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Someone on Reddit asked which peptides might boost endurance and strength for biking. They named a few compounds—SLUPP, MOT-C, glutathione, and IPA—and wanted advice on what could help. There’s no formal study attached to that post; it’s just a person looking for ideas and experiences. Peptides are small bits of proteins. Your body already makes many of them to send messages between cells. Some peptide drugs are designed to mimic those natural signals, nudging the body to do things like release hormones, repair tissue, or change metabolism. Glutathione and IPA aren’t classic signaling peptides in the same way: glutathione is an antioxidant that cells use to manage damage and stress, while IPA (indole-3-propionic acid) is a gut microbe–related molecule sometimes described for its antioxidant effects. MOT-C (short for MOTS-c) is a tiny mitochondrial peptide that researchers study for effects on metabolism. SLUPP isn’t a widely recognized name in scientific literature; it may be a misspelling, shorthand, or a less-studied experimental peptide. Actual evidence for these things helping athletic endurance or strength is thin and mixed. MOTS-c has shown interesting effects in mice—some studies suggest it can improve metabolic health and exercise capacity in animal models. For humans, data are limited to small early-stage studies or lab tests, so we don’t know how big or reliable any benefit would be. Glutathione can support cellular health, but oral glutathione supplements often get broken down in the gut and may not raise levels meaningfully; IV or specially formulated versions are used in medical settings, not casual performance enhancement. IPA and some niche compounds have mostly preclinical (lab or animal) evidence and anecdotal reports on forums, not rigorous human trials. In short: promising signals in animals or cells do not equal proven performance boosts in people. Why this matters: endurance athletes, weekend cyclists, or anyone wanting to improve fitness are understandably curious about biochemical shortcuts. If a peptide truly increased muscle output or delayed fatigue with minimal downsides, it could be appealing. But because human data are sparse, most people won’t see guaranteed benefits, and the cost, source quality, and legality can be barriers. Athletes should also consider that sports organizations may ban certain experimental substances, and using unregulated products can be risky. There are important caveats. Many peptides sold online are unregulated, mislabeled, or contaminated. Doses and long-term safety are often unknown. Side effects depend on the compound but can include immune reactions, hormone changes, or unexpected metabolic effects. People with medical conditions, pregnant or breastfeeding individuals, and competitive athletes should be especially cautious. Always check reliable sources, consult a doctor familiar with sports medicine, and be skeptical of forum anecdotes. Bottom line: some of these molecules show early promise in lab or animal studies, but solid, reliable human evidence for boosting biking endurance or strength is lacking, and safety, quality, and legality concerns are real.
Source: r/Peptides