ghk cu injection site irritation redness itching Why GHK-Cu Injections Sometimes Sting and 5 Ways to Reduce Discomfort Injection Site Itching and Swelling
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The honest answer is that these two ingredients aren't really in competition

These essential B vitamins help fuel your daily wellness by contributing to energy metabolism, nervous system function, and more

[PubMed] [Google Scholar] Martins R, Lithgow GJ, Link W

Most manufacturers, including us, state that unopened vials can be safely stored at controlled room temperature (around 20C to 25C or 68F to 77F)

Expect 4-8 weeks for moderate improvement and 8-16 weeks for significant relief from chronic pain
Pumps are stronger and muscles look fuller