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Published work has described its resistance to degradation in gastric juice across a wide pH range, which is the biological setting of the parent protein

Int J Mol Sci, 21 (3), doi: Dove, K

Two other studies found lower serum BDNF levels among lung cancer 22 and colorectal cancer 23 patients when compared to non-cancer controls

Both promote repair, but through different routes, which is why researchers combine them

GHK-Cu offers a complementary neurotrophic gene-expression angle (BDNF/NGF upregulation, A-copper interaction biology) that is mechanistically distinct and particularly relevant to neurodegeneration research