Those allergic to vitamin B12 or cobalt should avoid them
This peptide is the active ingredient in the topical copper peptides that have been sold as cosmetic agents on the dermatology shelf since the late 1980s, with the caveat being that topical GHK-Cu needs to penetrate the stratum corneum layer of skin before getting to the dermis, which houses the receptors for the peptide
They are designed for different goals, and Dr
in vitro and animal studies have linked thymosin beta-4 overexpression to increased tumor size and metastasis in several cancer types (including colorectal and pancreatic cancer), leading researchers to flag a theoretical cancer-promotion risk, particularly for anyone with an active malignancy or recent cancer history Self-reported effects compiled from user and case reports, not controlled trials, include injection-site redness or itching, transient fatigue, and headache
First, is self-injection safe
Instead, this moment reflects a transition: from heightened restriction toward structured re-evaluation