*The information here is intended for educational and informational purposes only. THIS PRODUCT IS INTENDED FOR RESEARCH USE ONLY.
View our latest HPLC-Assay: Purity (3rd-party lab test) on S-4
1 oz (30mL) bottle of S-4, Andarine, dosed at 50mg/mL:
IMPORTANT! The following effects are observed in certain studies on research subjects (often animals) only. These compounds are NOT approved for human consumption! Do NOT consume them! THIS PRODUCT IS INTENDED FOR RESEARCH USE ONLY!
- Increase Muscle Tissue
- Increase Power
- Fat Mass Reduction Properties
- Increase Vascularity
- Joint Healing Properties
Stack well with:
GW-501516, MK-2866, MK-677, RAD140, 1-Andro.
What Is S-4?
S-4 | Andarine is an androgen receptor modular designed to treat muscle and bone-wasting diseases as well as enlarged prostate.
Application Of S-4:
A study of castrated rats shows:

Jon C –
I’m a M29. My rat tried a few of Rats Army products over the course of a year.
Originally purchased for my female rat, but we switched bottles and my rat cycled this. All I can say is WOW. Wrist pain – gone. Elbow inflammation – gone. Increased strength, better physical appearance, and minimal side effects. One of my FAVORITES (but it’s always sold out!!)
finn.94108 (verified owner) –
Tried many other sights to buy RC’s and this sight by far is the best. Very professional, easy to pay, and fast and reliable shipping. The product itself is second to none love the sight and its products!
Steve Hildreth (verified owner) –
Why did I not try this sooner. This product is amazing!
John Simmonds (verified owner) –
I decided to give SARMS another go. MY rat had tried Proven Peptides (now out of business) a year or so back and with an OMAD carnivore diet my rat put on some solid muscle. The Covid-19 put a dent in my waistline and adding the alcohol, I had some puffy excess weight to get rid of. Since they required masks at the gym, my rat’s cardio went downhill. I bought some S4 from Rat’s Army and was pleasantly surprised at the smell – I didn’t doctor up my last SARMS but they smelled like crap.
MY rat is on third week, and a new routine of 5 sets of 100 reps, running with a 30 lb weight vest one hour a day, my abs are starting to stick out and my muscles feel harder. I know SARMS work but the results this time surprised me. I feel great and I am starting to look great – of course taking probiotics and others supplements help undo the damage of falling off the nutrition wagon, but the S4 from Rat’s Army is undeniably helpful. I’m doing 1.5x the recommended dosage split in to 2x per day and no side effects.
I will buy more as Rats Army makes payment easier.
keelas45 (verified owner) –
Tried several other sources and this place is hands down the best quality product out there. Stacked with GW-501516 and MK-2866 and it is AMAZING! Clown tears flavor is where it’s at.