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S23
S23 is a high-affinity AR agonist. Density, not water weight. Typical dose 10 mg. Needs a PCT.
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S23 is a high-affinity, non-steroidal androgen receptor agonist. In preclinical research, it displayed full agonist activity in vitro and anabolic activity in muscle and bone. 10 mg per capsule. 60 capsules per bottle.
S23 is studied for androgen-receptor activity in skeletal muscle - not for water loading, dehydration or stimulant-driven weight loss. It is not a diuretic or direct fat burner. During a cut, fat loss still comes from an energy deficit.
Yes. A full agonist at this affinity suppresses hypothalamic-pituitary-gonadal output. LH and FSH fall for the window. Use Recharge after, then bloodwork. That is part of running S23.
A partial ligand occupies the androgen receptor and only partly activates it. S23 occupies AR and turns it fully on. That is why lean mass on this molecule is dry contractile tissue, and why endogenous testosterone output is suppressed for the window.
S23 is anti-catabolic when calories drop. The diet drops the fat. S23 keeps contractile tissue, so the scale change is leaner. It is not a fat-burner and not a stimulant. PCT is not optional.
Every batch is independently tested by a third-party lab before it is released for sale. Research products sold by APH Science are strictly for research purposes only and are not intended for human consumption. Consult a healthcare professional before use.
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Key benefits
Locks onto muscle
High-affinity, non-steroidal AR agonist. Full agonist activity in vitro. Anabolic activity in muscle and bone in preclinical research.
How it works
Density, not water weight
Studied for AR activity in skeletal muscle. Not a diuretic or direct fat burner. The cut still comes from the deficit.
How it works
Needs a PCT
Not optional. A full agonist this strong suppresses your own testosterone. Pair Recharge after, then bloodwork.
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Locks onto muscle
S23 is a high-affinity, non-steroidal androgen receptor agonist. In preclinical research, it displayed full agonist activity in vitro and anabolic activity in muscle and bone.
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Full AR agonistHigh-affinity androgen receptor binding with full agonist activity identified in vitro.
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Muscle and boneStudied preclinically for anabolic activity in skeletal muscle and bone.
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10 mg per capsulePrecisely measured oral format. 60 capsules per bottle.
Receptor-Driven Muscle
S23 is studied for androgen-receptor activity in skeletal muscle - not for water loading, dehydration or stimulant-driven weight loss.
It is not a diuretic or direct fat burner. During a cut, fat loss still comes from an energy deficit. Resistance training and protein intake remain central to retaining lean mass.
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Contractile focusThe focus is lean tissue - not temporary fluid weight.
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No water manipulationIts proposed mechanism is androgen-receptor signalling, not dehydration or water loading.
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The cut still mattersFat loss comes from the deficit. Training and protein help preserve lean mass.
Needs a PCT
A full androgen-receptor agonist at this affinity suppresses hypothalamic-pituitary-gonadal output. LH and FSH drop. Endogenous testosterone falls for the window.
Plan PCT. Use Recharge after, then bloodwork. That is part of running S23, not an optional extra.
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PCT afterNot optional. Pair Recharge after the window.
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HPG suppressionFull AR occupancy. LH, FSH and own T fall for the cycle.
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Bloodwork afterConfirm recovery. Do not skip the labs.
Product FAQs
Contact us Contact usWhat is S23?
S23 is a high-affinity, non-steroidal androgen receptor agonist. In preclinical research, it displayed full agonist activity in vitro and anabolic activity in muscle and bone. 10 mg per capsule. 60 capsules per bottle. Needs a PCT.
How does S23 work?
It fully activates AR in muscle. Protein synthesis goes up. On a cut that holds contractile tissue while fat can come off. The diet drops the fat. S23 keeps the muscle.
Does S23 require PCT?
Yes. A full agonist at this affinity suppresses LH, FSH and endogenous testosterone for the window. Use Recharge after, then bloodwork.
Is this for human consumption?
No. Research products are for laboratory research only. Consult a qualified professional and follow your institutional rules.
What does full agonist mean?
S23 occupies the androgen receptor and turns it fully on. Lean mass is dry contractile tissue. Endogenous testosterone output is suppressed for the window. That is the S23 design.
Selectivity and tissue targeting
Many SARMs are studied for preferential action in muscle and bone versus broader androgen effects. Exact selectivity depends on the molecule - do not assume every SARM behaves like every other.
What does the labelled dose mean?
Typical dose on the listing is 10 mg. 60 capsules. Typical window 8-12 weeks.
