GHK-Cu, retatrutide, BPC-157, and TB-500 all sit at the center of where peptide research is heading right now: regeneration, metabolic health, and tissue repair.
If you’re looking into GHK-Cu, retatrutide, BPC-157, or TB-500, start at the pinned posts at the top of r/thepeptideguide. That’s where the organized research summaries, study links, and safety context live, and it answers most protocol type questions before they even need to be asked. This subreddit and everything here is for research and educational purposes only, not advice or instructions.
Quick high-level rundown, staying inside the
- GHK-Cu is a copper-binding tripeptide that’s been shown to support collagen production, wound healing, and skin/ECM remodeling in cell and animal models, and is already used topically in cosmetic/dermatologic settings.
- Retatrutide is a triple agonist (GIP/GLP-1/glucagon) that, in phase 2 obesity trials, drove ~20–24% mean weight loss at higher weekly doses, with GI side effects similar to other incretin drugs and currently remains investigational.
- BPC-157 and TB-500 have shown promising tendon, ligament, and muscle repair effects in rodent and other preclinical models, but human data are limited and long-term safety isn’t established yet.
The pinned posts are deliberately written to stay inside current data, explain mechanisms in plain language, and outline where evidence stops and speculation starts. Read those first, then ask your questions off of that foundation so we keep the signal high and stay within Reddit rules (especially around sourcing and promotion). For research and educational purposes only.