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    <title>Peptivis Research</title>
    <link>https://peptivisresearch.com</link>
    <description>Evidence-based education on peptide science, performance, and longevity. What the research actually says, no hype, no sales.</description>
    <language>en</language>
    <item>
      <title><![CDATA[Glutathione: Separating the Master Antioxidant Hype from the Evidence]]></title>
      <link>https://peptivisresearch.com/articles/glutathione-antioxidant-evidence</link>
      <guid>https://peptivisresearch.com/articles/glutathione-antioxidant-evidence</guid>
      <pubDate>Tue, 21 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Glutathione is a genuinely central cellular antioxidant, but oral supplements face a serious bioavailability problem. Here is what the human evidence supports, why precursor approaches exist, and where the marketing outruns the science.]]></description>
    </item>
    <item>
      <title><![CDATA[Growth Hormone Peptides Compared: Ipamorelin, CJC-1295, and Tesamorelin]]></title>
      <link>https://peptivisresearch.com/articles/gh-peptides-compared</link>
      <guid>https://peptivisresearch.com/articles/gh-peptides-compared</guid>
      <pubDate>Mon, 20 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Ipamorelin, CJC-1295, and tesamorelin are often lumped together as growth hormone peptides, but they work through different mechanisms and carry very different regulatory status. This comparison separates the ghrelin mimetics from the GHRH analogs.]]></description>
    </item>
    <item>
      <title><![CDATA[Glycine and Sleep: What the Small Trials Actually Show]]></title>
      <link>https://peptivisresearch.com/articles/glycine-and-sleep</link>
      <guid>https://peptivisresearch.com/articles/glycine-and-sleep</guid>
      <pubDate>Sun, 19 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Glycine is an inhibitory neurotransmitter with a small but intriguing evidence base for sleep quality and body-temperature regulation. Here is what the human trials found, and how it sits alongside magnesium and melatonin.]]></description>
    </item>
    <item>
      <title><![CDATA[PT-141 and Libido: A Research Breakdown]]></title>
      <link>https://peptivisresearch.com/articles/pt-141-libido-research</link>
      <guid>https://peptivisresearch.com/articles/pt-141-libido-research</guid>
      <pubDate>Sat, 18 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[PT-141, or bremelanotide, is an FDA-approved prescription drug for one specific condition. This breakdown covers its melanocortin mechanism, the trial evidence, and why the off-label hype runs well ahead of the science.]]></description>
    </item>
    <item>
      <title><![CDATA[L-Carnitine for Energy, Fat Metabolism and Recovery]]></title>
      <link>https://peptivisresearch.com/articles/l-carnitine-energy-and-recovery</link>
      <guid>https://peptivisresearch.com/articles/l-carnitine-energy-and-recovery</guid>
      <pubDate>Fri, 17 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[L-carnitine shuttles fatty acids into mitochondria, but its reputation as an energy and fat-loss aid outruns the human evidence. Here is what controlled trials actually show, plus the honest TMAO question.]]></description>
    </item>
    <item>
      <title><![CDATA[GHK-Cu for Skin and Hair: What the Research Shows]]></title>
      <link>https://peptivisresearch.com/articles/ghk-cu-for-skin-and-hair</link>
      <guid>https://peptivisresearch.com/articles/ghk-cu-for-skin-and-hair</guid>
      <pubDate>Thu, 16 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[GHK-Cu is a copper-binding tripeptide with real topical cosmetic data and a large body of preclinical wound-healing work. This breakdown separates what human studies actually support from what remains early-stage.]]></description>
    </item>
    <item>
      <title><![CDATA[Peptide Safety and Quality: Why 'Research Chemical' Does Not Mean Safe]]></title>
      <link>https://peptivisresearch.com/articles/peptide-safety-and-quality</link>
      <guid>https://peptivisresearch.com/articles/peptide-safety-and-quality</guid>
      <pubDate>Wed, 15 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Peptides sold as 'research chemicals' sit outside pharmaceutical manufacturing standards. This is an educational look at why the absence of regulation, quality control, and human safety data makes unapproved compounds genuinely risky.]]></description>
    </item>
    <item>
      <title><![CDATA[How to Evaluate Supplement Claims: A Reader's Toolkit]]></title>
      <link>https://peptivisresearch.com/articles/how-to-evaluate-supplement-claims</link>
      <guid>https://peptivisresearch.com/articles/how-to-evaluate-supplement-claims</guid>
      <pubDate>Mon, 13 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[A practical toolkit for reading past the marketing: how to spot weak evidence, funding bias, surrogate endpoints, and the difference between absolute and relative risk, so you can judge supplement claims yourself.]]></description>
    </item>
    <item>
      <title><![CDATA[Magnesium for Performance and Sleep: Separating Signal From Hype]]></title>
      <link>https://peptivisresearch.com/articles/magnesium-for-performance-and-sleep</link>
      <guid>https://peptivisresearch.com/articles/magnesium-for-performance-and-sleep</guid>
      <pubDate>Mon, 13 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Magnesium is an essential mineral involved in hundreds of reactions, and a lot of people fall short of intake targets. But the gap between correcting deficiency and chasing extra benefit is where most of the confusion lives.]]></description>
    </item>
    <item>
      <title><![CDATA[Berberine and Metabolic Health: What the Evidence Says]]></title>
      <link>https://peptivisresearch.com/articles/berberine-metabolic-health</link>
      <guid>https://peptivisresearch.com/articles/berberine-metabolic-health</guid>
      <pubDate>Sat, 11 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Berberine is marketed as 'natural metformin' and 'nature's Ozempic.' We separate the plausible mechanistic science and modest human trial data from the marketing, and explain why bioavailability and product quality complicate the picture.]]></description>
