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BPC-157 is a really interesting peptide
https://en.wikipedia.org/wiki/BPC-157
"It has been tested in animal trials for cytoprotective and wound healing activities. BPC-157 can contribute to wound healing due to muscle and tendon rejuvenating properties through accelerating the rate of angiogenic repair."
It is cheap and readily available (on Amazon even!), when injected it appears to greatly accelerate recovery from injuries - it's been called the "Wolverine drug" (as in the x-men character with superhuman healing powers). It requires injection, so its use is most common in bodybuilders who are aren't as averse to injecting questionable substances.
Many stories from people claiming it successfully repaired years-old tendon injuries and such. Some claim that oral administration can help with gut issues as well.
Some select testimonials: Rotator cuff injury recovery - https://www.reddit.com/r/Peptides/comments/8iqbv9/bpc_157_is...
Bicep tendon rupture recovery - https://www.reddit.com/r/powerlifting/comments/5ewi2j/bpc157...
Non-surgical repair of rat achilles tendon - https://www.ncbi.nlm.nih.gov/pubmed/16583442
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Melanotan is another interesting one - it's an injectable peptide that increases melanin in the skin. From the image journals I've seen reporting progress over time, it definitely is highly effective - one individual used for several months and went from a pasty caucasian to looking Indian or almost Black. He decided to discontinue his trial when his friends started making 'blackface' comments.
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I think it's a really exciting area of research, and I'm glad the people willing to take these risks post about it so readily on the /r/Peptides subreddit. Not for me, but I'm glad they're publishing the results of their n=1 studies!