Modifying the biological, chemical, and physical properties of these small molecules can improve their release rate, solubility, and stability, distribution, and metabolism in vivo
Gazit N et al
However, if your research protocol explicitly calls for an IM injection, your needle requirements change completely
GHRP-6 and a GHRH analog work on two different receptors , and human studies show the GH response to the two together is larger than to either one alone
I would recommend them if you want to try different methods to relieve pain, however what works for one persons doesnt work for everyone
Professional injections might be a better choice if you value expert oversight and immediate care