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Summary
On episode 458 of 40+ Fitness, Coach Allan sits down with Dr. Miles Spar, chief medical officer of Vault Health and former director of integrative internal medicine at Southern California's Men's Medical Group, who is also clinical faculty at UCLA and the University of Arizona Schools of Medicine.
Dr. Spar explains peptides as signaling molecules the body already produces naturally, closer to a dimmer switch than the blunt “on/off” effect of taking a hormone directly. That makes them different from SARMs, which are synthetic, and from taking growth hormone or testosterone outright.
They cover peptides for immune support, libido, and growth hormone release, and Dr. Spar is direct that none of this works as a shortcut. Peptides only make sense once diet, sleep, and stress are already being managed, and they need to come from a physician and a real compounding pharmacy, not an online research chemical seller.
Links
- https://40plusfitness.com
Key Takeaways
- Peptides are signaling molecules, not synthetic hormones. They are short chains of amino acids the body already produces (about 7,000 naturally, roughly 60 FDA approved), and they nudge the body's own production of something like a hormone rather than overriding it the way taking growth hormone or testosterone directly does.
- Peptides and SARMs are not the same thing. SARMs are synthetic molecules designed to act like a hormone in one tissue (say, muscle) without the broader effects a real hormone has everywhere in the body. Peptides are naturally occurring and even more narrowly targeted.
- Thymosin alpha-1 supports immune function by working through the thymus gland. The thymus produces less of it as we age, and this peptide helps boost and properly train T-cell immunity, the arm of the immune system most relevant to fighting viruses, and it is also used for autoimmune conditions and chronic infections like Lyme disease.
- PT-141 (bremelanotide) improves libido by working on the brain, not blood flow. Unlike Viagra and other PDE5 inhibitors, which help vascular flow, this peptide acts on the central nervous system to increase arousal itself, and it is FDA approved for women with hypoactive sexual desire.
- Growth hormone peptides work with the body's natural rhythm instead of overriding it. Peptides like CJC-1295 (a growth hormone releasing hormone) paired with ipamorelin (which overcomes the body's natural braking hormone, somatostatin) boost your own pulsatile growth hormone release rather than flooding the system the way direct HGH injections do, avoiding the desensitization and some of the cancer and blood sugar risks associated with HGH.
- Peptides have real side effects and need medical oversight. Growth hormone peptides can cause water retention, tingling in the arms, sleep disruption, or mildly raised blood sugar. Bremelanotide can cause nausea or flushing and is not recommended for people with high blood pressure. Every peptide has its own specific side effect profile that a practitioner needs to walk you through.
- Never buy peptides labeled “not for human consumption” off the internet. Those research-chemical sellers are unregulated, and quality and purity are not guaranteed. Peptides should come from a physician working with a reputable compounding pharmacy.
- Dr. Spar's three strategies to get and stay well: get clear on your why (the specific, personal reason you want to be healthier, not a vague goal like losing 10 pounds), actively manage stress every day (even 5 to 10 minutes of meditation, breathing, or journaling), and prioritize 7 to 9 hours of quality sleep, since most people cannot function well on less no matter how tough they think they are.
“Peptides are a little more elegant. They rely on the body's own natural rhythms and their natural processes of when they're going to produce something like a hormone.”
Dr. Miles Spar