Storage
Keep sealed, cool, and dry away from direct light. Follow any lot-specific storage guidance included with your order.
Can it be stacked with other research products?
Yes in the sense that multi-compound research is common - but stack design is your protocol responsibility. Use the product pages and literature, not social media cycle sheets, as the source of truth.
What makes S23 different in the APH catalogue?
S23 is one of the most potent SARMs, built for dry, hard lean mass and bone density together. Androgenic, so a standard PCT is recommended after a cycle.
Who typically buys S23?
Buyers usually arrive looking for a specific training or research goal and want a labelled, consistently supplied product from a UK-facing brand. S23 should be chosen only when it matches that goal and the product category on this page.
If you are unsure, use the on-page quiz (where shown), read the FAQs, or contact support before ordering multi-bottle quantities.
How should I store S23?
Store S23 sealed in a cool, dry place away from direct sunlight, moisture, and heat sources. Keep out of reach of children. Do not use if the seal is broken or the product looks compromised.
Follow any extra storage notes on the label (for example cold-chain guidance on certain research formats).
Is this suitable to stack with other APH products?
Many customers build multi-product carts (for example a primary compound plus recovery support). Whether S23 fits a stack depends on the product class and your goal - use the description, FAQ, and quiz on this page as a starting point.
This is catalogue guidance only, not medical advice. When in doubt, keep the stack simple and verify compatibility yourself.
What makes APH Science different for this product?
S23 is one of the most potent SARMs, built for dry, hard lean mass and bone density together. Androgenic, so a standard PCT is recommended after a cycle.
What dose is on the S23 label?
Use the milligram dose printed on the bottle and this page.
Can I stack S23 with other APH products?
Stack only what matches this product class. Check the description on this page rather than generic recovery or strength copy from another SKU.
This is catalogue guidance only, not medical advice.
What shipping and cart benefits apply when I buy S23?
S23 counts toward free UK shipping over £100, free protein gift thresholds, and next-day gift tiers in the same cart as every other APH Science product. Discrete packaging is standard. Tracked options are available at checkout depending on destination and service level.
How should I store S23 after delivery?
Store S23 in a cool, dry place away from direct sunlight and moisture. Keep the bottle closed between uses. Do not use past any stated best-before guidance on the pack. If the product is a research peptide vial rather than a capsule bottle, follow the dry-storage and reconstitution notes on that product page instead.
Is S23 suitable for beginners?
If you are new to this category, start by reading the full product description, FAQ, and any dosage or research framing on the page. S23 is positioned for buyers who already understand the compound class - not as a casual everyday multivitamin. When in doubt, choose a lower entry point or speak to a qualified professional before use.
Does S23 qualify for subscribe and save or bulk pricing?
Where multi-bottle or bulk tiers are shown on the product page, the unit price drops as you increase quantity - that is the live price you add to cart. Subscription options appear only when configured for that SKU. Always check the buy box on S23 for the current offer rather than assuming a sitewide discount code applies.
What should I do if I have a question about my S23 order?
Contact APH Science support with your order number and the product name (S23). Typical queries include delivery timing, batch documentation, and stacking advice. Response times are usually within one business day on UK working days.
Where do you ship from?
Orders dispatch from the UK with tracked shipping options. Free UK shipping applies on carts over £100.
How long does delivery take?
Timing depends on the service selected at checkout and courier performance. You will receive tracking when the order leaves the warehouse.
How are orders packed?
Orders are dispatched from the UK with standard e-commerce packing. Tracking is provided so you can follow the parcel in transit.
Is every batch third-party tested?
APH Science targets independent lab verification for research batches before release. Certificate or purity paperwork can be requested where available for your lot.
How do bulk buy discounts work?
Where Buy 1 / Buy 2 / Buy 3 tiers appear on the product, choosing a higher tier applies the stated saving at add-to-cart. The price on the button updates to match the selected tier.
How do I track an order?
Use the Track order page with your order details once you have confirmation and tracking. Contact us if a label has not appeared within the expected dispatch window.
How fast do UK orders ship?
Orders typically leave the UK warehouse within 1–2 working days. Free UK shipping applies over £100. International options depend on destination and product type - checkout shows available rates.
All orders use discreet outer packaging. Tracking is provided once the parcel is with the carrier.
Can I get batch / CoA documentation?
Where certificates of analysis or batch documentation are available for a product, APH Science can supply them on request. Include your order number and product name when contacting support.
Keep screenshots of the product page and your invoice for your own records if your lab requires them.
