S4 Peptide For Sale
Buy S4 peptide capsules. Compare live prices across 16+ vetted vendors with real cost per capsule, verified COAs and discount codes.
Buy S4 peptide capsules starting at $59.36/bottle from 16+ vetted vendors. Compare capsule bottle options by cost per capsule, price per bottle, monthly cost, discount codes and independent COAs.
About S4
S4 (andarine) is a first-generation SARM — a small molecule, not a peptide — sourced in research for muscle and bone studies. It is sold as a research chemical (capsules or an oral liquid).
Its reported half-life is ~4 hours (pre-clinical estimate), which is the main reason the community cadence above looks the way it does. Not FDA-approved.
Frequently Asked Questions: S4
Is it legal and safe to buy S4 for research?
In the US, S4 is sold strictly as a research chemical — legal to buy for laboratory research but not approved for human use. It is an investigational SARM, also called andarine, with no approved human use and a WADA ban in sport — research use only. The real variable isn't legality, it's quality: unverified suppliers can ship underdosed, impure, or mislabeled material. Every S4 vendor in the table on this page is screened for a published third-party Certificate of Analysis (COA), which is your one objective quality check.
How do I verify a S4 COA so I'm not getting an underdosed vial?
A Certificate of Analysis (COA) is the third-party lab report for one specific S4 batch — your only proof the vial is real and full-strength. Check four things: identity (it's actually S4 (andarine), not a different SARM or an underdosed capsule), assay/purity (ideally 98% or higher), a named independent lab (not the vendor's own in-house claim), and a recent test date. WPA flags COA status per listing, but a marketing screenshot isn't enough — open the actual COA on the vendor's site before paying. Every row in the table links straight to it.
Which S4 vendor should I pick?
There's no single "best" S4 vendor — it depends on what you weigh most. WPA ranks every verified vendor by a composite of assayed purity, COA recency, lifetime click popularity among researchers, final price, and in-stock plus discount availability. S4 ships as oral capsules, so a COA confirming the per-capsule milligram amount matters as much as purity. If you just want the strongest all-round value, the top-ranked S4 vendor on this page is a safe starting point — but confirm its purity and price fit your protocol first.
How much does S4 cost — and how do I know I'm not overpaying?
Judge S4 by true price per milligram, not the sticker price on one vial — a cheap small vial often costs more per mg than a larger one. Compare cost per total milligram across bottles rather than the bottle price, since capsule counts and strengths vary. WPA normalizes every verified listing to $/mg, and the live cost-per-month card estimates your real spend at the most common dose, so overpaying becomes obvious at a glance. The one catch: the lowest $/mg sometimes means buying a bigger vial than your cycle needs.
How much S4 do I need for one full cycle?
S4 has a short half-life, so research protocols typically split the daily amount into two doses, commonly totaling 25–50 mg per day over an 8-week run. A 60-capsule bottle covers roughly a month at two capsules a day, so a full cycle often needs two bottles. Protocols vary and this reflects the most common community setup, not medical advice — research use only. Use the cost-per-month card and the calculator on this page to size your exact run, then buy enough to finish a cycle without re-ordering mid-protocol.
Are discount codes available for S4?
Yes — many verified S4 vendors offer WPA researcher discount codes, and those savings are already baked into the $/mg ranking on this page, so you're never comparing a pre-discount price against a post-discount one. Codes do change, and some exclude sale items or carry order minimums. Each listing shows the current code and the discounted price where one exists.
Lowest priced S4 peptide for sale?
To surface the lowest priced S4 for sale, WPA continuously compares 16 USA suppliers and 968 "for research" products, ranking every verified S4 listing by true cost so the cheapest options rise to the top. The lowest priced single S4 capsule currently starts at $59.36. We currently track 2 S4 products in our system. Pricing is generally refreshed weekly as vendors update stock, prices, and discount codes.