Similarly, astrocytes are recognized to change their shape, behavior, and gene activity in response to injury, disease, or infection in CNS
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Its also used off-label for treatment-resistant depression and narcolepsy
The third on our 3 Different Types of B12 list is Hydroxycobalamin is another form of vitamin B12 that is used in injections to treat vitamin B12 deficiency

Commonly Reported Research Observations Injection-site redness or irritation Temporary swelling or warmth sensation at the administration site Burning or stinging during administration Temporary skin sensitivity or irritation Mild headaches Temporary fatigue or tiredness Mild nausea Temporary itching or flushing sensations Temporary blue-tinted discoloration beneath the administration area in some research settings Copper-Related Research Considerations Because GHK-Cu is a copper-binding peptide, some research protocols may monitor for: Copper- and zinc-balance variability Increased sensitivity in higher-frequency protocols Temporary skin-related response variability Individual differences in antioxidant-response pathways Research involving prolonged or higher-frequency protocols commonly investigates the inclusion of: Zinc supplementation Vitamin C supplementation alongside GHK-Curelated research models