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Castore: Built to Adapt

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Where science meets results. Learn peptides, training, recovery & more. No ego, no fluff—just smarter bodies, better minds, built to adapt.

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249 contributions to Castore: Built to Adapt
New paper on SLU-PP-915 - orally active ERR agonist
An Orally Active ERR Agonist, SLU-PP-915, Enhances Aerobic Exercise Capacity (1 December 2025) The authors stress that 332 is NOT orally bioavailable. "We previously developed a ERR pan-agonist, SLU-PP-332 (332), which improve aerobic performance in mice but lacks oral bioavailability. Here, we characterize SLU-PP-915 (915), a chemically distinct ERR pan-agonist that is orally bioavailable and exhibits potent in vivo exercise mimetic activity." Who can help to get the full paper and interpret the findings? Specifically , is there any new data on how much exactly SLU-PP-332 orally bioavailable (%) ?
3 likes • 1d
Totally fair point that was just a simple typo on my end, and I appreciate you pointing it out. As you’ve probably heard in every seminar I’ve given and on every podcast I’ve been on, I always refer to the SLU compounds correctly as estrogen-related receptor agonists. I even corrected Dr. Trevor publicly when he mislabeled it in his post. And honestly, even I make typos and mistakes, especially when I’m trying to answer as many questions as I can before my actual workday starts the downside of running a free education platform and trying to help as many people as possible is that my thumbs sometimes operate faster than my brain. But you’re absolutely right: SLU-PP-332 is not a PPAR-δ agonist, does not bind PPAR-δ, and does not activate the PPAR transcriptional pathway through any demonstrated mechanism. Thanks again for catching the typo the biology itself was never in question, and I truly do appreciate the engagement.
0 likes • 14h
@Anton Shakh if you DM me your email I am happy to send it. I don’t think I am allowed to post it publicly
How’s Jeter?
@Anthony Castore Your boy has been on my mind. Do we have any updates? Hope he’s doing amazing and recovering?!!! 🙏🏼💕 Avocado, my Mal, isn’t fully back, but a lot better. Appears to me it is a strain of some sort in his left hind leg. The CBD, love and attempt to keep him from being his spunky self seem to aid toward healing… 🙏🏼
2 likes • 1d
@Katharina Clig I give Jeter Pettides orally. He gets 4 droppers AM and PM. He weighs about 70lbs.
1 like • 1d
@Katharina Clig I got the large animal one. I agree it’s a little confusing how they present it.
A Late-Night Emergency With My Bulldog Exposed a Huge Gap in How We Treat Back Injuries.
Last night, I woke up to something that shook me in a way I haven’t felt in a long time. My bulldog Jeter, who’s ten now and basically my shadow, was shivering on the inhale while he slept. At first I thought maybe he was cold, or dreaming. Bulldogs dream with their whole soul, so that wasn’t unusual. But something felt off. The tremor wasn’t rhythmic like dreaming. It was sharp, almost like a nerve misfiring. When he got up from bed to walk to another room, he seemed weak like his legs weren’t receiving the normal signals from his brain. His shoulders and legs trembled slightly, his paws looked unsure beneath him, and he kept repositioning like he couldn’t get comfortable. That’s when my stomach dropped. I scooped him up, put him in the car, and Julie and I drove straight to MedVet. If you’ve ever loved a dog deeply, you know that feeling where you go from half-asleep to wide awake with one single thought: “Please let him be okay.” At MedVet they gave him a ketamine and methadone shot for pain, and they suspected a disc issue in his spine. They didn’t run an MRI that night, so we were left with the kind of diagnosis most dog owners get at first: “Likely disc compression, monitor closely.” In other words, an entire universe of things could be happening under the surface. When we finally got back home, Jeter was sedated, wobbly, and tremoring. He was trying to be strong bulldogs have a level of pride that honestly rivals ours—but he was struggling. And in moments like that, both as a practitioner and as a dog dad, you are forced to sit between two worlds: the scientific understanding of what’s happening, and the emotional weight of watching someone you love suffer. That’s what inspired me to write this for you today not just to share the story, but to teach you what’s actually going on inside a dog’s body when a disc bulges, why the symptoms show up the way they do, and how targeted regenerative peptides like Pentosan, ARA-290, TB-500, BPC-157, and SS-31 can create a powerful recovery pathway when used correctly.
3 likes • 5d
@Katharina Clig Almost eerie how the universe lines things up sometimes. I’m glad he’s still eating and acting like himself that’s usually a good sign but you’re right to keep an eye on the agility drop. A sudden “can’t jump up” moment in a young Malinois can come from a handful of things that aren’t disc-related: soft-tissue tweaks, psoas strain, SI joint irritation, even just a misstep during play. These dogs are so intense they’ll often mask discomfort until it shows up in something obvious like jumping. CBD is a solid first move. If tomorrow he’s still guarded or hesitant, let me know I can walk you through the quick triage steps to rule out disk vs. muscular vs. nerve tension and what to do in each phase. I have been researching non stop since the issue Jeter had. I give Jeter the Pettides product mentioned. It has been a fantastic for him. I have used it for over a year. Give him a little extra love for me. These pups always choose the most dramatic timing.
4 likes • 4d
