GHK-Cu: GHK-Cu is a copper-bound tripeptide made up of three amino acids: glycine, histidine, and lysine.
GHK is a naturally occurring peptide found in the human body, but when combined with copper ion (Cu), it becomes much more biologically active with an affinity for skin tissue to support collagen production, wound healing, and a healthy inflammatory response [1].
TB-500: A synthetic natural peptide based on a peptide the body already makes called "Thymosin Beta-4" that's involved in the body's processes for wound healing, reducing inflammation, and cellular repair. TB-500 is just a small part of the larger, 43-amino acid profile, and it's designed to be much more stable than its original counterpart.
Just like BPC-157, TB-500 isn't approved by the FDA for human use. So, if you're looking around online for this compound, companies sell it under the "Research Purposes" loophole, typically in a liquid vial that's meant to be injected subcutaneously (under the skin in the fat layer) or intramuscularly (in the muscle).
BPC-157: BPC-157 stands for "body protection compound," consisting of 15-amino-acids from a protein found in gastric juice.
The BPC-157 you buy online is a variation that isn't an exact match to any naturally occurring standalone peptide, and it’s lab-made — so it doesn't come from actual gastric juices — but it's based on a fragment of a real protein.
BPC-157 is a bit tricky to come by because the FDA does not approve it for human use, but many people get around it by buying compounds labeled for "Research Purposes."