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Someone online suggested that giving two peptides—BPC-157 and TB-500—to a rat while it does endurance running could boost the growth of blood vessels (angiogenesis) and therefore improve its aerobic fitness more than running alone. The idea is that the peptides would help the body build better vasculature (network of blood vessels), so the animal would get a bigger “engine” for delivering oxygen during longer runs. That’s the basic claim being floated, not a reported clinical trial. BPC-157 and TB-500 are short protein fragments people call peptides. BPC-157 comes from a protein found in stomach juice and is sold by some as a healing or gut-support compound. TB-500 is a synthetic piece of a natural protein called thymosin beta-4, and it’s marketed for tissue repair and movement recovery. In plain terms: proponents say BPC-157 helps tissues heal and TB-500 helps cells move and repair, and both have been linked in lab studies to processes like reduced inflammation and new blood vessel formation. Neither is an approved drug for these uses in people. What the actual science shows is mostly limited, early, and largely in animals or cells in a dish. Some rodent studies have reported increased angiogenesis or faster healing when these peptides were used after injury. But those studies are small, often use doses and methods that don’t match how humans would take them, and don’t reliably measure real-world performance gains like longer running times or improved VO2 max (a common measure of aerobic fitness). There isn’t good evidence from controlled human trials that taking these peptides while training boosts aerobic base or endurance. In short: animal and lab signals are interesting but not proof that the same effects happen safely or usefully in people. Why it matters is straightforward. If a safe, legal treatment could legitimately grow better blood vessel networks in muscle and speed up building an aerobic base, endurance athletes and people wanting to improve fitness would care a lot. Even small improvements in blood flow can affect recovery and performance. But because current evidence is weak and mostly preclinical (not done in people), athletes should be cautious about assuming benefit. Training, sleep, nutrition, and proven recovery methods remain the reliable ways to build endurance today. There are important caveats and risks. BPC-157 and TB-500 are not approved medicines for boosting performance; they’re often sold as research chemicals with unknown purity and dosing. Side effects, long-term safety, and interactions with other medications are not well studied. Encouraging angiogenesis (making new blood vessels) isn’t always harmless — in some contexts it could worsen disease processes like cancer or abnormal tissue growth, though that risk in healthy athletes is not well characterized. Using unregulated peptides can also lead to legal and sporting consequences in competitions that ban performance-enhancing substances. Bottom line: lab hints that these peptides affect blood vessels are interesting, but there’s no reliable human proof they boost endurance when stacked with running, and using them carries unknown risks.
Source: r/Peptides