The scalp is actually a reasonably permeable surface compared to other skin areas, especially when you use a vehicle (the carrier liquid) designed for skin penetration
Many people describe early changes within one to two weeks for acute soft-tissue issues, gut-related use is sometimes felt sooner, and chronic injuries can take four to eight weeks or longer
GHK-Cu is a naturally occurring copper-binding tripeptide that your body produces and uses as a repair signal
Still, they point out, there are serious questions about the pros and cons of any therapy that produces sustained elevations of growth hormones, with evidence that it could shorten lifespan
What Does the Evidence Actually Show
The exact absorption rate is hard to predict, but this sustained release should help maintain steadier blood levels of B12