S4 - Warrior Labs

Want to boost your metabolism and build strength while in a caloric deficit? S-4 can do just that. S4, or Andarine, SARM designed to promote muscle growth and fat loss. It works by selectively binding to androgen receptors in muscle and bone tissue, stimulating anabolic activity while minimizing androgenic effects in other tissues, which helps enhance strength and muscle mass.

30 Day Supply*

50mg of S-4

Length of research

12 Weeks

PCT Yes or No?

Yes, you should take a  PCT & Cycle Defender with this product.

Commonly Stacked with

S-4 is commonly stacked with Tesofensine & MK2866 for improved fat loss and strength

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Our return/exchange policy is valid for only 30 days. 

We offer free USPS ground shipping (5-day) orders $99+ and 2-day priority shipping for a $20 fee. In most cases, orders before 3pm PST ship the same day & all other orders are fulfilled within 24 hours. (excluding holidays & weekends)

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If you attempted to place an order multiple times but did not receive an order confirmation email with a 6-digit order number, this means your order did not go through. These transactions shown on your account will clear & fall off or self-cancel within 24-48 hours. Please do not contact customer service unless it's already been 3 business days and the charges have still not reversed. If you need to resubmit your order please call our customer service line at 833-399-3799. 

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Please note that Prime Sports Nutrition is not responsible for any delays with deliveries caused by UPS. Prime Sports Nutrition is only responsible for delivering your package within the cut off times disclosed above. Any delay with a Next Day Delivery package caused by UPS must be disputed directly with the carrier. In other words, Prime Sports Nutrition cannot issue a refund for any Next Day Air package that was dispatched to UPS within the cut off time but delayed by UPS.

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To be eligible for a return, the product/s must be unused and sealed. The products must also be in the original packaging. Prior to returning a package you are required to get an approval from our customer fulfillment department via email (info@shopteamprime.com) Any packages sent without approval will not be refunded. A 20% restocking fee is applicable to order cancellations regardless of whether the package has shipped or not. 

Do not send packages without prior approval to any Prime Sports Nutrition location as it will not be processed.

ALL muscle builder/sarms products are final sale. Regardless if item hasn't left our shipping department.

For any damaged shipments, please submit images of damaged goods & package to our customer service email: info@PrimeSportsNutrition.com

We are not responsible for lost or stolen packages. You may purchase Aftership or Shipping Protection during checkout to protect yourself from porch piracy. Alternatively, you can open a claim with the responsible carrier. 

We do not provide free returns unless the incorrect product was delivered.

Upon receipt of the package, one of our team members will contact you to proceed with the exchange/return.

Click here to start your return

Customer Service Hours: Open Daily 11am-5pm PST. We typically respond to inquires within 24hrs. Please email: Info@PrimeSportsNutrition.com or call us by phone at (833) 399-3799.