    </item>
    <item>
      <title><![CDATA[Rapamycin and Longevity Research: What the Science Actually Shows]]></title>
      <link>https://peptivisresearch.com/articles/rapamycin-and-longevity-research</link>
      <guid>https://peptivisresearch.com/articles/rapamycin-and-longevity-research</guid>
      <pubDate>Sat, 11 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Rapamycin extends lifespan in mice more reliably than almost any other molecule, which is exactly why it draws so much longevity interest. But it is a prescription immunosuppressant, and the human longevity case remains experimental.]]></description>
    </item>
    <item>
      <title><![CDATA[The Science of Sleep and Recovery]]></title>
      <link>https://peptivisresearch.com/articles/sleep-and-recovery-science</link>
      <guid>https://peptivisresearch.com/articles/sleep-and-recovery-science</guid>
      <pubDate>Thu, 09 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Sleep is the most powerful recovery tool we have, yet it's the easiest to neglect. Here's how sleep architecture drives adaptation, and where common sleep aids honestly fit.]]></description>
    </item>
    <item>
      <title><![CDATA[GLP-1 Medicines and the Longevity Question: What the Research Actually Supports]]></title>
      <link>https://peptivisresearch.com/articles/glp1-longevity-research</link>
      <guid>https://peptivisresearch.com/articles/glp1-longevity-research</guid>
      <pubDate>Wed, 08 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[GLP-1 drugs like semaglutide have transformed metabolic medicine, and researchers are now asking whether their benefits extend toward longevity-adjacent outcomes. Here is a careful look at the evidence, and why these are prescription medicines requiring medical supervision.]]></description>
    </item>
    <item>
      <title><![CDATA[What Are Peptides? A Plain-English Guide]]></title>
      <link>https://peptivisresearch.com/articles/what-are-peptides</link>
      <guid>https://peptivisresearch.com/articles/what-are-peptides</guid>
      <pubDate>Wed, 08 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Peptides are short chains of amino acids that sit between individual building blocks and full proteins. Here is what they actually are, why scientists study them, and how to read past the marketing hype.]]></description>
    </item>
    <item>
      <title><![CDATA[The Evidence Hierarchy: How to Tell a Real Claim From a Good Story]]></title>
      <link>https://peptivisresearch.com/articles/evidence-hierarchy-explained</link>
      <guid>https://peptivisresearch.com/articles/evidence-hierarchy-explained</guid>
      <pubDate>Thu, 02 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Not all evidence is equal. This guide walks through the evidence pyramid, explains why 'studies show' is so often misleading, and lays out the Peptivis rating system for scoring how much we actually know.]]></description>
    </item>
    <item>
      <title><![CDATA[The Science of Peptides and Recovery: Signal, Noise, and What Actually Heals]]></title>
      <link>https://peptivisresearch.com/articles/peptides-and-recovery-science</link>
      <guid>https://peptivisresearch.com/articles/peptides-and-recovery-science</guid>
      <pubDate>Thu, 02 Jul 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Recovery peptides like BPC-157 and TB-500 dominate online forums, but the gap between preclinical excitement and human evidence is wide. Here is an honest map of what the science does and does not show.]]></description>
    </item>
    <item>
      <title><![CDATA[Creatine Beyond the Gym: Cognition, Aging, and Mood]]></title>
      <link>https://peptivisresearch.com/articles/creatine-beyond-the-gym</link>
      <guid>https://peptivisresearch.com/articles/creatine-beyond-the-gym</guid>
      <pubDate>Sun, 28 Jun 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Creatine is the most-studied sports supplement in history, but its most interesting research may lie outside the weight room. We examine the evidence for creatine in cognition, healthy aging, and mood, and where the hype outruns the data.]]></description>
    </item>
    <item>
      <title><![CDATA[Growth Hormone Secretagogues Explained: Ipamorelin, CJC-1295, and What the Science Actually Says]]></title>
      <link>https://peptivisresearch.com/articles/growth-hormone-secretagogues-explained</link>
      <guid>https://peptivisresearch.com/articles/growth-hormone-secretagogues-explained</guid>
      <pubDate>Fri, 26 Jun 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Growth hormone secretagogues are compounds designed to nudge the body's own growth hormone release rather than replace it. Here is how they work, what the research does and does not support, and their regulatory status.]]></description>
    </item>
    <item>
      <title><![CDATA[Collagen Peptides for Joints and Skin: What the Trials Actually Show]]></title>
      <link>https://peptivisresearch.com/articles/collagen-for-joints-and-skin</link>
      <guid>https://peptivisresearch.com/articles/collagen-for-joints-and-skin</guid>
      <pubDate>Wed, 24 Jun 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[Collagen peptides are one of the few supplements in the recovery space with real randomized human trials. Here is an honest look at the evidence for skin, joints, and tendons, including the effect sizes and the industry-funding caveats.]]></description>
    </item>
    <item>
      <title><![CDATA[NAD and Aging: The Mouse Hype and the Human Reality]]></title>
      <link>https://peptivisresearch.com/articles/nad-and-aging</link>
      <guid>https://peptivisresearch.com/articles/nad-and-aging</guid>
      <pubDate>Sat, 20 Jun 2026 00:00:00 GMT</pubDate>
      <description><![CDATA[The NAD-decline hypothesis is one of the most talked-about ideas in longevity science, and NMN and NR supplements have built an industry on it. We separate the compelling mouse data from what human trials have actually shown.]]></description>
    </item>
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