The penetration rationale is borrowed, not AHK-Cu-specific
377(2):153159 Gastric pentadecapeptide body protection compound BPC 157 and its role in accelerating musculoskeletal soft tissue healing Jzwiak M, Bauer M, Kamysz W, Kleczkowska P., Pharmaceuticals (Basel) , 2025
Weng J, Tong HHY, Chow SF (2020) In vitro release study of the polymeric drug nanoparticles: development and validation of a novel method
The mechanistic plausibility is strong (NNMT inhibition increases NAD+ without the gastrointestinal side effects of high-dose nicotinamide), and the short-term tolerability profile is excellent, but we mean this sincerely: if you're using this compound for durations beyond what the published trials covered, you are operating in uncharted territory
Liquid : The liquid form can be mixed into food or water which makes it a flexible option and is useful for dogs that dislike pills