HPTA Restart: Meta-Analysis of PCT Protocols

Peer-reviewed studies, educational materials, mechanism discussions, and evidence-focused learning.

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Herbertysnilm
Posts: 2
Joined: Mon Jan 12, 2026 12:44 am

Re: SARM Binding Affinity

Post by Herbertysnilm »

That would explain why some SARMs have a much longer biological half-life than their plasma half-life suggests.
MedellinMuscle
Posts: 13
Joined: Mon Dec 08, 2025 3:25 am

Re: SARM Binding Affinity

Post by MedellinMuscle »

Day 2 of looking at these charts. The Ostarine affinity is so low compared to S4, yet Ostarine is more popular. Marketing vs Science.
SlavPower
Posts: 36
Joined: Mon Dec 08, 2025 3:19 am

Re: SARM Binding Affinity

Post by SlavPower »

Ostarine is popular because the side effect profile is manageable for beginners. High affinity SARMs like YK-11 are essentially steroids.
Peterdyday
Posts: 1
Joined: Sat Jan 03, 2026 7:16 pm

Re: SARM Binding Affinity

Post by Peterdyday »

YK-11 is a steroidal SARM anyway. Its structure is based on 19-nor. No wonder the binding is aggressive.
CoachIronwell
Posts: 62
Joined: Mon Dec 08, 2025 3:29 am

Re: SARM Binding Affinity

Post by CoachIronwell »

I think we need more research on how these interact with SHBG. SARMs usually crush SHBG levels faster than traditional AAS.
Herbertysnilm
Posts: 2
Joined: Mon Jan 12, 2026 12:44 am

Re: SARM Binding Affinity

Post by Herbertysnilm »

Which leads to more free estrogen and potential gyno issues, despite the lack of aromatization. Science is vital here.
MedellinMuscle
Posts: 13
Joined: Mon Dec 08, 2025 3:25 am

Re: SARM Binding Affinity

Post by MedellinMuscle »

Great point. The "SARM-only" cycle often fails because people ignore the endocrine feedback loop.
SlavPower
Posts: 36
Joined: Mon Dec 08, 2025 3:19 am

Re: SARM Binding Affinity

Post by SlavPower »

Does anyone have the full study on the S23 binding in canine models? I heard it was used as a male contraceptive.
Peterdyday
Posts: 1
Joined: Sat Jan 03, 2026 7:16 pm

Re: SARM Binding Affinity

Post by Peterdyday »

Yes, S23 is so suppressive it was studied for that exact reason. Not something to take lightly without a test base.
CoachIronwell
Posts: 62
Joined: Mon Dec 08, 2025 3:29 am

Re: SARM Binding Affinity

Post by CoachIronwell »

This thread should be stickied. Too many people taking these as "supplements" without understanding the AR affinity.
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