HPTA Restart: Meta-Analysis of PCT Protocols
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Herbertysnilm
- Posts: 2
- Joined: Mon Jan 12, 2026 12:44 am
Re: SARM Binding Affinity
That would explain why some SARMs have a much longer biological half-life than their plasma half-life suggests.
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MedellinMuscle
- Posts: 13
- Joined: Mon Dec 08, 2025 3:25 am
Re: SARM Binding Affinity
Day 2 of looking at these charts. The Ostarine affinity is so low compared to S4, yet Ostarine is more popular. Marketing vs Science.
Re: SARM Binding Affinity
Ostarine is popular because the side effect profile is manageable for beginners. High affinity SARMs like YK-11 are essentially steroids.
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Peterdyday
- Posts: 1
- Joined: Sat Jan 03, 2026 7:16 pm
Re: SARM Binding Affinity
YK-11 is a steroidal SARM anyway. Its structure is based on 19-nor. No wonder the binding is aggressive.
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CoachIronwell
- Posts: 62
- Joined: Mon Dec 08, 2025 3:29 am
Re: SARM Binding Affinity
I think we need more research on how these interact with SHBG. SARMs usually crush SHBG levels faster than traditional AAS.
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Herbertysnilm
- Posts: 2
- Joined: Mon Jan 12, 2026 12:44 am
Re: SARM Binding Affinity
Which leads to more free estrogen and potential gyno issues, despite the lack of aromatization. Science is vital here.
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MedellinMuscle
- Posts: 13
- Joined: Mon Dec 08, 2025 3:25 am
Re: SARM Binding Affinity
Great point. The "SARM-only" cycle often fails because people ignore the endocrine feedback loop.
Re: SARM Binding Affinity
Does anyone have the full study on the S23 binding in canine models? I heard it was used as a male contraceptive.
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Peterdyday
- Posts: 1
- Joined: Sat Jan 03, 2026 7:16 pm
Re: SARM Binding Affinity
Yes, S23 is so suppressive it was studied for that exact reason. Not something to take lightly without a test base.
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CoachIronwell
- Posts: 62
- Joined: Mon Dec 08, 2025 3:29 am
Re: SARM Binding Affinity
This thread should be stickied. Too many people taking these as "supplements" without understanding the AR affinity.
