplies to have on hand
- nothing extra for capsules or tablets, as each unit is pre-measured
- a dry, sealed container if you split a bottle between projects
Other compounds to look at
- Andarine (S-4): S4 (andarine, also GTx-007) is one of the first nonsteroidal SARMs, developed by GTx Inc. alongside ostarine.
- RAD-140 + MK-677 + YK-11 Value Pack, combining RAD-140, MK-677 and YK-11
- Ostarine + Cardarine Stack (MK-2866 + GW-501516), combining MK-2866 and GW501516
- Ligandrol (LGD-4033): LGD-4033 (ligandrol, also coded VK5211) is a nonsteroidal SARM discovered by Ligand Pharmaceuticals and later licensed to Viking Therapeutics.
- S23 + S4 + GW-501516 Value Pack, combining S-23, S4 Andarine and GW501516
See the rest of our SARMs for more options.
S4 Andarine + Ostarine Stack questions
Is S4 Andarine + Ostarine Stack in stock?
Yes. It’s in stock and ships from our warehouse after your order clears.
Does it come with a certificate of analysis?
Yes. Every batch is tested, and we’ll email the certificate of analysis for your batch number on request.
Can it be used in people or animals?
No. It’s sold for laboratory research only and isn’t approved for human or veterinary use.
What’s in S4 Andarine + Ostarine Stack?
S4 Andarine and MK-2866. The section above covers each one.
How should I store it?
Follow the storage section above. In short: cold and dark for freeze-dried vials, room temperature and dry for capsules, tablets, powders and liquids, unless the label says otherwise.
Order S4 Andarine + Ostarine Stack today
Order S4 Andarine + Ostarine Stack now for $135.66. It’s in stock, and checkout takes about two minutes.
Need more for the same project? Have a look at our SARMs.
For laboratory research use only. Not for human or veterinary use. These statements have not been evaluated by the FDA.
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