Thank you so much for this message it genuinely means more than you know. When something happens to one of our bullies, it hits a different part of the heart, and hearing from another Bulldog parent who gets that bond brings a lot of comfort. I’m really grateful you shared all of this, and even more grateful that Brewski is healthy and thriving. I also really appreciate you passing the information along to your daughter. Hearing that a veterinarian found the approach thoughtful and potentially useful in her own canine care is incredibly meaningful. My only goal in sharing Jeter’s situation was to turn something frightening into something useful for others, so knowing it helped spark interest or new ideas for her practice truly feels like we made something good out of a tough moment. Jeter is continuing to improve….i am changing his name to Logan because he has actually healed like Wolverine in the X-men ! I am grateful he is ok and appreciate so many people praying for him and keeping us in your thoughts. Thank you for the kindness, the support, and for being part of this Built To Adapt family. Give Brewski some extra love from me today.
You’re Fit, Lean… and Foggy? The Hidden Form of Insulin Resistance No One Is Talking About.
Thanksgiving has a way of slowing life down just enough for you to actually notice what’s been happening underneath all the noise. You sit with people you love, share a big meal, breathe for the first time in weeks, and suddenly you’re able to feel things you usually ignore. Maybe this year, in that moment of stillness, you noticed something strange: your body feels strong, your training is dialed in, your glucose looks perfect… but your brain doesn’t match how good the rest of you feels. Maybe you felt foggy after a meal, mentally slower than usual, overwhelmed for no reason, or just “not as sharp,” even though everything on paper says you’re metabolically healthy. If that sounds familiar, you are not alone and there’s a real physiological explanation behind it. How can someone be physically insulin-sensitive yet mentally sluggish? How can your muscles get the fuel they need while your brain feels like it’s running on fumes? This article is written for you, to answer exactly that question. Central insulin resistance is the phenomenon where your brain becomes insulin-resistant even when the rest of your body remains highly insulin-sensitive. Many people experience this as a strange mismatch: they feel physically strong, metabolically healthy, and steady during training, yet their cognition feels foggy, slow, unpredictable, overwhelmed, or “under-powered.” This article explains why that happens, what the mechanisms are, how to recognize the patterns, and how to fix them, using simple language without sacrificing the biochemical accuracy that clinicians and experts expect. The first thing to understand is that the brain handles insulin differently from the rest of the body. Your muscles and liver respond directly to insulin in the bloodstream. The brain does not. For insulin to have any effect in the brain, it must cross the blood–brain barrier, bind to receptors on neurons, activate the PI3K-Akt pathway, and allow neurons to take up and use glucose. If anything disrupts that sequence, neurons will be under-fueled even if the entire rest of the body is functioning perfectly. This is why someone can have excellent fasting glucose, low insulin, perfect CGM curves, and still feel terrible cognitively. The brain can become insulin-resistant before the body gives any signal.
You’re Fit, Lean… and Foggy? The Hidden Form of Insulin Resistance No One Is Talking About.
4 likes • 7d
@Sarah Valenzuela It makes total sense you’re connecting those dots, because stress-driven brain fog and coordination issues often come from the same upstream mechanism: the brain not getting clean, stable fuel or signaling when it needs it. Yes, there absolutely are scenarios where someone can look physically healthy on the outside but have subtle neurological under-fueling that shows up as clumsiness, poor coordination, dropping things, or feeling “one step behind” with their hands. A few things can drive this: 1. Cortical under-fuelingWhen the prefrontal cortex and motor planning areas don’t get enough clean ATP, your reaction time and fine-motor precision dip. You’re strong, fit, and healthy but the “control tower” is lagging. 2. Stress-induced microglial activationStress doesn’t just fog you it slightly suppresses motor cortex efficiency. Microglia release cytokines that interfere with timing, proprioception, and the “smoothness” of movement. 3. Cerebellar fatigueThe cerebellum is incredibly energy-dependent. If it’s under-fueled, you get small misfires: dropping objects, misjudging distance, poor balance, etc. This often tracks with stress, poor sleep, or high cognitive load. 4. Glutamate overloadWhen the brain is stressed or tired, glutamate can build up in motor circuits. This causes jittery, imprecise movement and slower reaction times even when strength and fitness are excellent. “Brain under-fueling” can 100% show up as coordination issues.The good news is these are usually reversible once the brain gets the right mix of fuel, redox stability, and lower inflammatory pressure.
3 likes • 7d
It sounds like you’re dialed in and paying attention to the signals your body’s giving you. You’re absolutely on the right path, and those small tweaks you’re thinking about usually end up being the biggest levers long-term. Thank you for the good vibes. Jeter is trending in the right direction, and every little sign of improvement means a lot. 🙏🏼
VIP - is it good or bad?
I was wondering if you have archives of your articles? I just read this article from the SR about VIP and I cannot tell if it is good or bad (after already placing an order). So looking for more clarity about using it.
1 like • 7d
I’ve used VIP personally for things like switching time zones or stacking it with GLP-1 to support motility, but those are just two examples where the physiology made sense for that signal. In other situations, the same peptide can feel stabilizing or destabilizing depending on whether the cellular environment is ready for it. That’s why I always start with redox first, then look at the terrain, pathways and mechanisms. Then I feel I can make a better choice on the tool.
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Anthony Castore
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Anthony Castore — SSRP Fellow & strength coach blending peptides, training, and cellular medicine to optimize performance and recovery.

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Joined Jul 31, 2025
Powell, OH
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