Biologically active peptides are a common ingredient in anti-aging skin creams
GSLs are hydrolysed by enzymes called myrosinases (-thioglucosidases) when they come together upon tissue damage 1,2
BPC-157 works through different mechanisms (NO modulation, growth factor signaling) than these drugs, making pharmacological overlap unlikely
A very recent, 2016 research article compared the topical moisturizing effect of crosslinked HA (not Hylan B gel specifically, but something called Resilient HA or RHA), HMW-HA and LMW-HA and found that "TEWL (that is trans-epidermal water loss, the water that evaporates from the skin) was reduced by 27.8% with RHA, and by 15.6% with HMW HA, but increased by 55.5% with LMW HA." (You can read much more about HMW and LMW HA here in the geeky details section.) All in all, we think Sodium Hyaluronate Crosspolymer is an awesome version of HA , probably superior to traditional versions, so be happy to spot it on the ingredient list